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Schedule III Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate And Accumulated Depreciation [Line Items]        
Total $ 13,898,707 $ 13,656,807 $ 13,292,039 $ 12,972,170
Accumulated Depreciation (2,955,253) $ (2,549,287) $ (2,075,071) $ (1,674,801)
Total Retail/Commercial Properties        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost Land 32,349      
Initial Cost Buildings and Fixtures 170,859      
Gross Amount, Land 33,266      
Gross Amount, Buildings and Fixtures 195,410      
Total [1] 228,676      
Accumulated Depreciation [2] (27,506)      
Net 201,170      
Total Retail/Commercial Properties | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition 917      
Total Retail/Commercial Properties | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition 24,551      
Total Real Estate Assets Net Of Joint        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 145,473      
Initial Cost Land 1,934,102      
Initial Cost Buildings and Fixtures 10,112,798      
Gross Amount, Land 1,940,305      
Gross Amount, Buildings and Fixtures 11,958,402      
Total [1] 13,898,707      
Accumulated Depreciation [2] (2,955,253)      
Net 10,943,454      
Total Real Estate Assets Net Of Joint | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition 6,203      
Total Real Estate Assets Net Of Joint | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,845,604      
Wholly Owned Properties - Residential | Birchall At Ross Bridge        
Real Estate And Accumulated Depreciation [Line Items]        
Location Birmingham, AL      
Initial Cost Land $ 2,640      
Initial Cost Buildings and Fixtures 28,842      
Gross Amount, Land 2,640      
Gross Amount, Buildings and Fixtures 30,983      
Total [1] 33,623      
Accumulated Depreciation [2] (8,991)      
Net $ 24,632      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2011      
Wholly Owned Properties - Residential | Birchall At Ross Bridge | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,141      
Wholly Owned Properties - Residential | Colonial Grand At Riverchase Trails        
Real Estate And Accumulated Depreciation [Line Items]        
Location Birmingham, AL      
Initial Cost Land $ 3,761      
Initial Cost Buildings and Fixtures 22,079      
Gross Amount, Land 3,761      
Gross Amount, Buildings and Fixtures 26,640      
Total [1] 30,401      
Accumulated Depreciation [2] (8,107)      
Net $ 22,294      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2010      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Riverchase Trails | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,561      
Wholly Owned Properties - Residential | Colonial Village At Trussville        
Real Estate And Accumulated Depreciation [Line Items]        
Location Birmingham, AL      
Initial Cost Land $ 3,402      
Initial Cost Buildings and Fixtures 31,813      
Gross Amount, Land 3,402      
Gross Amount, Buildings and Fixtures 35,100      
Total [1] 38,502      
Accumulated Depreciation [2] (9,866)      
Net $ 28,636      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Trussville | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
Wholly Owned Properties - Residential | Colonial Village At Trussville | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
Wholly Owned Properties - Residential | Colonial Village At Trussville | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,287      
Wholly Owned Properties - Residential | Eagle Ridge        
Real Estate And Accumulated Depreciation [Line Items]        
Location Birmingham, AL      
Initial Cost Land $ 851      
Initial Cost Buildings and Fixtures 7,667      
Gross Amount, Land 851      
Gross Amount, Buildings and Fixtures 12,403      
Total [1] 13,254      
Accumulated Depreciation [2] (8,302)      
Net $ 4,952      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1986      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1998      
Wholly Owned Properties - Residential | Eagle Ridge | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,736      
Wholly Owned Properties - Residential | Colonial Grand At Traditions        
Real Estate And Accumulated Depreciation [Line Items]        
Location Gulf Shores,AL      
Initial Cost Land $ 3,211      
Initial Cost Buildings and Fixtures 25,162      
Gross Amount, Land 3,211      
Gross Amount, Buildings and Fixtures 28,037      
Total [1] 31,248      
Accumulated Depreciation [2] (8,408)      
Net $ 22,840      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2007      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Traditions | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,875      
Wholly Owned Properties - Residential | Colonial Grand At Edgewater        
Real Estate And Accumulated Depreciation [Line Items]        
Location Huntsville, AL      
Initial Cost Land $ 4,943      
Initial Cost Buildings and Fixtures 38,673      
Gross Amount, Land 4,943      
Gross Amount, Buildings and Fixtures 45,161      
Total [1] 50,104      
Accumulated Depreciation [2] (11,276)      
Net $ 38,828      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1990      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Edgewater | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,488      
Wholly Owned Properties - Residential | Paddock Clubat Providence        
Real Estate And Accumulated Depreciation [Line Items]        
Location Huntsville, AL      
Initial Cost Land $ 909      
Initial Cost Buildings and Fixtures 10,152      
Gross Amount, Land 1,739      
Gross Amount, Buildings and Fixtures 24,735      
Total [1] 26,474      
Accumulated Depreciation [2] (15,146)      
Net $ 11,328      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1993      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1997      
Wholly Owned Properties - Residential | Paddock Clubat Providence | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 830      
Wholly Owned Properties - Residential | Paddock Clubat Providence | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 14,583      
Wholly Owned Properties - Residential | Colonial Grand At Madison        
Real Estate And Accumulated Depreciation [Line Items]        
Location Madison, AL      
Initial Cost Land $ 3,601      
Initial Cost Buildings and Fixtures 28,934      
Gross Amount, Land 3,601      
Gross Amount, Buildings and Fixtures 30,783      
Total [1] 34,384      
Accumulated Depreciation [2] (8,864)      
Net $ 25,520      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Madison | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,849      
Wholly Owned Properties - Residential | Cypress Village        
Real Estate And Accumulated Depreciation [Line Items]        
Location Orange Beach, AL      
Initial Cost Land $ 1,290      
Initial Cost Buildings and Fixtures 12,238      
Gross Amount, Land 1,290      
Gross Amount, Buildings and Fixtures 14,255      
Total [1] 15,545      
Accumulated Depreciation [2] (3,746)      
Net $ 11,799      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Cypress Village | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,017      
Wholly Owned Properties - Residential | Colonial Grand At Liberty Park        
Real Estate And Accumulated Depreciation [Line Items]        
Location Vestavia Hills, AL      
Initial Cost Land $ 3,922      
Initial Cost Buildings and Fixtures 30,977      
Gross Amount, Land 3,922      
Gross Amount, Buildings and Fixtures 36,923      
Total [1] 40,845      
Accumulated Depreciation [2] (10,703)      
Net $ 30,142      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Liberty Park | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,946      
Wholly Owned Properties - Residential | Edge At Lyons Gate        
Real Estate And Accumulated Depreciation [Line Items]        
Location Phoenix, AZ      
Initial Cost Land $ 7,901      
Initial Cost Buildings and Fixtures 27,182      
Gross Amount, Land 7,901      
Gross Amount, Buildings and Fixtures 30,078      
Total [1] 37,979      
Accumulated Depreciation [2] (11,872)      
Net $ 26,107      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2007      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2008      
Wholly Owned Properties - Residential | Edge At Lyons Gate | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,896      
Wholly Owned Properties - Residential | Residencesat Fountainhead        
Real Estate And Accumulated Depreciation [Line Items]        
Location Phoenix, AZ      
Initial Cost Land $ 12,212      
Initial Cost Buildings and Fixtures 56,705      
Gross Amount, Land 12,212      
Gross Amount, Buildings and Fixtures 57,837      
Total [1] 70,049      
Accumulated Depreciation [2] (6,366)      
Net $ 63,683      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2015      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Residencesat Fountainhead | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,132      
Wholly Owned Properties - Residential | Sky View Ranch        
Real Estate And Accumulated Depreciation [Line Items]        
Location Gilbert, AZ      
Initial Cost Land $ 2,668      
Initial Cost Buildings and Fixtures 14,577      
Gross Amount, Land 2,668      
Gross Amount, Buildings and Fixtures 17,086      
Total [1] 19,754      
Accumulated Depreciation [2] (6,531)      
Net $ 13,223      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2007      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2009      
Wholly Owned Properties - Residential | Sky View Ranch | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,509      
Wholly Owned Properties - Residential | Talus Ranch        
Real Estate And Accumulated Depreciation [Line Items]        
Location Phoenix, AZ      
Initial Cost Land $ 12,741      
Initial Cost Buildings and Fixtures 47,701      
Gross Amount, Land 12,741      
Gross Amount, Buildings and Fixtures 51,759      
Total [1] 64,500      
Accumulated Depreciation [2] (22,976)      
Net $ 41,524      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2005      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2006      
Wholly Owned Properties - Residential | Talus Ranch | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,058      
Wholly Owned Properties - Residential | Colonial Grand At Inverness Commons        
Real Estate And Accumulated Depreciation [Line Items]        
Location Mesa, AZ      
Initial Cost Land $ 4,219      
Initial Cost Buildings and Fixtures 26,255      
Gross Amount, Land 4,219      
Gross Amount, Buildings and Fixtures 28,598      
Total [1] 32,817      
Accumulated Depreciation [2] (7,720)      
Net $ 25,097      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2002      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Inverness Commons | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,343      
Wholly Owned Properties - Residential | Colonial Grand At Scottsdale        
Real Estate And Accumulated Depreciation [Line Items]        
Location Scottsdale, AZ      
Initial Cost Land $ 3,612      
Initial Cost Buildings and Fixtures 20,273      
Gross Amount, Land 3,612      
Gross Amount, Buildings and Fixtures 22,763      
Total [1] 26,375      
Accumulated Depreciation [2] (6,313)      
Net $ 20,062      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Scottsdale | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,490      
Wholly Owned Properties - Residential | Colonial Grandat Old Town Scottsdale        
Real Estate And Accumulated Depreciation [Line Items]        
Location Scottsdale, AZ      
Initial Cost Land $ 7,820      
Initial Cost Buildings and Fixtures 51,627      
Gross Amount, Land 7,820      
Gross Amount, Buildings and Fixtures 56,860      
Total [1] 64,680      
Accumulated Depreciation [2] (15,311)      
Net $ 49,369      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grandat Old Town Scottsdale | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1994      
Wholly Owned Properties - Residential | Colonial Grandat Old Town Scottsdale | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1995      
Wholly Owned Properties - Residential | Colonial Grandat Old Town Scottsdale | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,233      
Wholly Owned Properties - Residential | Sky Song        
Real Estate And Accumulated Depreciation [Line Items]        
Location Scottsdale, AZ      
Initial Cost Buildings and Fixtures $ 55,748      
Gross Amount, Buildings and Fixtures 57,890      
Total [1] 57,890      
Accumulated Depreciation [2] (7,075)      
Net $ 50,815      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2014      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2015      
Wholly Owned Properties - Residential | Sky Song | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,142      
Wholly Owned Properties - Residential | Sync36 I        
Real Estate And Accumulated Depreciation [Line Items]        
Location Denver, CO      
Initial Cost Land $ 18,887      
Initial Cost Buildings and Fixtures 81,317      
Gross Amount, Land 19,021      
Gross Amount, Buildings and Fixtures 85,942      
Total [1] 104,963      
Accumulated Depreciation [2] (4,201)      
Net $ 100,762      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2017      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2018      
Wholly Owned Properties - Residential | Sync36 I | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 134      
Wholly Owned Properties - Residential | Sync36 I | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,625      
Wholly Owned Properties - Residential | Sync36 I I        
Real Estate And Accumulated Depreciation [Line Items]        
Location Denver, CO      
Initial Cost Land $ 5,090      
Gross Amount, Land 5,090      
Gross Amount, Buildings and Fixtures 16,726      
Total [1] 21,816      
Accumulated Depreciation [2] (228)      
Net $ 21,588      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2019      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2018      
Wholly Owned Properties - Residential | Sync36 I I | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 16,726      
Wholly Owned Properties - Residential | Post River North [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Denver, CO      
Initial Cost Land $ 14,500      
Initial Cost Buildings and Fixtures 28,900      
Gross Amount, Land 14,500      
Gross Amount, Buildings and Fixtures 73,049      
Total [1] 87,549      
Accumulated Depreciation [2] (5,147)      
Net $ 82,402      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2018      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post River North [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 44,149      
Wholly Owned Properties - Residential | Tiffany Oaks        
Real Estate And Accumulated Depreciation [Line Items]        
Location Altamonte Springs, FL      
Initial Cost Land $ 1,024      
Initial Cost Buildings and Fixtures 9,219      
Gross Amount, Land 1,024      
Gross Amount, Buildings and Fixtures 14,945      
Total [1] 15,969      
Accumulated Depreciation [2] (10,732)      
Net $ 5,237      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1985      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1996      
Wholly Owned Properties - Residential | Tiffany Oaks | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,726      
Wholly Owned Properties - Residential | Indigo Point        
Real Estate And Accumulated Depreciation [Line Items]        
Location Brandon, FL      
Initial Cost Land $ 1,167      
Initial Cost Buildings and Fixtures 10,500      
Gross Amount, Land 1,167      
Gross Amount, Buildings and Fixtures 14,823      
Total [1] 15,990      
Accumulated Depreciation [2] (9,602)      
Net $ 6,388      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1989      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2000      
Wholly Owned Properties - Residential | Indigo Point | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,323      
Wholly Owned Properties - Residential | Paddock Club Brandon        
Real Estate And Accumulated Depreciation [Line Items]        
Location Brandon, FL      
Initial Cost Land $ 2,896      
Initial Cost Buildings and Fixtures 26,111      
Gross Amount, Land 2,896      
Gross Amount, Buildings and Fixtures 32,976      
Total [1] 35,872      
Accumulated Depreciation [2] (21,933)      
Net $ 13,939      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1997      
Wholly Owned Properties - Residential | Paddock Club Brandon | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,865      
Wholly Owned Properties - Residential | Colonial Grand At Lakewood Ranch        
Real Estate And Accumulated Depreciation [Line Items]        
Location Bradenton, FL      
Initial Cost Land $ 2,980      
Initial Cost Buildings and Fixtures 40,230      
Gross Amount, Land 2,980      
Gross Amount, Buildings and Fixtures 44,464      
Total [1] 47,444      
Accumulated Depreciation [2] (11,937)      
Net $ 35,507      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Lakewood Ranch | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,234      
Wholly Owned Properties - Residential | Preserve At Coral Square        
Real Estate And Accumulated Depreciation [Line Items]        
Location Coral Springs, FL      
Initial Cost Land $ 9,600      
Initial Cost Buildings and Fixtures 40,004      
Gross Amount, Land 9,600      
Gross Amount, Buildings and Fixtures 51,577      
Total [1] 61,177      
Accumulated Depreciation [2] (26,530)      
Net $ 34,647      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2004      
Wholly Owned Properties - Residential | Preserve At Coral Square | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 11,573      
Wholly Owned Properties - Residential | Paddock Club Gainesville        
Real Estate And Accumulated Depreciation [Line Items]        
Location Gainesville, FL      
Initial Cost Land $ 1,800      
Initial Cost Buildings and Fixtures 15,879      
Gross Amount, Land 1,800      
Gross Amount, Buildings and Fixtures 21,000      
Total [1] 22,800      
Accumulated Depreciation [2] (10,970)      
Net $ 11,830      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1998      
Wholly Owned Properties - Residential | Paddock Club Gainesville | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,121      
Wholly Owned Properties - Residential | Retreat At Magnolia Park        
Real Estate And Accumulated Depreciation [Line Items]        
Location Gainesville, FL      
Initial Cost Land $ 2,040      
Initial Cost Buildings and Fixtures 16,338      
Gross Amount, Land 2,040      
Gross Amount, Buildings and Fixtures 17,325      
Total [1] 19,365      
Accumulated Depreciation [2] (5,221)      
Net $ 14,144      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2011      
Wholly Owned Properties - Residential | Retreat At Magnolia Park | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 987      
Wholly Owned Properties - Residential | Colonial Grand At Heathrow        
Real Estate And Accumulated Depreciation [Line Items]        
Location Heathrow, FL      
Initial Cost Land $ 4,101      
Initial Cost Buildings and Fixtures 35,684      
Gross Amount, Land 4,101      
Gross Amount, Buildings and Fixtures 39,737      
Total [1] 43,838      
Accumulated Depreciation [2] (11,024)      
Net $ 32,814      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Heathrow | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,053      
Wholly Owned Properties - Residential | A220 Riverside        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jacksonville, FL      
Initial Cost Land $ 2,381      
Initial Cost Buildings and Fixtures 35,514      
Gross Amount, Land 2,381      
Gross Amount, Buildings and Fixtures 43,236      
Total [1] 45,617      
Accumulated Depreciation [2] (4,666)      
Net $ 40,951      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2015      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2012      
Wholly Owned Properties - Residential | A220 Riverside | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 7,722      
Wholly Owned Properties - Residential | Atlantic Crossing        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jacksonville, FL      
Initial Cost Land $ 4,000      
Initial Cost Buildings and Fixtures 19,495      
Gross Amount, Land 4,000      
Gross Amount, Buildings and Fixtures 21,436      
Total [1] 25,436      
Accumulated Depreciation [2] (6,580)      
Net $ 18,856      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2011      
Wholly Owned Properties - Residential | Atlantic Crossing | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,941      
Wholly Owned Properties - Residential | Coopers Hawk        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jacksonville, FL      
Initial Cost Land $ 854      
Initial Cost Buildings and Fixtures 7,500      
Gross Amount, Land 854      
Gross Amount, Buildings and Fixtures 11,423      
Total [1] 12,277      
Accumulated Depreciation [2] (8,666)      
Net $ 3,611      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1987      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1995      
Wholly Owned Properties - Residential | Coopers Hawk | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,923      
Wholly Owned Properties - Residential | Hunters Ridge At Deerwood        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jacksonville, FL      
Initial Cost Land $ 1,533      
Initial Cost Buildings and Fixtures 13,835      
Gross Amount, Land 1,533      
Gross Amount, Buildings and Fixtures 19,455      
Total [1] 20,988      
Accumulated Depreciation [2] (13,462)      
Net $ 7,526      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1987      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1997      
Wholly Owned Properties - Residential | Hunters Ridge At Deerwood | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,620      
Wholly Owned Properties - Residential | Lakeside        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jacksonville, FL      
Initial Cost Land $ 1,430      
Initial Cost Buildings and Fixtures 12,883      
Gross Amount, Land 1,430      
Gross Amount, Buildings and Fixtures 21,708      
Total [1] 23,138      
Accumulated Depreciation [2] (16,048)      
Net $ 7,090      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1985      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1996      
Wholly Owned Properties - Residential | Lakeside | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 8,825      
Wholly Owned Properties - Residential | Lighthouse At Fleming Island        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jacksonville, FL      
Initial Cost Land $ 4,047      
Initial Cost Buildings and Fixtures 35,052      
Gross Amount, Land 4,047      
Gross Amount, Buildings and Fixtures 40,766      
Total [1] 44,813      
Accumulated Depreciation [2] (22,455)      
Net $ 22,358      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2003      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2003      
Wholly Owned Properties - Residential | Lighthouse At Fleming Island | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,714      
Wholly Owned Properties - Residential | Paddock Club Mandarin        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jacksonville, FL      
Initial Cost Land $ 1,411      
Initial Cost Buildings and Fixtures 14,967      
Gross Amount, Land 1,411      
Gross Amount, Buildings and Fixtures 18,187      
Total [1] 19,598      
Accumulated Depreciation [2] (9,988)      
Net $ 9,610      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1998      
Wholly Owned Properties - Residential | Paddock Club Mandarin | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,220      
Wholly Owned Properties - Residential | St Augustine        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jacksonville, FL      
Initial Cost Land $ 2,857      
Initial Cost Buildings and Fixtures 6,475      
Gross Amount, Land 2,857      
Gross Amount, Buildings and Fixtures 26,138      
Total [1] 28,995      
Accumulated Depreciation [2] (13,342)      
Net $ 15,653      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1995      
Wholly Owned Properties - Residential | St Augustine | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1987      
Wholly Owned Properties - Residential | St Augustine | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
Wholly Owned Properties - Residential | St Augustine | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 19,663      
Wholly Owned Properties - Residential | Tattersall At Tapestry Park        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jacksonville, FL      
Initial Cost Land $ 6,417      
Initial Cost Buildings and Fixtures 36,069      
Gross Amount, Land 6,417      
Gross Amount, Buildings and Fixtures 37,590      
Total [1] 44,007      
Accumulated Depreciation [2] (11,060)      
Net $ 32,947      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2011      
Wholly Owned Properties - Residential | Tattersall At Tapestry Park | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,521      
Wholly Owned Properties - Residential | Woodhollow        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jacksonville, FL      
Initial Cost Land $ 1,686      
Initial Cost Buildings and Fixtures 15,179      
Gross Amount, Land 1,678      
Gross Amount, Buildings and Fixtures 24,597      
Total [1] 26,275      
Accumulated Depreciation [2] (17,793)      
Net $ 8,482      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1986      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1997      
Wholly Owned Properties - Residential | Woodhollow | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ (8)      
Wholly Owned Properties - Residential | Woodhollow | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 9,418      
Wholly Owned Properties - Residential | Colonial Grand At Town Park        
Real Estate And Accumulated Depreciation [Line Items]        
Location Lake Mary, FL      
Initial Cost Land $ 5,742      
Initial Cost Buildings and Fixtures 56,562      
Gross Amount, Land 5,742      
Gross Amount, Buildings and Fixtures 62,167      
Total [1] 67,909      
Accumulated Depreciation [2] (17,694)      
Net $ 50,215      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2005      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Town Park | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,605      
Wholly Owned Properties - Residential | Colonial Grand At Town Park Reserve        
Real Estate And Accumulated Depreciation [Line Items]        
Location Lake Mary, FL      
Initial Cost Land $ 3,481      
Initial Cost Buildings and Fixtures 10,311      
Gross Amount, Land 3,481      
Gross Amount, Buildings and Fixtures 10,749      
Total [1] 14,230      
Accumulated Depreciation [2] (3,150)      
Net $ 11,080      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2004      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Town Park Reserve | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 438      
Wholly Owned Properties - Residential | Colonial Grandat Lake Mary        
Real Estate And Accumulated Depreciation [Line Items]        
Location Lake Mary, FL      
Initial Cost Land $ 6,346      
Initial Cost Buildings and Fixtures 41,539      
Gross Amount, Land 6,346      
Gross Amount, Buildings and Fixtures 65,159      
Total [1] 71,505      
Accumulated Depreciation [2] (14,085)      
Net $ 57,420      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2012      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grandat Lake Mary | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 23,620      
Wholly Owned Properties - Residential | Colonial Grand At Randal Lakes        
Real Estate And Accumulated Depreciation [Line Items]        
Location Orlando, FL      
Initial Cost Land $ 5,659      
Initial Cost Buildings and Fixtures 50,553      
Gross Amount, Land 5,659      
Gross Amount, Buildings and Fixtures 61,689      
Total [1] 67,348      
Accumulated Depreciation [2] (9,287)      
Net $ 58,061      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Randal Lakes | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 11,136      
Wholly Owned Properties - Residential | Colonial Grandat Randal Lakes I I        
Real Estate And Accumulated Depreciation [Line Items]        
Location Orlando, FL      
Initial Cost Land $ 3,200      
Gross Amount, Land 3,200      
Gross Amount, Buildings and Fixtures 36,854      
Total [1] 40,054      
Accumulated Depreciation [2] (2,837)      
Net $ 37,217      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grandat Randal Lakes I I | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 36,854      
Wholly Owned Properties - Residential | Retreat At Lake Nona        
Real Estate And Accumulated Depreciation [Line Items]        
Location Orlando, FL      
Initial Cost Land $ 7,880      
Initial Cost Buildings and Fixtures 41,175      
Gross Amount, Land 7,880      
Gross Amount, Buildings and Fixtures 46,792      
Total [1] 54,672      
Accumulated Depreciation [2] (12,331)      
Net $ 42,341      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2006      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2012      
Wholly Owned Properties - Residential | Retreat At Lake Nona | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,617      
Wholly Owned Properties - Residential | Colonial Grand At Heather Glen        
Real Estate And Accumulated Depreciation [Line Items]        
Location Orlando, FL      
Initial Cost Land $ 4,662      
Initial Cost Buildings and Fixtures 56,988      
Gross Amount, Land 4,662      
Gross Amount, Buildings and Fixtures 63,470      
Total [1] 68,132      
Accumulated Depreciation [2] (16,941)      
Net $ 51,191      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Heather Glen | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,482      
Wholly Owned Properties - Residential | Post Lakeat Baldwin Park        
Real Estate And Accumulated Depreciation [Line Items]        
Location Orlando, FL      
Initial Cost Land $ 18,101      
Initial Cost Buildings and Fixtures 144,200      
Gross Amount, Land 18,101      
Gross Amount, Buildings and Fixtures 146,928      
Total [1] 165,029      
Accumulated Depreciation [2] (18,240)      
Net $ 146,789      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2011      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Lakeat Baldwin Park | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,728      
Wholly Owned Properties - Residential | Post Lakeside        
Real Estate And Accumulated Depreciation [Line Items]        
Location Orlando, FL      
Initial Cost Land $ 7,046      
Initial Cost Buildings and Fixtures 52,585      
Gross Amount, Land 7,046      
Gross Amount, Buildings and Fixtures 53,298      
Total [1] 60,344      
Accumulated Depreciation [2] (6,058)      
Net $ 54,286      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Lakeside | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 713      
Wholly Owned Properties - Residential | Post Parkside Orlando        
Real Estate And Accumulated Depreciation [Line Items]        
Location Orlando, FL      
Initial Cost Land $ 5,669      
Initial Cost Buildings and Fixtures 49,754      
Gross Amount, Land 5,669      
Gross Amount, Buildings and Fixtures 52,801      
Total [1] 58,470      
Accumulated Depreciation [2] (6,651)      
Net $ 51,819      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Parkside Orlando | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,047      
Wholly Owned Properties - Residential | Park Crest At Innisbrook        
Real Estate And Accumulated Depreciation [Line Items]        
Location Palm Harbor, FL      
Encumbrances $ 25,777      
Initial Cost Land 6,900      
Initial Cost Buildings and Fixtures 26,613      
Gross Amount, Land 6,900      
Gross Amount, Buildings and Fixtures 30,181      
Total [1] 37,081      
Accumulated Depreciation [2] (11,639)      
Net $ 25,442      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2009      
Wholly Owned Properties - Residential | Park Crest At Innisbrook | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,568      
Wholly Owned Properties - Residential | Club At Panama Beach        
Real Estate And Accumulated Depreciation [Line Items]        
Location Panama City, FL      
Initial Cost Land $ 898      
Initial Cost Buildings and Fixtures 14,276      
Gross Amount, Land 893      
Gross Amount, Buildings and Fixtures 18,892      
Total [1] 19,785      
Accumulated Depreciation [2] (10,754)      
Net $ 9,031      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1998      
Wholly Owned Properties - Residential | Club At Panama Beach | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ (5)      
Wholly Owned Properties - Residential | Club At Panama Beach | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,616      
Wholly Owned Properties - Residential | Colonial Village At Twin Lakes        
Real Estate And Accumulated Depreciation [Line Items]        
Location Sanford, FL      
Encumbrances $ 22,286      
Initial Cost Land 3,091      
Initial Cost Buildings and Fixtures 47,793      
Gross Amount, Land 3,091      
Gross Amount, Buildings and Fixtures 50,547      
Total [1] 53,638      
Accumulated Depreciation [2] (13,761)      
Net $ 39,877      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2005      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Twin Lakes | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,754      
Wholly Owned Properties - Residential | Paddock Club Tallahassee        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tallahassee, FL      
Initial Cost Land $ 530      
Initial Cost Buildings and Fixtures 4,805      
Gross Amount, Land 1,480      
Gross Amount, Buildings and Fixtures 19,570      
Total [1] 21,050      
Accumulated Depreciation [2] (13,777)      
Net $ 7,273      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1992      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1997      
Wholly Owned Properties - Residential | Paddock Club Tallahassee | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 950      
Wholly Owned Properties - Residential | Paddock Club Tallahassee | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 14,765      
Wholly Owned Properties - Residential | Verandasat Southwood        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tallahassee, FL      
Initial Cost Land $ 3,600      
Initial Cost Buildings and Fixtures 25,914      
Gross Amount, Land 3,600      
Gross Amount, Buildings and Fixtures 27,275      
Total [1] 30,875      
Accumulated Depreciation [2] (5,341)      
Net $ 25,534      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2003      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2011      
Wholly Owned Properties - Residential | Verandasat Southwood | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,361      
Wholly Owned Properties - Residential | Belmere        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tampa, FL      
Initial Cost Land $ 852      
Initial Cost Buildings and Fixtures 7,667      
Gross Amount, Land 852      
Gross Amount, Buildings and Fixtures 15,109      
Total [1] 15,961      
Accumulated Depreciation [2] (10,861)      
Net $ 5,100      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1984      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | Belmere | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 7,442      
Wholly Owned Properties - Residential | Links At Carrollwood        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tampa, FL      
Initial Cost Land $ 817      
Initial Cost Buildings and Fixtures 7,355      
Gross Amount, Land 927      
Gross Amount, Buildings and Fixtures 13,251      
Total [1] 14,178      
Accumulated Depreciation [2] (8,978)      
Net $ 5,200      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1980      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1998      
Wholly Owned Properties - Residential | Links At Carrollwood | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 110      
Wholly Owned Properties - Residential | Links At Carrollwood | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,896      
Wholly Owned Properties - Residential | Post Bayat Rocky Point        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tampa, FL      
Initial Cost Land $ 4,541      
Initial Cost Buildings and Fixtures 28,381      
Gross Amount, Land 4,541      
Gross Amount, Buildings and Fixtures 29,923      
Total [1] 34,464      
Accumulated Depreciation [2] (3,648)      
Net $ 30,816      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Bayat Rocky Point | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,542      
Wholly Owned Properties - Residential | Post Harbour Place        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tampa, FL      
Initial Cost Land $ 16,296      
Initial Cost Buildings and Fixtures 116,193      
Gross Amount, Land 16,296      
Gross Amount, Buildings and Fixtures 124,338      
Total [1] 140,634      
Accumulated Depreciation [2] (15,944)      
Net $ 124,690      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Harbour Place | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 8,145      
Wholly Owned Properties - Residential | Post Hyde Park        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tampa, FL      
Initial Cost Land $ 16,891      
Initial Cost Buildings and Fixtures 95,259      
Gross Amount, Land 16,891      
Gross Amount, Buildings and Fixtures 100,504      
Total [1] 117,395      
Accumulated Depreciation [2] (12,853)      
Net $ 104,542      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1994      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Hyde Park | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,245      
Wholly Owned Properties - Residential | Post Rocky Point        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tampa, FL      
Initial Cost Land $ 35,260      
Initial Cost Buildings and Fixtures 153,102      
Gross Amount, Land 35,260      
Gross Amount, Buildings and Fixtures 164,761      
Total [1] 200,021      
Accumulated Depreciation [2] (20,256)      
Net $ 179,765      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Rocky Point | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1994      
Wholly Owned Properties - Residential | Post Rocky Point | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
Wholly Owned Properties - Residential | Post Rocky Point | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 11,659      
Wholly Owned Properties - Residential | Post Soho Square        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tampa, FL      
Initial Cost Land $ 5,190      
Initial Cost Buildings and Fixtures 56,296      
Gross Amount, Land 5,190      
Gross Amount, Buildings and Fixtures 56,714      
Total [1] 61,904      
Accumulated Depreciation [2] (6,384)      
Net $ 55,520      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2012      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Soho Square | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 418      
Wholly Owned Properties - Residential | Village Oaks        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tampa, FL      
Initial Cost Land $ 2,738      
Initial Cost Buildings and Fixtures 19,055      
Gross Amount, Land 2,891      
Gross Amount, Buildings and Fixtures 21,982      
Total [1] 24,873      
Accumulated Depreciation [2] (8,554)      
Net $ 16,319      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2005      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2008      
Wholly Owned Properties - Residential | Village Oaks | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 153      
Wholly Owned Properties - Residential | Village Oaks | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,927      
Wholly Owned Properties - Residential | Colonial Grand At Hampton Preserve Tampa Fl        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tampa, FL      
Initial Cost Land $ 6,233      
Initial Cost Buildings and Fixtures 69,535      
Gross Amount, Land 6,233      
Gross Amount, Buildings and Fixtures 71,387      
Total [1] 77,620      
Accumulated Depreciation [2] (18,041)      
Net $ 59,579      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2012      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Hampton Preserve Tampa Fl | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,852      
Wholly Owned Properties - Residential | Colonial Grand At Seven Oaks Member        
Real Estate And Accumulated Depreciation [Line Items]        
Location Wesley Chapel, FL      
Initial Cost Land $ 3,051      
Initial Cost Buildings and Fixtures 42,768      
Gross Amount, Land 3,051      
Gross Amount, Buildings and Fixtures 45,686      
Total [1] 48,737      
Accumulated Depreciation [2] (11,929)      
Net $ 36,808      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2004      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Seven Oaks Member | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,918      
Wholly Owned Properties - Residential | Colonial Grand At Windermere Member        
Real Estate And Accumulated Depreciation [Line Items]        
Location Windermere, FL      
Initial Cost Land $ 2,711      
Initial Cost Buildings and Fixtures 36,710      
Gross Amount, Land 2,711      
Gross Amount, Buildings and Fixtures 38,232      
Total [1] 40,943      
Accumulated Depreciation [2] (9,579)      
Net $ 31,364      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Windermere Member | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,522      
Wholly Owned Properties - Residential | Allure At Brookwood Member        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 11,168      
Initial Cost Buildings and Fixtures 52,758      
Gross Amount, Land 11,168      
Gross Amount, Buildings and Fixtures 58,053      
Total [1] 69,221      
Accumulated Depreciation [2] (15,536)      
Net $ 53,685      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2012      
Wholly Owned Properties - Residential | Allure At Brookwood Member | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,295      
Wholly Owned Properties - Residential | Allure In Buckhead Village Member        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 8,633      
Initial Cost Buildings and Fixtures 19,844      
Gross Amount, Land 8,633      
Gross Amount, Buildings and Fixtures 27,168      
Total [1] 35,801      
Accumulated Depreciation [2] (8,418)      
Net $ 27,383      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2002      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2012      
Wholly Owned Properties - Residential | Allure In Buckhead Village Member | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 7,324      
Wholly Owned Properties - Residential | The High Rise At Post Alexander Member        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 8,435      
Initial Cost Buildings and Fixtures 92,294      
Gross Amount, Land 8,435      
Gross Amount, Buildings and Fixtures 92,445      
Total [1] 100,880      
Accumulated Depreciation [2] (15,186)      
Net $ 85,694      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2015      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | The High Rise At Post Alexander Member | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 151      
Wholly Owned Properties - Residential | Post Alexander [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 15,440      
Initial Cost Buildings and Fixtures 73,278      
Gross Amount, Land 15,440      
Gross Amount, Buildings and Fixtures 75,558      
Total [1] 90,998      
Accumulated Depreciation [2] (7,470)      
Net $ 83,528      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2006      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Alexander [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,280      
Wholly Owned Properties - Residential | Post Briarcliff [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 24,645      
Initial Cost Buildings and Fixtures 114,921      
Gross Amount, Land 24,645      
Gross Amount, Buildings and Fixtures 119,059      
Total [1] 143,704      
Accumulated Depreciation [2] (14,258)      
Net $ 129,446      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Briarcliff [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,138      
Wholly Owned Properties - Residential | Post Brookhaven [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 29,048      
Initial Cost Buildings and Fixtures 106,463      
Gross Amount, Land 29,048      
Gross Amount, Buildings and Fixtures 114,402      
Total [1] 143,450      
Accumulated Depreciation [2] (14,588)      
Net $ 128,862      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Brookhaven [Member] | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1989      
Wholly Owned Properties - Residential | Post Brookhaven [Member] | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1992      
Wholly Owned Properties - Residential | Post Brookhaven [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 7,939      
Wholly Owned Properties - Residential | Post Chastain [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 30,223      
Initial Cost Buildings and Fixtures 82,964      
Gross Amount, Land 30,223      
Gross Amount, Buildings and Fixtures 85,296      
Total [1] 115,519      
Accumulated Depreciation [2] (10,162)      
Net $ 105,357      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1990      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Chastain [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,332      
Wholly Owned Properties - Residential | Post Crossing [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 15,799      
Initial Cost Buildings and Fixtures 48,054      
Gross Amount, Land 15,799      
Gross Amount, Buildings and Fixtures 51,292      
Total [1] 67,091      
Accumulated Depreciation [2] (6,284)      
Net $ 60,807      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1995      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Crossing [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,238      
Wholly Owned Properties - Residential | Post Gardens [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 17,907      
Initial Cost Buildings and Fixtures 56,093      
Gross Amount, Land 17,907      
Gross Amount, Buildings and Fixtures 59,509      
Total [1] 77,416      
Accumulated Depreciation [2] (7,713)      
Net $ 69,703      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Gardens [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,416      
Wholly Owned Properties - Residential | Post Glen [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 13,878      
Initial Cost Buildings and Fixtures 51,079      
Gross Amount, Land 13,878      
Gross Amount, Buildings and Fixtures 55,407      
Total [1] 69,285      
Accumulated Depreciation [2] (6,734)      
Net $ 62,551      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Glen [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,328      
Wholly Owned Properties - Residential | Post Midtown [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 7,000      
Initial Cost Buildings and Fixtures 44,000      
Gross Amount, Land 7,000      
Gross Amount, Buildings and Fixtures 84,268      
Total [1] 91,268      
Accumulated Depreciation [2] (5,611)      
Net $ 85,657      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2017      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Midtown [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 40,268      
Wholly Owned Properties - Residential | Post Peachtree Hills [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 11,974      
Initial Cost Buildings and Fixtures 55,264      
Gross Amount, Land 11,974      
Gross Amount, Buildings and Fixtures 55,884      
Total [1] 67,858      
Accumulated Depreciation [2] (6,503)      
Net $ 61,355      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Peachtree Hills [Member] | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1992      
Wholly Owned Properties - Residential | Post Peachtree Hills [Member] | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1994      
Wholly Owned Properties - Residential | Post Peachtree Hills [Member] | Phase III [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
Wholly Owned Properties - Residential | Post Peachtree Hills [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 620      
Wholly Owned Properties - Residential | Post Riverside [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 23,765      
Initial Cost Buildings and Fixtures 89,369      
Gross Amount, Land 23,765      
Gross Amount, Buildings and Fixtures 95,896      
Total [1] 119,661      
Accumulated Depreciation [2] (12,894)      
Net $ 106,767      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Riverside [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,527      
Wholly Owned Properties - Residential | Post Spring [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 18,596      
Initial Cost Buildings and Fixtures 57,819      
Gross Amount, Land 18,596      
Gross Amount, Buildings and Fixtures 62,338      
Total [1] 80,934      
Accumulated Depreciation [2] (8,099)      
Net $ 72,835      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Spring [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,519      
Wholly Owned Properties - Residential | Post Stratford [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Buildings and Fixtures $ 30,051      
Gross Amount, Buildings and Fixtures 32,851      
Total [1] 32,851      
Accumulated Depreciation [2] (4,328)      
Net $ 28,523      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Stratford [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,800      
Wholly Owned Properties - Residential | Sanctuary at Oglethorpe [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 6,875      
Initial Cost Buildings and Fixtures 31,441      
Gross Amount, Land 6,875      
Gross Amount, Buildings and Fixtures 38,390      
Total [1] 45,265      
Accumulated Depreciation [2] (14,173)      
Net $ 31,092      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1994      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2008      
Wholly Owned Properties - Residential | Sanctuary at Oglethorpe [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,949      
Wholly Owned Properties - Residential | Post Centennial Park [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 13,650      
Initial Cost Buildings and Fixtures 10,950      
Gross Amount, Land 13,650      
Gross Amount, Buildings and Fixtures 72,527      
Total [1] 86,177      
Accumulated Depreciation [2] (3,643)      
Net $ 82,534      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2018      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Centennial Park [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 61,577      
Wholly Owned Properties - Residential | Prescott [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Duluth, GA      
Initial Cost Land $ 3,840      
Initial Cost Buildings and Fixtures 24,011      
Gross Amount, Land 3,840      
Gross Amount, Buildings and Fixtures 28,780      
Total [1] 32,620      
Accumulated Depreciation [2] (14,796)      
Net $ 17,824      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2001      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2004      
Wholly Owned Properties - Residential | Prescott [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,769      
Wholly Owned Properties - Residential | Colonial Grand at Berkeley Lake [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Duluth, GA      
Initial Cost Land $ 1,960      
Initial Cost Buildings and Fixtures 15,707      
Gross Amount, Land 1,960      
Gross Amount, Buildings and Fixtures 18,107      
Total [1] 20,067      
Accumulated Depreciation [2] (5,875)      
Net $ 14,192      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Berkeley Lake [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,400      
Wholly Owned Properties - Residential | Colonial Grand at River Oaks [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Duluth, GA      
Initial Cost Land $ 4,360      
Initial Cost Buildings and Fixtures 13,579      
Gross Amount, Land 4,360      
Gross Amount, Buildings and Fixtures 16,205      
Total [1] 20,565      
Accumulated Depreciation [2] (6,296)      
Net $ 14,269      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1992      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at River Oaks [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,626      
Wholly Owned Properties - Residential | Colonial Grand at River Plantation [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Duluth, GA      
Initial Cost Land $ 2,059      
Initial Cost Buildings and Fixtures 19,158      
Gross Amount, Land 2,059      
Gross Amount, Buildings and Fixtures 21,921      
Total [1] 23,980      
Accumulated Depreciation [2] (6,877)      
Net $ 17,103      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1994      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at River Plantation [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,763      
Wholly Owned Properties - Residential | Colonial Grand at McDaniel Farm [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Duluth, GA      
Initial Cost Land $ 3,985      
Initial Cost Buildings and Fixtures 32,206      
Gross Amount, Land 3,985      
Gross Amount, Buildings and Fixtures 36,844      
Total [1] 40,829      
Accumulated Depreciation [2] (11,637)      
Net $ 29,192      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at McDaniel Farm [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,638      
Wholly Owned Properties - Residential | Colonial Grand at Pleasant Hill [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Duluth, GA      
Initial Cost Land $ 6,753      
Initial Cost Buildings and Fixtures 32,202      
Gross Amount, Land 6,753      
Gross Amount, Buildings and Fixtures 37,501      
Total [1] 44,254      
Accumulated Depreciation [2] (11,240)      
Net $ 33,014      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Pleasant Hill [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,299      
Wholly Owned Properties - Residential | Colonial Grand at Mount Vernon [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dunwoody, GA      
Initial Cost Land $ 6,861      
Initial Cost Buildings and Fixtures 23,748      
Gross Amount, Land 6,861      
Gross Amount, Buildings and Fixtures 27,542      
Total [1] 34,403      
Accumulated Depreciation [2] (7,438)      
Net $ 26,965      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Mount Vernon [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,794      
Wholly Owned Properties - Residential | Lake Lanier Club [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Gainesville, GA      
Initial Cost Land $ 6,710      
Initial Cost Buildings and Fixtures 40,994      
Gross Amount, Land 6,710      
Gross Amount, Buildings and Fixtures 50,320      
Total [1] 57,030      
Accumulated Depreciation [2] (25,292)      
Net $ 31,738      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2005      
Wholly Owned Properties - Residential | Lake Lanier Club [Member] | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
Wholly Owned Properties - Residential | Lake Lanier Club [Member] | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2001      
Wholly Owned Properties - Residential | Lake Lanier Club [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 9,326      
Wholly Owned Properties - Residential | Colonial Grand at Shiloh [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Kennesaw, GA      
Initial Cost Land $ 4,864      
Initial Cost Buildings and Fixtures 45,893      
Gross Amount, Land 4,864      
Gross Amount, Buildings and Fixtures 51,075      
Total [1] 55,939      
Accumulated Depreciation [2] (14,614)      
Net $ 41,325      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2002      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Shiloh [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,182      
Wholly Owned Properties - Residential | Millstead Village [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location LaGrange, GA      
Initial Cost Land $ 3,100      
Initial Cost Buildings and Fixtures 29,240      
Gross Amount, Land 3,100      
Gross Amount, Buildings and Fixtures 31,172      
Total [1] 34,272      
Accumulated Depreciation [2] (7,789)      
Net $ 26,483      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2008      
Wholly Owned Properties - Residential | Millstead Village [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,932      
Wholly Owned Properties - Residential | Colonial Grand at Barrett Creek [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Marietta, GA      
Initial Cost Land $ 5,661      
Initial Cost Buildings and Fixtures 26,186      
Gross Amount, Land 5,661      
Gross Amount, Buildings and Fixtures 29,441      
Total [1] 35,102      
Accumulated Depreciation [2] (9,620)      
Net $ 25,482      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Barrett Creek [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,255      
Wholly Owned Properties - Residential | Colonial Grand at Godley Station [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Pooler, GA      
Encumbrances $ 7,842      
Initial Cost Land 1,800      
Initial Cost Buildings and Fixtures 35,454      
Gross Amount, Land 1,800      
Gross Amount, Buildings and Fixtures 39,320      
Total [1] 41,120      
Accumulated Depreciation [2] (10,375)      
Net $ 30,745      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2001      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Godley Station [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,866      
Wholly Owned Properties - Residential | Colonial Grand at Godley Lake [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Pooler, GA      
Initial Cost Land $ 1,750      
Initial Cost Buildings and Fixtures 30,893      
Gross Amount, Land 1,750      
Gross Amount, Buildings and Fixtures 32,352      
Total [1] 34,102      
Accumulated Depreciation [2] (8,818)      
Net $ 25,284      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Godley Lake [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,459      
Wholly Owned Properties - Residential | Avala at Savannah Quarters [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Savannah, GA      
Initial Cost Land $ 1,500      
Initial Cost Buildings and Fixtures 24,862      
Gross Amount, Land 1,500      
Gross Amount, Buildings and Fixtures 27,045      
Total [1] 28,545      
Accumulated Depreciation [2] (8,001)      
Net $ 20,544      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2011      
Wholly Owned Properties - Residential | Avala at Savannah Quarters [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,183      
Wholly Owned Properties - Residential | Georgetown Grove [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Savannah, GA      
Initial Cost Land $ 1,288      
Initial Cost Buildings and Fixtures 11,579      
Gross Amount, Land 1,288      
Gross Amount, Buildings and Fixtures 15,274      
Total [1] 16,562      
Accumulated Depreciation [2] (10,571)      
Net $ 5,991      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1998      
Wholly Owned Properties - Residential | Georgetown Grove [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,695      
Wholly Owned Properties - Residential | Colonial Grand at Hammocks [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Savannah, GA      
Initial Cost Land $ 2,441      
Initial Cost Buildings and Fixtures 36,863      
Gross Amount, Land 2,441      
Gross Amount, Buildings and Fixtures 41,635      
Total [1] 44,076      
Accumulated Depreciation [2] (11,130)      
Net $ 32,946      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Hammocks [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,772      
Wholly Owned Properties - Residential | Colonial Village at Greentree [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Savannah, GA      
Initial Cost Land $ 1,710      
Initial Cost Buildings and Fixtures 10,494      
Gross Amount, Land 1,710      
Gross Amount, Buildings and Fixtures 12,524      
Total [1] 14,234      
Accumulated Depreciation [2] (4,088)      
Net $ 10,146      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1984      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village at Greentree [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,030      
Wholly Owned Properties - Residential | Colonial Village at Huntington [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Savannah, GA      
Initial Cost Land $ 2,521      
Initial Cost Buildings and Fixtures 8,223      
Gross Amount, Land 2,521      
Gross Amount, Buildings and Fixtures 9,856      
Total [1] 12,377      
Accumulated Depreciation [2] (2,860)      
Net $ 9,517      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1986      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village at Huntington [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,633      
Wholly Owned Properties - Residential | Colonial Village at Marsh Cove [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Savannah, GA      
Initial Cost Land $ 5,231      
Initial Cost Buildings and Fixtures 8,555      
Gross Amount, Land 5,231      
Gross Amount, Buildings and Fixtures 10,230      
Total [1] 15,461      
Accumulated Depreciation [2] (3,428)      
Net $ 12,033      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1983      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village at Marsh Cove [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,675      
Wholly Owned Properties - Residential | Oaks at Wilmington Island [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Savannah, GA      
Initial Cost Land $ 2,910      
Initial Cost Buildings and Fixtures 25,315      
Gross Amount, Land 2,864      
Gross Amount, Buildings and Fixtures 30,283      
Total [1] 33,147      
Accumulated Depreciation [2] (13,747)      
Net $ 19,400      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2006      
Wholly Owned Properties - Residential | Oaks at Wilmington Island [Member] | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ (46)      
Wholly Owned Properties - Residential | Oaks at Wilmington Island [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,968      
Wholly Owned Properties - Residential | Highlands of West Village [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Smyrna, GA      
Initial Cost Land $ 14,410      
Initial Cost Buildings and Fixtures 73,733      
Gross Amount, Land 14,410      
Gross Amount, Buildings and Fixtures 81,338      
Total [1] 95,748      
Accumulated Depreciation [2] (15,459)      
Net $ 80,289      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2014      
Wholly Owned Properties - Residential | Highlands of West Village [Member] | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2006      
Wholly Owned Properties - Residential | Highlands of West Village [Member] | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2012      
Wholly Owned Properties - Residential | Highlands of West Village [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 7,605      
Wholly Owned Properties - Residential | Haven at Prairie Trace [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Overland Park, KS      
Initial Cost Land $ 3,500      
Initial Cost Buildings and Fixtures 40,614      
Gross Amount, Land 3,500      
Gross Amount, Buildings and Fixtures 42,035      
Total [1] 45,535      
Accumulated Depreciation [2] (5,063)      
Net $ 40,472      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2015      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2015      
Wholly Owned Properties - Residential | Haven at Prairie Trace [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,421      
Wholly Owned Properties - Residential | Grand Reserve at Pinnacle [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Lexington, KY      
Initial Cost Land $ 2,024      
Initial Cost Buildings and Fixtures 31,525      
Gross Amount, Land 2,024      
Gross Amount, Buildings and Fixtures 38,095      
Total [1] 40,119      
Accumulated Depreciation [2] (19,649)      
Net $ 20,470      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1998      
Wholly Owned Properties - Residential | Grand Reserve at Pinnacle [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,570      
Wholly Owned Properties - Residential | Lakepointe [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Lexington, KY      
Initial Cost Land $ 411      
Initial Cost Buildings and Fixtures 3,699      
Gross Amount, Land 411      
Gross Amount, Buildings and Fixtures 6,489      
Total [1] 6,900      
Accumulated Depreciation [2] (4,872)      
Net $ 2,028      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1986      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | Lakepointe [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,790      
Wholly Owned Properties - Residential | The Mansion [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Lexington, KY      
Initial Cost Land $ 694      
Initial Cost Buildings and Fixtures 6,242      
Gross Amount, Land 694      
Gross Amount, Buildings and Fixtures 10,173      
Total [1] 10,867      
Accumulated Depreciation [2] (7,692)      
Net $ 3,175      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1989      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | The Mansion [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,931      
Wholly Owned Properties - Residential | The Village [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Lexington, KY      
Initial Cost Land $ 900      
Initial Cost Buildings and Fixtures 8,097      
Gross Amount, Land 900      
Gross Amount, Buildings and Fixtures 12,959      
Total [1] 13,859      
Accumulated Depreciation [2] (9,861)      
Net $ 3,998      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1989      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | The Village [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,862      
Wholly Owned Properties - Residential | Stonemill Village [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Louisville, KY      
Initial Cost Land $ 1,169      
Initial Cost Buildings and Fixtures 10,518      
Gross Amount, Land 1,169      
Gross Amount, Buildings and Fixtures 20,581      
Total [1] 21,750      
Accumulated Depreciation [2] (15,189)      
Net $ 6,561      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1985      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | Stonemill Village [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 10,063      
Wholly Owned Properties - Residential | Crosswinds [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jackson, MS      
Initial Cost Land $ 1,535      
Initial Cost Buildings and Fixtures 13,826      
Gross Amount, Land 1,535      
Gross Amount, Buildings and Fixtures 20,254      
Total [1] 21,789      
Accumulated Depreciation [2] (14,410)      
Net $ 7,379      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1989      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1996      
Wholly Owned Properties - Residential | Crosswinds [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,428      
Wholly Owned Properties - Residential | Pear Orchard [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jackson, MS      
Initial Cost Land $ 1,351      
Initial Cost Buildings and Fixtures 12,168      
Gross Amount, Land 1,351      
Gross Amount, Buildings and Fixtures 21,042      
Total [1] 22,393      
Accumulated Depreciation [2] (15,921)      
Net $ 6,472      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1985      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | Pear Orchard [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 8,874      
Wholly Owned Properties - Residential | Reflection Pointe [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jackson, MS      
Initial Cost Land $ 710      
Initial Cost Buildings and Fixtures 8,770      
Gross Amount, Land 848      
Gross Amount, Buildings and Fixtures 17,638      
Total [1] 18,486      
Accumulated Depreciation [2] (12,826)      
Net $ 5,660      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1986      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1988      
Wholly Owned Properties - Residential | Reflection Pointe [Member] | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 138      
Wholly Owned Properties - Residential | Reflection Pointe [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 8,868      
Wholly Owned Properties - Residential | Lakeshore Landing [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Ridgeland, MS      
Initial Cost Land $ 676      
Initial Cost Buildings and Fixtures 6,284      
Gross Amount, Land 676      
Gross Amount, Buildings and Fixtures 10,252      
Total [1] 10,928      
Accumulated Depreciation [2] (5,503)      
Net $ 5,425      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1974      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | Lakeshore Landing [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,968      
Wholly Owned Properties - Residential | Market Station        
Real Estate And Accumulated Depreciation [Line Items]        
Location Kansas City, MO      
Initial Cost Land $ 5,814      
Initial Cost Buildings and Fixtures 46,241      
Gross Amount, Land 5,814      
Gross Amount, Buildings and Fixtures 48,816      
Total [1] 54,630      
Accumulated Depreciation [2] (12,251)      
Net $ 42,379      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2010      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2012      
Wholly Owned Properties - Residential | Market Station | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,575      
Wholly Owned Properties - Residential | The Denton [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Kansas City, MO      
Initial Cost Land $ 750      
Initial Cost Buildings and Fixtures 8,795      
Gross Amount, Land 750      
Gross Amount, Buildings and Fixtures 9,604      
Total [1] 10,354      
Accumulated Depreciation [2] (1,019)      
Net $ 9,335      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2014      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2015      
Wholly Owned Properties - Residential | The Denton [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 809      
Wholly Owned Properties - Residential | The Denton II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Kansas City, MO      
Initial Cost Land $ 770      
Gross Amount, Land 770      
Gross Amount, Buildings and Fixtures 24,397      
Total [1] 25,167      
Accumulated Depreciation [2] (1,289)      
Net $ 23,878      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2017      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2015      
Wholly Owned Properties - Residential | The Denton II [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 24,397      
Wholly Owned Properties - Residential | Post Parkside [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 11,025      
Initial Cost Buildings and Fixtures 34,277      
Gross Amount, Land 11,025      
Gross Amount, Buildings and Fixtures 35,768      
Total [1] 46,793      
Accumulated Depreciation [2] (4,114)      
Net $ 42,679      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Parkside [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,491      
Wholly Owned Properties - Residential | The Denton III        
Real Estate And Accumulated Depreciation [Line Items]        
Location Kansas City, MO      
Initial Cost Land $ 4,000      
Initial Cost Buildings and Fixtures 42,144      
Gross Amount, Land 4,000      
Gross Amount, Buildings and Fixtures 44,051      
Total [1] 48,051      
Accumulated Depreciation [2] (5,775)      
Net $ 42,276      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2015      
Wholly Owned Properties - Residential | The Denton III | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
Wholly Owned Properties - Residential | The Denton III | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2014      
Wholly Owned Properties - Residential | The Denton III | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,907      
Wholly Owned Properties - Residential | Colonial Grand at Desert Vista [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location North Las Vegas, NV      
Initial Cost Land $ 4,091      
Initial Cost Buildings and Fixtures 29,826      
Gross Amount, Land 4,091      
Gross Amount, Buildings and Fixtures 31,939      
Total [1] 36,030      
Accumulated Depreciation [2] (8,840)      
Net $ 27,190      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Desert Vista [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,113      
Wholly Owned Properties - Residential | Colonial Grand at Palm Vista [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location North Las Vegas, NV      
Initial Cost Land $ 4,909      
Initial Cost Buildings and Fixtures 25,643      
Gross Amount, Land 4,909      
Gross Amount, Buildings and Fixtures 29,161      
Total [1] 34,070      
Accumulated Depreciation [2] (8,533)      
Net $ 25,537      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2007      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Palm Vista [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,518      
Wholly Owned Properties - Residential | Colonial Village at beaver creek [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Apex, NC      
Initial Cost Land $ 7,491      
Initial Cost Buildings and Fixtures 34,863      
Gross Amount, Land 7,491      
Gross Amount, Buildings and Fixtures 37,452      
Total [1] 44,943      
Accumulated Depreciation [2] (9,809)      
Net $ 35,134      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2007      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village at beaver creek [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,589      
Wholly Owned Properties - Residential | Hermitage at Beechtree [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Cary, NC      
Initial Cost Land $ 900      
Initial Cost Buildings and Fixtures 8,099      
Gross Amount, Land 900      
Gross Amount, Buildings and Fixtures 13,366      
Total [1] 14,266      
Accumulated Depreciation [2] (9,113)      
Net $ 5,153      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1988      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1997      
Wholly Owned Properties - Residential | Hermitage at Beechtree [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,267      
Wholly Owned Properties - Residential | Waterford Forest [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Cary, NC      
Initial Cost Land $ 4,000      
Initial Cost Buildings and Fixtures 20,250      
Gross Amount, Land 4,000      
Gross Amount, Buildings and Fixtures 24,381      
Total [1] 28,381      
Accumulated Depreciation [2] (12,221)      
Net $ 16,160      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2005      
Wholly Owned Properties - Residential | Waterford Forest [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,131      
Wholly Owned Properties - Residential | 1225 South Church I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 9,612      
Initial Cost Buildings and Fixtures 22,342      
Gross Amount, Land 9,612      
Gross Amount, Buildings and Fixtures 51,176      
Total [1] 60,788      
Accumulated Depreciation [2] (10,860)      
Net $ 49,928      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2010      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2010      
Wholly Owned Properties - Residential | 1225 South Church I [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 28,834      
Wholly Owned Properties - Residential | Colonial Grand at Ayrsley [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 2,481      
Initial Cost Buildings and Fixtures 52,119      
Gross Amount, Land 2,481      
Gross Amount, Buildings and Fixtures 66,802      
Total [1] 69,283      
Accumulated Depreciation [2] (16,143)      
Net $ 53,140      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Ayrsley [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 14,683      
Wholly Owned Properties - Residential | Colonial Grand at Beverly Crest [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 3,161      
Initial Cost Buildings and Fixtures 24,004      
Gross Amount, Land 3,161      
Gross Amount, Buildings and Fixtures 27,309      
Total [1] 30,470      
Accumulated Depreciation [2] (7,335)      
Net $ 23,135      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Beverly Crest [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,305      
Wholly Owned Properties - Residential | Colonial Grand at Legacy Park [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 2,891      
Initial Cost Buildings and Fixtures 28,272      
Gross Amount, Land 2,891      
Gross Amount, Buildings and Fixtures 31,133      
Total [1] 34,024      
Accumulated Depreciation [2] (8,502)      
Net $ 25,522      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2001      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Legacy Park [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,861      
Wholly Owned Properties - Residential | Colonial Grand at Mallard Creek [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 4,591      
Initial Cost Buildings and Fixtures 27,713      
Gross Amount, Land 4,591      
Gross Amount, Buildings and Fixtures 30,006      
Total [1] 34,597      
Accumulated Depreciation [2] (8,302)      
Net $ 26,295      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2005      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Mallard Creek [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,293      
Wholly Owned Properties - Residential | Colonial Grand at Mallard Lake [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 3,250      
Initial Cost Buildings and Fixtures 31,389      
Gross Amount, Land 3,250      
Gross Amount, Buildings and Fixtures 36,012      
Total [1] 39,262      
Accumulated Depreciation [2] (10,139)      
Net $ 29,123      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Mallard Lake [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,623      
Wholly Owned Properties - Residential | Colonial Grand at University Center [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 1,620      
Initial Cost Buildings and Fixtures 17,499      
Gross Amount, Land 1,620      
Gross Amount, Buildings and Fixtures 18,474      
Total [1] 20,094      
Accumulated Depreciation [2] (4,753)      
Net $ 15,341      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2005      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at University Center [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 975      
Wholly Owned Properties - Residential | Colonial Reserve at South End [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 4,628      
Initial Cost Buildings and Fixtures 44,282      
Gross Amount, Land 4,628      
Gross Amount, Buildings and Fixtures 56,313      
Total [1] 60,941      
Accumulated Depreciation [2] (8,234)      
Net $ 52,707      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Reserve at South End [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 12,031      
Wholly Owned Properties - Residential | Colonial Village at Chancellor Park [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 5,311      
Initial Cost Buildings and Fixtures 28,016      
Gross Amount, Land 5,311      
Gross Amount, Buildings and Fixtures 32,704      
Total [1] 38,015      
Accumulated Depreciation [2] (8,916)      
Net $ 29,099      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village at Chancellor Park [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,688      
Wholly Owned Properties - Residential | Colonial Village at South Tryon [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 2,260      
Initial Cost Buildings and Fixtures 19,489      
Gross Amount, Land 2,260      
Gross Amount, Buildings and Fixtures 21,819      
Total [1] 24,079      
Accumulated Depreciation [2] (5,977)      
Net $ 18,102      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2002      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village at South Tryon [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,330      
Wholly Owned Properties - Residential | Colonial Village At Timber Crest        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 2,901      
Initial Cost Buildings and Fixtures 17,192      
Gross Amount, Land 2,901      
Gross Amount, Buildings and Fixtures 20,062      
Total [1] 22,963      
Accumulated Depreciation [2] (5,219)      
Net $ 17,744      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Timber Crest | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,870      
Wholly Owned Properties - Residential | Enclave [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 1,461      
Initial Cost Buildings and Fixtures 18,984      
Gross Amount, Land 1,461      
Gross Amount, Buildings and Fixtures 20,423      
Total [1] 21,884      
Accumulated Depreciation [2] (4,800)      
Net $ 17,084      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Enclave [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,439      
Wholly Owned Properties - Residential | Post Ballantyne [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 16,216      
Initial Cost Buildings and Fixtures 44,817      
Gross Amount, Land 16,216      
Gross Amount, Buildings and Fixtures 47,515      
Total [1] 63,731      
Accumulated Depreciation [2] (5,770)      
Net $ 57,961      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2004      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Ballantyne [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,698      
Wholly Owned Properties - Residential | Post Gateway Place        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 17,528      
Initial Cost Buildings and Fixtures 57,444      
Gross Amount, Land 17,528      
Gross Amount, Buildings and Fixtures 61,841      
Total [1] 79,369      
Accumulated Depreciation [2] (8,021)      
Net $ 71,348      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Gateway Place | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,397      
Wholly Owned Properties - Residential | Post Park at Phillips Place [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 20,869      
Initial Cost Buildings and Fixtures 65,517      
Gross Amount, Land 20,869      
Gross Amount, Buildings and Fixtures 70,467      
Total [1] 91,336      
Accumulated Depreciation [2] (8,729)      
Net $ 82,607      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Park at Phillips Place [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,950      
Wholly Owned Properties - Residential | Post South End [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 18,835      
Initial Cost Buildings and Fixtures 58,795      
Gross Amount, Land 18,835      
Gross Amount, Buildings and Fixtures 60,931      
Total [1] 79,766      
Accumulated Depreciation [2] (6,803)      
Net $ 72,963      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post South End [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,136      
Wholly Owned Properties - Residential | Post Uptown Place [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 10,888      
Initial Cost Buildings and Fixtures 30,078      
Gross Amount, Land 10,888      
Gross Amount, Buildings and Fixtures 32,274      
Total [1] 43,162      
Accumulated Depreciation [2] (4,034)      
Net $ 39,128      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Uptown Place [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,196      
Wholly Owned Properties - Residential | Colonial Grand at Cornelius [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Cornelius, NC      
Initial Cost Land $ 4,571      
Initial Cost Buildings and Fixtures 29,151      
Gross Amount, Land 4,571      
Gross Amount, Buildings and Fixtures 30,900      
Total [1] 35,471      
Accumulated Depreciation [2] (8,758)      
Net $ 26,713      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Cornelius [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,749      
Wholly Owned Properties - Residential | Colonial Grand at Patterson Place [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Durham, NC      
Initial Cost Land $ 2,590      
Initial Cost Buildings and Fixtures 27,126      
Gross Amount, Land 2,590      
Gross Amount, Buildings and Fixtures 30,585      
Total [1] 33,175      
Accumulated Depreciation [2] (8,218)      
Net $ 24,957      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Patterson Place [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,459      
Wholly Owned Properties - Residential | Colonial Village at Deerfield [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Durham, NC      
Initial Cost Land $ 3,271      
Initial Cost Buildings and Fixtures 15,609      
Gross Amount, Land 3,271      
Gross Amount, Buildings and Fixtures 17,301      
Total [1] 20,572      
Accumulated Depreciation [2] (5,556)      
Net $ 15,016      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1985      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village at Deerfield [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,692      
Wholly Owned Properties - Residential | Colonial Grand at Research Park [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Durham, NC      
Initial Cost Land $ 4,201      
Initial Cost Buildings and Fixtures 37,682      
Gross Amount, Land 4,201      
Gross Amount, Buildings and Fixtures 41,102      
Total [1] 45,303      
Accumulated Depreciation [2] (11,279)      
Net $ 34,024      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2002      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand at Research Park [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,420      
Wholly Owned Properties - Residential | Colonial Grand At Huntersville[Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Huntersville, NC      
Initial Cost Land $ 4,251      
Initial Cost Buildings and Fixtures 31,948      
Gross Amount, Land 4,251      
Gross Amount, Buildings and Fixtures 35,087      
Total [1] 39,338      
Accumulated Depreciation [2] (9,644)      
Net $ 29,694      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Huntersville[Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,139      
Wholly Owned Properties - Residential | Colonial Village At Matthews        
Real Estate And Accumulated Depreciation [Line Items]        
Location Matthews, NC      
Initial Cost Land $ 3,071      
Initial Cost Buildings and Fixtures 21,830      
Gross Amount, Land 3,071      
Gross Amount, Buildings and Fixtures 27,079      
Total [1] 30,150      
Accumulated Depreciation [2] (8,434)      
Net $ 21,716      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Matthews | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,249      
Wholly Owned Properties - Residential | Colonial Grand At Matthews Commons        
Real Estate And Accumulated Depreciation [Line Items]        
Location Matthews, NC      
Initial Cost Land $ 3,690      
Initial Cost Buildings and Fixtures 28,536      
Gross Amount, Land 3,690      
Gross Amount, Buildings and Fixtures 30,893      
Total [1] 34,583      
Accumulated Depreciation [2] (8,470)      
Net $ 26,113      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Matthews Commons | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,357      
Wholly Owned Properties - Residential | Colonial Grand At Arringdon        
Real Estate And Accumulated Depreciation [Line Items]        
Location Morrisville, NC      
Initial Cost Land $ 6,401      
Initial Cost Buildings and Fixtures 31,134      
Gross Amount, Land 6,401      
Gross Amount, Buildings and Fixtures 34,868      
Total [1] 41,269      
Accumulated Depreciation [2] (9,465)      
Net $ 31,804      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2003      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Arringdon | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,734      
Wholly Owned Properties - Residential | Colonial Grand At Brier Creek Raleigh Nc        
Real Estate And Accumulated Depreciation [Line Items]        
Location Raleigh, NC      
Initial Cost Land $ 7,372      
Initial Cost Buildings and Fixtures 50,202      
Gross Amount, Land 7,372      
Gross Amount, Buildings and Fixtures 52,791      
Total [1] 60,163      
Accumulated Depreciation [2] (13,800)      
Net $ 46,363      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2010      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Brier Creek Raleigh Nc | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,589      
Wholly Owned Properties - Residential | Colonial Grand At Brier Falls Raleigh Nc        
Real Estate And Accumulated Depreciation [Line Items]        
Location Raleigh, NC      
Initial Cost Land $ 6,572      
Initial Cost Buildings and Fixtures 48,910      
Gross Amount, Land 6,572      
Gross Amount, Buildings and Fixtures 51,285      
Total [1] 57,857      
Accumulated Depreciation [2] (13,103)      
Net $ 44,754      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Brier Falls Raleigh Nc | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,375      
Wholly Owned Properties - Residential | Colonial Grand At Crabtree Valley        
Real Estate And Accumulated Depreciation [Line Items]        
Location Raleigh, NC      
Initial Cost Land $ 2,241      
Initial Cost Buildings and Fixtures 18,434      
Gross Amount, Land 2,241      
Gross Amount, Buildings and Fixtures 20,512      
Total [1] 22,753      
Accumulated Depreciation [2] (5,207)      
Net $ 17,546      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Crabtree Valley | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,078      
Wholly Owned Properties - Residential | Hue        
Real Estate And Accumulated Depreciation [Line Items]        
Location Raleigh, NC      
Initial Cost Land $ 3,690      
Initial Cost Buildings and Fixtures 29,910      
Gross Amount, Land 3,690      
Gross Amount, Buildings and Fixtures 32,545      
Total [1] 36,235      
Accumulated Depreciation [2] (8,522)      
Net $ 27,713      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2010      
Wholly Owned Properties - Residential | Hue | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,635      
Wholly Owned Properties - Residential | Colonial Grand At Trinity Commons        
Real Estate And Accumulated Depreciation [Line Items]        
Location Raleigh, NC      
Initial Cost Land $ 5,232      
Initial Cost Buildings and Fixtures 45,138      
Gross Amount, Land 5,232      
Gross Amount, Buildings and Fixtures 49,271      
Total [1] 54,503      
Accumulated Depreciation [2] (13,833)      
Net $ 40,670      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Trinity Commons | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
Wholly Owned Properties - Residential | Colonial Grand At Trinity Commons | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2002      
Wholly Owned Properties - Residential | Colonial Grand At Trinity Commons | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,133      
Wholly Owned Properties - Residential | Post Parksideat Wade        
Real Estate And Accumulated Depreciation [Line Items]        
Location Raleigh, NC      
Initial Cost Land $ 7,196      
Initial Cost Buildings and Fixtures 51,972      
Gross Amount, Land 7,196      
Gross Amount, Buildings and Fixtures 53,184      
Total [1] 60,380      
Accumulated Depreciation [2] (6,259)      
Net $ 54,121      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2011      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Parksideat Wade | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,212      
Wholly Owned Properties - Residential | Post Parksideat Wade I I        
Real Estate And Accumulated Depreciation [Line Items]        
Location Raleigh, NC      
Initial Cost Land $ 9,450      
Initial Cost Buildings and Fixtures 46,316      
Gross Amount, Land 10,037      
Gross Amount, Buildings and Fixtures 47,952      
Total [1] 57,989      
Accumulated Depreciation [2] (8,923)      
Net $ 49,066      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2017      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Parksideat Wade I I | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 587      
Wholly Owned Properties - Residential | Post Parksideat Wade I I | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,636      
Wholly Owned Properties - Residential | Post Parkside At Wade I I I        
Real Estate And Accumulated Depreciation [Line Items]        
Location Raleigh, NC      
Initial Cost Land $ 2,200      
Gross Amount, Land 2,200      
Gross Amount, Buildings and Fixtures 21,523      
Total [1] 23,723      
Accumulated Depreciation [2] (283)      
Net $ 23,440      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2019      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Parkside At Wade I I I | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 21,523      
Wholly Owned Properties - Residential | Preserve At Brier Creek        
Real Estate And Accumulated Depreciation [Line Items]        
Location Raleigh, NC      
Initial Cost Land $ 5,850      
Initial Cost Buildings and Fixtures 21,980      
Gross Amount, Land 5,831      
Gross Amount, Buildings and Fixtures 47,977      
Total [1] 53,808      
Accumulated Depreciation [2] (19,476)      
Net $ 34,332      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2004      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2006      
Wholly Owned Properties - Residential | Preserve At Brier Creek | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ (19)      
Wholly Owned Properties - Residential | Preserve At Brier Creek | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 25,997      
Wholly Owned Properties - Residential | Providence At Brier Creek        
Real Estate And Accumulated Depreciation [Line Items]        
Location Raleigh, NC      
Initial Cost Land $ 4,695      
Initial Cost Buildings and Fixtures 29,007      
Gross Amount, Land 4,695      
Gross Amount, Buildings and Fixtures 31,218      
Total [1] 35,913      
Accumulated Depreciation [2] (12,347)      
Net $ 23,566      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2007      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2008      
Wholly Owned Properties - Residential | Providence At Brier Creek | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,211      
Wholly Owned Properties - Residential | Tanglewood        
Real Estate And Accumulated Depreciation [Line Items]        
Location Anderson, SC      
Initial Cost Land $ 427      
Initial Cost Buildings and Fixtures 3,853      
Gross Amount, Land 427      
Gross Amount, Buildings and Fixtures 6,918      
Total [1] 7,345      
Accumulated Depreciation [2] (5,518)      
Net $ 1,827      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1980      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | Tanglewood | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,065      
Wholly Owned Properties - Residential | Colonial Grand At Cypress Cove        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charleston, SC      
Initial Cost Land $ 3,610      
Initial Cost Buildings and Fixtures 28,645      
Gross Amount, Land 3,610      
Gross Amount, Buildings and Fixtures 31,120      
Total [1] 34,730      
Accumulated Depreciation [2] (8,683)      
Net $ 26,047      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2001      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Cypress Cove | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,475      
Wholly Owned Properties - Residential | Colonial Village At Hampton Pointe        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charleston, SC      
Initial Cost Land $ 3,971      
Initial Cost Buildings and Fixtures 22,790      
Gross Amount, Land 3,971      
Gross Amount, Buildings and Fixtures 28,902      
Total [1] 32,873      
Accumulated Depreciation [2] (7,846)      
Net $ 25,027      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1986      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Hampton Pointe | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,112      
Wholly Owned Properties - Residential | Colonial Grand At Quarterdeck        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charleston, SC      
Initial Cost Land $ 920      
Initial Cost Buildings and Fixtures 24,097      
Gross Amount, Land 920      
Gross Amount, Buildings and Fixtures 30,232      
Total [1] 31,152      
Accumulated Depreciation [2] (8,238)      
Net $ 22,914      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1987      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Quarterdeck | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,135      
Wholly Owned Properties - Residential | Colonial Village At Westchase        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charleston, SC      
Initial Cost Land $ 4,571      
Initial Cost Buildings and Fixtures 20,091      
Gross Amount, Land 4,571      
Gross Amount, Buildings and Fixtures 24,464      
Total [1] 29,035      
Accumulated Depreciation [2] (7,483)      
Net $ 21,552      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1985      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Westchase | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,373      
Wholly Owned Properties - Residential | Rivers Walk        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charleston, SC      
Initial Cost Land $ 8,831      
Initial Cost Buildings and Fixtures 39,430      
Gross Amount, Land 8,831      
Gross Amount, Buildings and Fixtures 41,277      
Total [1] 50,108      
Accumulated Depreciation [2] (5,699)      
Net $ 44,409      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Rivers Walk | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
Wholly Owned Properties - Residential | Rivers Walk | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2016      
Wholly Owned Properties - Residential | Rivers Walk | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,847      
Wholly Owned Properties - Residential | A1201 Midtown        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charleston, SC      
Initial Cost Land $ 11,929      
Initial Cost Buildings and Fixtures 57,885      
Gross Amount, Land 11,929      
Gross Amount, Buildings and Fixtures 58,562      
Total [1] 70,491      
Accumulated Depreciation [2] (5,346)      
Net $ 65,145      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2015      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | A1201 Midtown | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 677      
Wholly Owned Properties - Residential | A1201 Midtown I I        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charleston, SC      
Initial Cost Land $ 6,750      
Initial Cost Buildings and Fixtures 5,874      
Gross Amount, Land 6,750      
Gross Amount, Buildings and Fixtures 21,895      
Total [1] 28,645      
Accumulated Depreciation [2] (826)      
Net $ 27,819      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2018      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | A1201 Midtown I I | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 16,021      
Wholly Owned Properties - Residential | Fairways        
Real Estate And Accumulated Depreciation [Line Items]        
Location Columbia, SC      
Initial Cost Land $ 910      
Initial Cost Buildings and Fixtures 8,207      
Gross Amount, Land 910      
Gross Amount, Buildings and Fixtures 11,653      
Total [1] 12,563      
Accumulated Depreciation [2] (8,994)      
Net $ 3,569      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1992      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | Fairways | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,446      
Wholly Owned Properties - Residential | Paddock Club Columbia        
Real Estate And Accumulated Depreciation [Line Items]        
Location Columbia, SC      
Initial Cost Land $ 1,840      
Initial Cost Buildings and Fixtures 16,560      
Gross Amount, Land 1,840      
Gross Amount, Buildings and Fixtures 22,010      
Total [1] 23,850      
Accumulated Depreciation [2] (15,348)      
Net $ 8,502      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1991      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1997      
Wholly Owned Properties - Residential | Paddock Club Columbia | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,450      
Wholly Owned Properties - Residential | Colonial Village At Windsor Place        
Real Estate And Accumulated Depreciation [Line Items]        
Location Goose Creek, SC      
Initial Cost Land $ 1,321      
Initial Cost Buildings and Fixtures 14,163      
Gross Amount, Land 1,321      
Gross Amount, Buildings and Fixtures 17,506      
Total [1] 18,827      
Accumulated Depreciation [2] (5,448)      
Net $ 13,379      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1985      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Windsor Place | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,343      
Wholly Owned Properties - Residential | Highland Ridge        
Real Estate And Accumulated Depreciation [Line Items]        
Location Greenville, SC      
Initial Cost Land $ 482      
Initial Cost Buildings and Fixtures 4,337      
Gross Amount, Land 482      
Gross Amount, Buildings and Fixtures 7,319      
Total [1] 7,801      
Accumulated Depreciation [2] (5,037)      
Net $ 2,764      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1984      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1995      
Wholly Owned Properties - Residential | Highland Ridge | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,982      
Wholly Owned Properties - Residential | Howell Commons        
Real Estate And Accumulated Depreciation [Line Items]        
Location Greenville, SC      
Initial Cost Land $ 1,304      
Initial Cost Buildings and Fixtures 11,740      
Gross Amount, Land 1,304      
Gross Amount, Buildings and Fixtures 15,866      
Total [1] 17,170      
Accumulated Depreciation [2] (11,380)      
Net $ 5,790      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1987      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1997      
Wholly Owned Properties - Residential | Howell Commons | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,126      
Wholly Owned Properties - Residential | Paddock Club Greenville        
Real Estate And Accumulated Depreciation [Line Items]        
Location Greenville, SC      
Initial Cost Land $ 1,200      
Initial Cost Buildings and Fixtures 10,800      
Gross Amount, Land 1,200      
Gross Amount, Buildings and Fixtures 13,477      
Total [1] 14,677      
Accumulated Depreciation [2] (9,306)      
Net $ 5,371      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1997      
Wholly Owned Properties - Residential | Paddock Club Greenville | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,677      
Wholly Owned Properties - Residential | Park Haywood        
Real Estate And Accumulated Depreciation [Line Items]        
Location Greenville, SC      
Initial Cost Land $ 325      
Initial Cost Buildings and Fixtures 2,925      
Gross Amount, Land 360      
Gross Amount, Buildings and Fixtures 7,741      
Total [1] 8,101      
Accumulated Depreciation [2] (5,797)      
Net $ 2,304      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1983      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1993      
Wholly Owned Properties - Residential | Park Haywood | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 35      
Wholly Owned Properties - Residential | Park Haywood | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,816      
Wholly Owned Properties - Residential | Spring Creek        
Real Estate And Accumulated Depreciation [Line Items]        
Location Greenville, SC      
Initial Cost Land $ 597      
Initial Cost Buildings and Fixtures 5,374      
Gross Amount, Land 583      
Gross Amount, Buildings and Fixtures 8,405      
Total [1] 8,988      
Accumulated Depreciation [2] (6,216)      
Net $ 2,772      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1983      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1995      
Wholly Owned Properties - Residential | Spring Creek | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ (14)      
Wholly Owned Properties - Residential | Spring Creek | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,031      
Wholly Owned Properties - Residential | Innovation Apartment Homes        
Real Estate And Accumulated Depreciation [Line Items]        
Location Greenville, SC      
Initial Cost Land $ 4,437      
Initial Cost Buildings and Fixtures 52,026      
Gross Amount, Land 4,437      
Gross Amount, Buildings and Fixtures 53,572      
Total [1] 58,009      
Accumulated Depreciation [2] (6,098)      
Net $ 51,911      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2015      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Innovation Apartment Homes | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,546      
Wholly Owned Properties - Residential | The Greene [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Greenville, SC      
Initial Cost Land $ 5,420      
Initial Cost Buildings and Fixtures 66,546      
Gross Amount, Land 5,427      
Gross Amount, Buildings and Fixtures 66,649      
Total [1] 72,076      
Accumulated Depreciation [2] (158)      
Net $ 71,918      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2019      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2019      
Wholly Owned Properties - Residential | The Greene [Member] | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 7      
Wholly Owned Properties - Residential | The Greene [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 103      
Wholly Owned Properties - Residential | Runaway Bay        
Real Estate And Accumulated Depreciation [Line Items]        
Location Mt. Pleasant, SC      
Initial Cost Land $ 1,085      
Initial Cost Buildings and Fixtures 7,269      
Gross Amount, Land 1,097      
Gross Amount, Buildings and Fixtures 14,109      
Total [1] 15,206      
Accumulated Depreciation [2] (9,997)      
Net $ 5,209      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1988      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1995      
Wholly Owned Properties - Residential | Runaway Bay | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 12      
Wholly Owned Properties - Residential | Runaway Bay | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,840      
Wholly Owned Properties - Residential | Colonial Grand At Commerce Park Charleston Sc        
Real Estate And Accumulated Depreciation [Line Items]        
Location North Charleston, SC      
Initial Cost Land $ 2,780      
Initial Cost Buildings and Fixtures 33,966      
Gross Amount, Land 2,780      
Gross Amount, Buildings and Fixtures 36,806      
Total [1] 39,586      
Accumulated Depreciation [2] (9,678)      
Net $ 29,908      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Commerce Park Charleston Sc | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,840      
Wholly Owned Properties - Residential | Brookwood535        
Real Estate And Accumulated Depreciation [Line Items]        
Location Simpsonville, SC      
Encumbrances $ 11,690      
Initial Cost Land 1,216      
Initial Cost Buildings and Fixtures 18,666      
Gross Amount, Land 1,216      
Gross Amount, Buildings and Fixtures 20,441      
Total [1] 21,657      
Accumulated Depreciation [2] (6,856)      
Net $ 14,801      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2010      
Wholly Owned Properties - Residential | Brookwood535 | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,775      
Wholly Owned Properties - Residential | Park Place        
Real Estate And Accumulated Depreciation [Line Items]        
Location Spartanburg, SC      
Initial Cost Land $ 723      
Initial Cost Buildings and Fixtures 6,504      
Gross Amount, Land 723      
Gross Amount, Buildings and Fixtures 9,665      
Total [1] 10,388      
Accumulated Depreciation [2] (6,966)      
Net $ 3,422      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1987      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1997      
Wholly Owned Properties - Residential | Park Place | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,161      
Wholly Owned Properties - Residential | Farmington Village        
Real Estate And Accumulated Depreciation [Line Items]        
Location Summerville, SC      
Initial Cost Land $ 2,800      
Initial Cost Buildings and Fixtures 26,295      
Gross Amount, Land 2,800      
Gross Amount, Buildings and Fixtures 28,908      
Total [1] 31,708      
Accumulated Depreciation [2] (12,090)      
Net $ 19,618      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2007      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2007      
Wholly Owned Properties - Residential | Farmington Village | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,613      
Wholly Owned Properties - Residential | Colonial Village At Waters Edge        
Real Estate And Accumulated Depreciation [Line Items]        
Location Summerville, SC      
Initial Cost Land $ 2,103      
Initial Cost Buildings and Fixtures 9,187      
Gross Amount, Land 2,103      
Gross Amount, Buildings and Fixtures 13,404      
Total [1] 15,507      
Accumulated Depreciation [2] (4,789)      
Net $ 10,718      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1985      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Waters Edge | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,217      
Wholly Owned Properties - Residential | Hamilton Pointe        
Real Estate And Accumulated Depreciation [Line Items]        
Location Chattanooga, TN      
Initial Cost Land $ 1,131      
Initial Cost Buildings and Fixtures 10,632      
Gross Amount, Land 1,131      
Gross Amount, Buildings and Fixtures 15,354      
Total [1] 16,485      
Accumulated Depreciation [2] (8,518)      
Net $ 7,967      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1989      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1992      
Wholly Owned Properties - Residential | Hamilton Pointe | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,722      
Wholly Owned Properties - Residential | Hidden Creek        
Real Estate And Accumulated Depreciation [Line Items]        
Location Chattanooga, TN      
Initial Cost Land $ 972      
Initial Cost Buildings and Fixtures 8,954      
Gross Amount, Land 972      
Gross Amount, Buildings and Fixtures 15,314      
Total [1] 16,286      
Accumulated Depreciation [2] (7,235)      
Net $ 9,051      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1987      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1988      
Wholly Owned Properties - Residential | Hidden Creek | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,360      
Wholly Owned Properties - Residential | Steeplechase        
Real Estate And Accumulated Depreciation [Line Items]        
Location Chattanooga, TN      
Initial Cost Land $ 217      
Initial Cost Buildings and Fixtures 1,957      
Gross Amount, Land 217      
Gross Amount, Buildings and Fixtures 5,470      
Total [1] 5,687      
Accumulated Depreciation [2] (3,822)      
Net $ 1,865      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1986      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1991      
Wholly Owned Properties - Residential | Steeplechase | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,513      
Wholly Owned Properties - Residential | Windridge        
Real Estate And Accumulated Depreciation [Line Items]        
Location Chattanooga, TN      
Initial Cost Land $ 817      
Initial Cost Buildings and Fixtures 7,416      
Gross Amount, Land 817      
Gross Amount, Buildings and Fixtures 11,974      
Total [1] 12,791      
Accumulated Depreciation [2] (8,409)      
Net $ 4,382      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1984      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1997      
Wholly Owned Properties - Residential | Windridge | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,558      
Wholly Owned Properties - Residential | Kirby Station        
Real Estate And Accumulated Depreciation [Line Items]        
Location Memphis, TN      
Initial Cost Land $ 1,148      
Initial Cost Buildings and Fixtures 10,337      
Gross Amount, Land 1,148      
Gross Amount, Buildings and Fixtures 20,993      
Total [1] 22,141      
Accumulated Depreciation [2] (14,910)      
Net $ 7,231      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1978      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | Kirby Station | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 10,656      
Wholly Owned Properties - Residential | Lincoln On Green        
Real Estate And Accumulated Depreciation [Line Items]        
Location Memphis, TN      
Initial Cost Land $ 1,498      
Initial Cost Buildings and Fixtures 20,483      
Gross Amount, Land 1,498      
Gross Amount, Buildings and Fixtures 37,638      
Total [1] 39,136      
Accumulated Depreciation [2] (27,288)      
Net $ 11,848      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1992      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | Lincoln On Green | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 17,155      
Wholly Owned Properties - Residential | Park Estate        
Real Estate And Accumulated Depreciation [Line Items]        
Location Memphis, TN      
Initial Cost Land $ 178      
Initial Cost Buildings and Fixtures 1,141      
Gross Amount, Land 178      
Gross Amount, Buildings and Fixtures 5,240      
Total [1] 5,418      
Accumulated Depreciation [2] (3,950)      
Net $ 1,468      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1974      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1977      
Wholly Owned Properties - Residential | Park Estate | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,099      
Wholly Owned Properties - Residential | Reserve At Dexter Lake        
Real Estate And Accumulated Depreciation [Line Items]        
Location Memphis, TN      
Initial Cost Land $ 1,260      
Initial Cost Buildings and Fixtures 16,043      
Gross Amount, Land 3,407      
Gross Amount, Buildings and Fixtures 58,853      
Total [1] 62,260      
Accumulated Depreciation [2] (28,908)      
Net $ 33,352      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1998      
Wholly Owned Properties - Residential | Reserve At Dexter Lake | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,147      
Wholly Owned Properties - Residential | Reserve At Dexter Lake | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 42,810      
Wholly Owned Properties - Residential | Paddock Club Murfreesboro        
Real Estate And Accumulated Depreciation [Line Items]        
Location Murfreesboro, TN      
Initial Cost Land $ 915      
Initial Cost Buildings and Fixtures 14,774      
Gross Amount, Land 915      
Gross Amount, Buildings and Fixtures 18,550      
Total [1] 19,465      
Accumulated Depreciation [2] (10,187)      
Net $ 9,278      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1998      
Wholly Owned Properties - Residential | Paddock Club Murfreesboro | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,776      
Wholly Owned Properties - Residential | Acklen West End        
Real Estate And Accumulated Depreciation [Line Items]        
Location Nashville, TN      
Initial Cost Land $ 12,761      
Initial Cost Buildings and Fixtures 58,906      
Gross Amount, Land 12,761      
Gross Amount, Buildings and Fixtures 59,967      
Total [1] 72,728      
Accumulated Depreciation [2] (4,369)      
Net $ 68,359      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2015      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2017      
Wholly Owned Properties - Residential | Acklen West End | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,061      
Wholly Owned Properties - Residential | Aventura At Indian Lake Village        
Real Estate And Accumulated Depreciation [Line Items]        
Location Nashville, TN      
Initial Cost Land $ 4,950      
Initial Cost Buildings and Fixtures 28,053      
Gross Amount, Land 4,950      
Gross Amount, Buildings and Fixtures 30,199      
Total [1] 35,149      
Accumulated Depreciation [2] (8,800)      
Net $ 26,349      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2010      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2011      
Wholly Owned Properties - Residential | Aventura At Indian Lake Village | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,146      
Wholly Owned Properties - Residential | Avondale At Kennesaw        
Real Estate And Accumulated Depreciation [Line Items]        
Location Nashville, TN      
Encumbrances $ 16,110      
Initial Cost Land 3,456      
Initial Cost Buildings and Fixtures 22,443      
Gross Amount, Land 3,456      
Gross Amount, Buildings and Fixtures 25,827      
Total [1] 29,283      
Accumulated Depreciation [2] (8,530)      
Net $ 20,753      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2010      
Wholly Owned Properties - Residential | Avondale At Kennesaw | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,384      
Wholly Owned Properties - Residential | Brentwood Downs        
Real Estate And Accumulated Depreciation [Line Items]        
Location Nashville, TN      
Initial Cost Land $ 1,193      
Initial Cost Buildings and Fixtures 10,739      
Gross Amount, Land 1,191      
Gross Amount, Buildings and Fixtures 19,657      
Total [1] 20,848      
Accumulated Depreciation [2] (12,910)      
Net $ 7,938      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1986      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | Brentwood Downs | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ (2)      
Wholly Owned Properties - Residential | Brentwood Downs | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 8,918      
Wholly Owned Properties - Residential | Charlotteat M Idtown        
Real Estate And Accumulated Depreciation [Line Items]        
Location Nashville, TN      
Initial Cost Land $ 7,898      
Initial Cost Buildings and Fixtures 54,480      
Gross Amount, Land 7,898      
Gross Amount, Buildings and Fixtures 55,526      
Total [1] 63,424      
Accumulated Depreciation [2] (4,452)      
Net $ 58,972      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2016      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2017      
Wholly Owned Properties - Residential | Charlotteat M Idtown | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,046      
Wholly Owned Properties - Residential | Colonial Grand At Bellevue        
Real Estate And Accumulated Depreciation [Line Items]        
Location Nashville, TN      
Encumbrances $ 19,654      
Initial Cost Land 17,278      
Initial Cost Buildings and Fixtures 64,196      
Gross Amount, Land 17,276      
Gross Amount, Buildings and Fixtures 68,995      
Total [1] 86,271      
Accumulated Depreciation [2] (14,544)      
Net $ 71,727      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Bellevue | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
Wholly Owned Properties - Residential | Colonial Grand At Bellevue | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2015      
Wholly Owned Properties - Residential | Colonial Grand At Bellevue | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ (2)      
Wholly Owned Properties - Residential | Colonial Grand At Bellevue | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,799      
Wholly Owned Properties - Residential | Grand View Nashville        
Real Estate And Accumulated Depreciation [Line Items]        
Location Nashville, TN      
Initial Cost Land $ 2,963      
Initial Cost Buildings and Fixtures 33,673      
Gross Amount, Land 2,963      
Gross Amount, Buildings and Fixtures 42,440      
Total [1] 45,403      
Accumulated Depreciation [2] (21,265)      
Net $ 24,138      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2001      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1998      
Wholly Owned Properties - Residential | Grand View Nashville | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 8,767      
Wholly Owned Properties - Residential | Monthaven Park        
Real Estate And Accumulated Depreciation [Line Items]        
Location Nashville, TN      
Initial Cost Land $ 2,736      
Initial Cost Buildings and Fixtures 28,902      
Gross Amount, Land 2,736      
Gross Amount, Buildings and Fixtures 35,045      
Total [1] 37,781      
Accumulated Depreciation [2] (18,873)      
Net $ 18,908      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2004      
Wholly Owned Properties - Residential | Monthaven Park | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,143      
Wholly Owned Properties - Residential | Park At Hermitage        
Real Estate And Accumulated Depreciation [Line Items]        
Location Nashville, TN      
Initial Cost Land $ 1,524      
Initial Cost Buildings and Fixtures 14,800      
Gross Amount, Land 1,524      
Gross Amount, Buildings and Fixtures 24,296      
Total [1] 25,820      
Accumulated Depreciation [2] (18,141)      
Net $ 7,679      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1987      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1995      
Wholly Owned Properties - Residential | Park At Hermitage | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 9,496      
Wholly Owned Properties - Residential | Venue At Cool Springs        
Real Estate And Accumulated Depreciation [Line Items]        
Location Nashville, TN      
Initial Cost Land $ 6,670      
Gross Amount, Land 6,670      
Gross Amount, Buildings and Fixtures 52,305      
Total [1] 58,975      
Accumulated Depreciation [2] (10,230)      
Net $ 48,745      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2012      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2010      
Wholly Owned Properties - Residential | Venue At Cool Springs | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 52,305      
Wholly Owned Properties - Residential | Verandas At Sam Ridley        
Real Estate And Accumulated Depreciation [Line Items]        
Location Nashville, TN      
Encumbrances $ 19,828      
Initial Cost Land 3,350      
Initial Cost Buildings and Fixtures 28,308      
Gross Amount, Land 3,350      
Gross Amount, Buildings and Fixtures 31,356      
Total [1] 34,706      
Accumulated Depreciation [2] (10,201)      
Net $ 24,505      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2010      
Wholly Owned Properties - Residential | Verandas At Sam Ridley | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,048      
Wholly Owned Properties - Residential | Balcones Woods        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 1,598      
Initial Cost Buildings and Fixtures 14,398      
Gross Amount, Land 1,598      
Gross Amount, Buildings and Fixtures 24,433      
Total [1] 26,031      
Accumulated Depreciation [2] (17,071)      
Net $ 8,960      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1983      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1997      
Wholly Owned Properties - Residential | Balcones Woods | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 10,035      
Wholly Owned Properties - Residential | Colonial Grand At Canyon Creek Austin Tx        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 3,621      
Initial Cost Buildings and Fixtures 32,137      
Gross Amount, Land 3,621      
Gross Amount, Buildings and Fixtures 34,102      
Total [1] 37,723      
Accumulated Depreciation [2] (9,409)      
Net $ 28,314      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Canyon Creek Austin Tx | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,965      
Wholly Owned Properties - Residential | Colonial Grand At Canyon Ranch        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 3,778      
Initial Cost Buildings and Fixtures 20,201      
Gross Amount, Land 3,778      
Gross Amount, Buildings and Fixtures 22,578      
Total [1] 26,356      
Accumulated Depreciation [2] (6,907)      
Net $ 19,449      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2003      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Canyon Ranch | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,377      
Wholly Owned Properties - Residential | Colonial Grand At Double Creek Austin Tx        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 3,131      
Initial Cost Buildings and Fixtures 29,375      
Gross Amount, Land 3,131      
Gross Amount, Buildings and Fixtures 30,425      
Total [1] 33,556      
Accumulated Depreciation [2] (8,413)      
Net $ 25,143      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Double Creek Austin Tx | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,050      
Wholly Owned Properties - Residential | Colonial Grand At Onion Creek        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 4,902      
Initial Cost Buildings and Fixtures 33,010      
Gross Amount, Land 4,902      
Gross Amount, Buildings and Fixtures 35,287      
Total [1] 40,189      
Accumulated Depreciation [2] (9,883)      
Net $ 30,306      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Onion Creek | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,277      
Wholly Owned Properties - Residential | Grand Reserve At Sunset Valley        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 3,150      
Initial Cost Buildings and Fixtures 11,393      
Gross Amount, Land 3,150      
Gross Amount, Buildings and Fixtures 15,270      
Total [1] 18,420      
Accumulated Depreciation [2] (7,842)      
Net $ 10,578      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2004      
Wholly Owned Properties - Residential | Grand Reserve At Sunset Valley | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,877      
Wholly Owned Properties - Residential | Colonial Village At Quarry Oaks        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 4,621      
Initial Cost Buildings and Fixtures 34,461      
Gross Amount, Land 4,621      
Gross Amount, Buildings and Fixtures 40,907      
Total [1] 45,528      
Accumulated Depreciation [2] (12,562)      
Net $ 32,966      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Quarry Oaks | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,446      
Wholly Owned Properties - Residential | Colonial Grand At Wells Branch        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 3,094      
Initial Cost Buildings and Fixtures 32,283      
Gross Amount, Land 3,388      
Gross Amount, Buildings and Fixtures 34,148      
Total [1] 37,536      
Accumulated Depreciation [2] (8,933)      
Net $ 28,603      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Wells Branch | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 294      
Wholly Owned Properties - Residential | Colonial Grand At Wells Branch | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,865      
Wholly Owned Properties - Residential | Legacy At Western Oaks        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 9,100      
Initial Cost Buildings and Fixtures 49,339      
Gross Amount, Land 9,100      
Gross Amount, Buildings and Fixtures 50,433      
Total [1] 59,533      
Accumulated Depreciation [2] (13,984)      
Net $ 45,549      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2001      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2009      
Wholly Owned Properties - Residential | Legacy At Western Oaks | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,094      
Wholly Owned Properties - Residential | Post Barton Creek        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 8,683      
Initial Cost Buildings and Fixtures 21,497      
Gross Amount, Land 8,683      
Gross Amount, Buildings and Fixtures 22,740      
Total [1] 31,423      
Accumulated Depreciation [2] (3,159)      
Net $ 28,264      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Barton Creek | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,243      
Wholly Owned Properties - Residential | Post Park Mesa        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 4,653      
Initial Cost Buildings and Fixtures 19,828      
Gross Amount, Land 4,653      
Gross Amount, Buildings and Fixtures 20,777      
Total [1] 25,430      
Accumulated Depreciation [2] (2,527)      
Net $ 22,903      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1992      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Park Mesa | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 949      
Wholly Owned Properties - Residential | Post South Lamar        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 11,542      
Initial Cost Buildings and Fixtures 41,293      
Gross Amount, Land 11,542      
Gross Amount, Buildings and Fixtures 43,474      
Total [1] 55,016      
Accumulated Depreciation [2] (6,450)      
Net $ 48,566      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2011      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post South Lamar | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,181      
Wholly Owned Properties - Residential | Post South Lamar I I        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 9,000      
Initial Cost Buildings and Fixtures 32,800      
Gross Amount, Land 9,000      
Gross Amount, Buildings and Fixtures 52,930      
Total [1] 61,930      
Accumulated Depreciation [2] (3,724)      
Net $ 58,206      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2017      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post South Lamar I I | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 20,130      
Wholly Owned Properties - Residential | Post West Austin        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 7,805      
Initial Cost Buildings and Fixtures 48,843      
Gross Amount, Land 7,805      
Gross Amount, Buildings and Fixtures 50,266      
Total [1] 58,071      
Accumulated Depreciation [2] (7,403)      
Net $ 50,668      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post West Austin | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,423      
Wholly Owned Properties - Residential | Silverado        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 2,900      
Initial Cost Buildings and Fixtures 24,009      
Gross Amount, Land 2,900      
Gross Amount, Buildings and Fixtures 28,427      
Total [1] 31,327      
Accumulated Depreciation [2] (13,376)      
Net $ 17,951      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2003      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2006      
Wholly Owned Properties - Residential | Silverado | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,418      
Wholly Owned Properties - Residential | Stassney Woods        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 1,621      
Initial Cost Buildings and Fixtures 7,501      
Gross Amount, Land 1,621      
Gross Amount, Buildings and Fixtures 16,120      
Total [1] 17,741      
Accumulated Depreciation [2] (10,746)      
Net $ 6,995      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1985      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1995      
Wholly Owned Properties - Residential | Stassney Woods | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 8,619      
Wholly Owned Properties - Residential | Sixty600        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 2,281      
Initial Cost Buildings and Fixtures 6,169      
Gross Amount, Land 2,281      
Gross Amount, Buildings and Fixtures 14,459      
Total [1] 16,740      
Accumulated Depreciation [2] (9,544)      
Net $ 7,196      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1987      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1995      
Wholly Owned Properties - Residential | Sixty600 | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 8,290      
Wholly Owned Properties - Residential | Woods On Barton Skyway        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 1,405      
Initial Cost Buildings and Fixtures 12,769      
Gross Amount, Land 1,405      
Gross Amount, Buildings and Fixtures 23,013      
Total [1] 24,418      
Accumulated Depreciation [2] (11,343)      
Net $ 13,075      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1977      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1997      
Wholly Owned Properties - Residential | Woods On Barton Skyway | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 10,244      
Wholly Owned Properties - Residential | Colonial Village At Shoal Creek        
Real Estate And Accumulated Depreciation [Line Items]        
Location Bedford, TX      
Initial Cost Land $ 4,982      
Initial Cost Buildings and Fixtures 27,377      
Gross Amount, Land 4,982      
Gross Amount, Buildings and Fixtures 31,401      
Total [1] 36,383      
Accumulated Depreciation [2] (9,230)      
Net $ 27,153      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Shoal Creek | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,024      
Wholly Owned Properties - Residential | Colonial Village At Willow Creek        
Real Estate And Accumulated Depreciation [Line Items]        
Location Bedford, TX      
Initial Cost Land $ 3,109      
Initial Cost Buildings and Fixtures 33,488      
Gross Amount, Land 3,109      
Gross Amount, Buildings and Fixtures 41,711      
Total [1] 44,820      
Accumulated Depreciation [2] (12,218)      
Net $ 32,602      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Willow Creek | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 8,223      
Wholly Owned Properties - Residential | Colonial Grand At Hebron        
Real Estate And Accumulated Depreciation [Line Items]        
Location Carrollton, TX      
Initial Cost Land $ 4,231      
Initial Cost Buildings and Fixtures 42,237      
Gross Amount, Land 4,231      
Gross Amount, Buildings and Fixtures 43,749      
Total [1] 47,980      
Accumulated Depreciation [2] (10,937)      
Net $ 37,043      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2011      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Hebron | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,512      
Wholly Owned Properties - Residential | Colonial Grand At Silverado        
Real Estate And Accumulated Depreciation [Line Items]        
Location Cedar Park, TX      
Initial Cost Land $ 3,282      
Initial Cost Buildings and Fixtures 24,935      
Gross Amount, Land 3,282      
Gross Amount, Buildings and Fixtures 26,510      
Total [1] 29,792      
Accumulated Depreciation [2] (7,245)      
Net $ 22,547      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2005      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Silverado | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,575      
Wholly Owned Properties - Residential | Colonial Grand At Silverado Reserve        
Real Estate And Accumulated Depreciation [Line Items]        
Location Cedar Park, TX      
Initial Cost Land $ 3,951      
Initial Cost Buildings and Fixtures 31,705      
Gross Amount, Land 3,951      
Gross Amount, Buildings and Fixtures 33,961      
Total [1] 37,912      
Accumulated Depreciation [2] (9,071)      
Net $ 28,841      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2005      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Silverado Reserve | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,256      
Wholly Owned Properties - Residential | Grand Cypress        
Real Estate And Accumulated Depreciation [Line Items]        
Location Cypress, TX      
Initial Cost Land $ 3,881      
Initial Cost Buildings and Fixtures 24,267      
Gross Amount, Land 3,881      
Gross Amount, Buildings and Fixtures 25,804      
Total [1] 29,685      
Accumulated Depreciation [2] (5,539)      
Net $ 24,146      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Grand Cypress | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,537      
Wholly Owned Properties - Residential | Courtyards at Campbell        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 988      
Initial Cost Buildings and Fixtures 8,893      
Gross Amount, Land 988      
Gross Amount, Buildings and Fixtures 13,059      
Total [1] 14,047      
Accumulated Depreciation [2] (8,952)      
Net $ 5,095      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1986      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1998      
Wholly Owned Properties - Residential | Courtyards at Campbell | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,166      
Wholly Owned Properties - Residential | Deer Run        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 1,252      
Initial Cost Buildings and Fixtures 11,271      
Gross Amount, Land 1,252      
Gross Amount, Buildings and Fixtures 16,324      
Total [1] 17,576      
Accumulated Depreciation [2] (11,455)      
Net $ 6,121      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1985      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1998      
Wholly Owned Properties - Residential | Deer Run | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,053      
Wholly Owned Properties - Residential | Grand Courtyard        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 2,730      
Initial Cost Buildings and Fixtures 22,240      
Gross Amount, Land 2,730      
Gross Amount, Buildings and Fixtures 26,909      
Total [1] 29,639      
Accumulated Depreciation [2] (12,285)      
Net $ 17,354      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2006      
Wholly Owned Properties - Residential | Grand Courtyard | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,669      
Wholly Owned Properties - Residential | Legends at Lowe's Farm        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 5,016      
Initial Cost Buildings and Fixtures 41,091      
Gross Amount, Land 5,016      
Gross Amount, Buildings and Fixtures 43,935      
Total [1] 48,951      
Accumulated Depreciation [2] (13,043)      
Net $ 35,908      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2011      
Wholly Owned Properties - Residential | Legends at Lowe's Farm | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,844      
Wholly Owned Properties - Residential | Colonial Reserve At Medical District        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 4,050      
Initial Cost Buildings and Fixtures 33,779      
Gross Amount, Land 4,050      
Gross Amount, Buildings and Fixtures 36,319      
Total [1] 40,369      
Accumulated Depreciation [2] (8,655)      
Net $ 31,714      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2007      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Reserve At Medical District | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,540      
Wholly Owned Properties - Residential | Post Abbey        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 2,711      
Initial Cost Buildings and Fixtures 4,369      
Gross Amount, Land 2,711      
Gross Amount, Buildings and Fixtures 4,651      
Total [1] 7,362      
Accumulated Depreciation [2] (588)      
Net $ 6,774      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Abbey | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 282      
Wholly Owned Properties - Residential | Post Addison Circle        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 12,308      
Initial Cost Buildings and Fixtures 189,419      
Gross Amount, Land 12,308      
Gross Amount, Buildings and Fixtures 200,749      
Total [1] 213,057      
Accumulated Depreciation [2] (24,380)      
Net $ 188,677      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Addison Circle | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
Wholly Owned Properties - Residential | Post Addison Circle | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
Wholly Owned Properties - Residential | Post Addison Circle | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 11,330      
Wholly Owned Properties - Residential | Post Cole's Corner        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 13,030      
Initial Cost Buildings and Fixtures 14,383      
Gross Amount, Land 13,030      
Gross Amount, Buildings and Fixtures 16,777      
Total [1] 29,807      
Accumulated Depreciation [2] (2,354)      
Net $ 27,453      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Cole's Corner | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,394      
Wholly Owned Properties - Residential | Post Eastside        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 7,134      
Initial Cost Buildings and Fixtures 58,095      
Gross Amount, Land 7,134      
Gross Amount, Buildings and Fixtures 59,308      
Total [1] 66,442      
Accumulated Depreciation [2] (7,908)      
Net $ 58,534      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Eastside | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,213      
Wholly Owned Properties - Residential | Post Gallery        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 4,391      
Initial Cost Buildings and Fixtures 7,910      
Gross Amount, Land 4,391      
Gross Amount, Buildings and Fixtures 8,804      
Total [1] 13,195      
Accumulated Depreciation [2] (1,349)      
Net $ 11,846      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Gallery | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 894      
Wholly Owned Properties - Residential | Post Heights        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 26,245      
Initial Cost Buildings and Fixtures 37,922      
Gross Amount, Land 26,245      
Gross Amount, Buildings and Fixtures 39,082      
Total [1] 65,327      
Accumulated Depreciation [2] (5,198)      
Net $ 60,129      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Heights | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
Wholly Owned Properties - Residential | Post Heights | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
Wholly Owned Properties - Residential | Post Heights | Phase III [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
Wholly Owned Properties - Residential | Post Heights | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,160      
Wholly Owned Properties - Residential | Post Katy Trail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 10,333      
Initial Cost Buildings and Fixtures 32,456      
Gross Amount, Land 10,333      
Gross Amount, Buildings and Fixtures 33,275      
Total [1] 43,608      
Accumulated Depreciation [2] (3,806)      
Net $ 39,802      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2010      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Katy Trail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 819      
Wholly Owned Properties - Residential | Post Legacy        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 6,575      
Initial Cost Buildings and Fixtures 55,277      
Gross Amount, Land 6,575      
Gross Amount, Buildings and Fixtures 58,907      
Total [1] 65,482      
Accumulated Depreciation [2] (7,083)      
Net $ 58,399      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Legacy | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,630      
Wholly Owned Properties - Residential | Post Meridian        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 8,780      
Initial Cost Buildings and Fixtures 13,654      
Gross Amount, Land 8,780      
Gross Amount, Buildings and Fixtures 14,081      
Total [1] 22,861      
Accumulated Depreciation [2] (1,921)      
Net $ 20,940      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1991      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Meridian | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 427      
Wholly Owned Properties - Residential | Post Sierra At Frisco Bridges        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 6,777      
Initial Cost Buildings and Fixtures 32,553      
Gross Amount, Land 6,777      
Gross Amount, Buildings and Fixtures 33,383      
Total [1] 40,160      
Accumulated Depreciation [2] (4,943)      
Net $ 35,217      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Sierra At Frisco Bridges | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 830      
Wholly Owned Properties - Residential | Post Square        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 13,178      
Initial Cost Buildings and Fixtures 24,048      
Gross Amount, Land 13,178      
Gross Amount, Buildings and Fixtures 26,107      
Total [1] 39,285      
Accumulated Depreciation [2] (3,124)      
Net $ 36,161      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Square | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,059      
Wholly Owned Properties - Residential | Post Uptown Village        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 34,974      
Initial Cost Buildings and Fixtures 33,213      
Gross Amount, Land 34,974      
Gross Amount, Buildings and Fixtures 37,754      
Total [1] 72,728      
Accumulated Depreciation [2] (5,119)      
Net $ 67,609      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Uptown Village | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1995      
Wholly Owned Properties - Residential | Post Uptown Village | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
Wholly Owned Properties - Residential | Post Uptown Village | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,541      
Wholly Owned Properties - Residential | Post Vineyard        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 7,966      
Initial Cost Buildings and Fixtures 7,471      
Gross Amount, Land 7,966      
Gross Amount, Buildings and Fixtures 8,511      
Total [1] 16,477      
Accumulated Depreciation [2] (1,097)      
Net $ 15,380      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Vineyard | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,040      
Wholly Owned Properties - Residential | Post Vintage        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 13,621      
Initial Cost Buildings and Fixtures 8,608      
Gross Amount, Land 13,621      
Gross Amount, Buildings and Fixtures 10,125      
Total [1] 23,746      
Accumulated Depreciation [2] (1,366)      
Net $ 22,380      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1993      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Vintage | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,517      
Wholly Owned Properties - Residential | Post Worthington        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 13,713      
Initial Cost Buildings and Fixtures 43,268      
Gross Amount, Land 13,713      
Gross Amount, Buildings and Fixtures 44,820      
Total [1] 58,533      
Accumulated Depreciation [2] (5,426)      
Net $ 53,107      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Worthington | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1993      
Wholly Owned Properties - Residential | Post Worthington | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
Wholly Owned Properties - Residential | Post Worthington | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,552      
Wholly Owned Properties - Residential | Watermark        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 960      
Initial Cost Buildings and Fixtures 14,438      
Gross Amount, Land 960      
Gross Amount, Buildings and Fixtures 17,568      
Total [1] 18,528      
Accumulated Depreciation [2] (9,253)      
Net $ 9,275      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2002      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2004      
Wholly Owned Properties - Residential | Watermark | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,130      
Wholly Owned Properties - Residential | Colonial Grand At Bear Creek        
Real Estate And Accumulated Depreciation [Line Items]        
Location Euless, TX      
Initial Cost Land $ 6,453      
Initial Cost Buildings and Fixtures 30,048      
Gross Amount, Land 6,453      
Gross Amount, Buildings and Fixtures 33,247      
Total [1] 39,700      
Accumulated Depreciation [2] (10,099)      
Net $ 29,601      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Bear Creek | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,199      
Wholly Owned Properties - Residential | Colonial Grand At Fairview [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Fairview, TX      
Initial Cost Land $ 2,171      
Initial Cost Buildings and Fixtures 35,077      
Gross Amount, Land 2,171      
Gross Amount, Buildings and Fixtures 36,238      
Total [1] 38,409      
Accumulated Depreciation [2] (8,941)      
Net $ 29,468      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2012      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Fairview [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,161      
Wholly Owned Properties - Residential | La Valencia At Starwood        
Real Estate And Accumulated Depreciation [Line Items]        
Location Frisco, TX      
Initial Cost Land $ 3,240      
Initial Cost Buildings and Fixtures 26,069      
Gross Amount, Land 3,240      
Gross Amount, Buildings and Fixtures 27,920      
Total [1] 31,160      
Accumulated Depreciation [2] (9,131)      
Net $ 22,029      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2010      
Wholly Owned Properties - Residential | La Valencia At Starwood | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,851      
Wholly Owned Properties - Residential | Colonial Reserve At Frisco Bridges        
Real Estate And Accumulated Depreciation [Line Items]        
Location Frisco, TX      
Initial Cost Land $ 1,968      
Initial Cost Buildings and Fixtures 34,018      
Gross Amount, Land 1,968      
Gross Amount, Buildings and Fixtures 35,660      
Total [1] 37,628      
Accumulated Depreciation [2] (8,643)      
Net $ 28,985      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Reserve At Frisco Bridges | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,642      
Wholly Owned Properties - Residential | Colonial Village At Grapevine        
Real Estate And Accumulated Depreciation [Line Items]        
Location Grapevine, TX      
Initial Cost Land $ 2,351      
Initial Cost Buildings and Fixtures 29,757      
Gross Amount, Land 2,351      
Gross Amount, Buildings and Fixtures 36,222      
Total [1] 38,573      
Accumulated Depreciation [2] (10,022)      
Net $ 28,551      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Grapevine | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1985      
Wholly Owned Properties - Residential | Colonial Village At Grapevine | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1986      
Wholly Owned Properties - Residential | Colonial Village At Grapevine | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,465      
Wholly Owned Properties - Residential | Greenwood Forest        
Real Estate And Accumulated Depreciation [Line Items]        
Location Houston, TX      
Initial Cost Land $ 3,465      
Initial Cost Buildings and Fixtures 23,482      
Gross Amount, Land 3,465      
Gross Amount, Buildings and Fixtures 24,632      
Total [1] 28,097      
Accumulated Depreciation [2] (5,897)      
Net $ 22,200      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1994      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Greenwood Forest | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,150      
Wholly Owned Properties - Residential | Legacy Pines        
Real Estate And Accumulated Depreciation [Line Items]        
Location Houston, TX      
Initial Cost Land $ 2,157      
Initial Cost Buildings and Fixtures 19,066      
Gross Amount, Land 2,142      
Gross Amount, Buildings and Fixtures 23,236      
Total [1] 25,378      
Accumulated Depreciation [2] (12,904)      
Net $ 12,474      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2003      
Wholly Owned Properties - Residential | Legacy Pines | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ (15)      
Wholly Owned Properties - Residential | Legacy Pines | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,170      
Wholly Owned Properties - Residential | Park Place Houston        
Real Estate And Accumulated Depreciation [Line Items]        
Location Houston, TX      
Initial Cost Land $ 2,061      
Initial Cost Buildings and Fixtures 15,830      
Gross Amount, Land 2,061      
Gross Amount, Buildings and Fixtures 19,094      
Total [1] 21,155      
Accumulated Depreciation [2] (8,596)      
Net $ 12,559      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2007      
Wholly Owned Properties - Residential | Park Place Houston | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,264      
Wholly Owned Properties - Residential | Post Midtown Square        
Real Estate And Accumulated Depreciation [Line Items]        
Location Houston, TX      
Initial Cost Land $ 19,038      
Initial Cost Buildings and Fixtures 89,570      
Gross Amount, Land 19,038      
Gross Amount, Buildings and Fixtures 92,172      
Total [1] 111,210      
Accumulated Depreciation [2] (11,984)      
Net $ 99,226      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Midtown Square | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
Wholly Owned Properties - Residential | Post Midtown Square | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
Wholly Owned Properties - Residential | Post Midtown Square | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,602      
Wholly Owned Properties - Residential | Post510        
Real Estate And Accumulated Depreciation [Line Items]        
Location Houston, TX      
Initial Cost Land $ 7,227      
Initial Cost Buildings and Fixtures 33,366      
Gross Amount, Land 7,227      
Gross Amount, Buildings and Fixtures 33,792      
Total [1] 41,019      
Accumulated Depreciation [2] (4,713)      
Net $ 36,306      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2014      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post510 | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 426      
Wholly Owned Properties - Residential | Post Afton Oaks        
Real Estate And Accumulated Depreciation [Line Items]        
Location Houston, TX      
Initial Cost Land $ 11,503      
Initial Cost Buildings and Fixtures 65,469      
Gross Amount, Land 11,503      
Gross Amount, Buildings and Fixtures 68,984      
Total [1] 80,487      
Accumulated Depreciation [2] (10,736)      
Net $ 69,751      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2017      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Afton Oaks | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,515      
Wholly Owned Properties - Residential | Ranchstone        
Real Estate And Accumulated Depreciation [Line Items]        
Location Houston, TX      
Initial Cost Land $ 1,480      
Initial Cost Buildings and Fixtures 14,807      
Gross Amount, Land 1,480      
Gross Amount, Buildings and Fixtures 17,748      
Total [1] 19,228      
Accumulated Depreciation [2] (7,772)      
Net $ 11,456      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2007      
Wholly Owned Properties - Residential | Ranchstone | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,941      
Wholly Owned Properties - Residential | Reserve At Woodwind Lakes        
Real Estate And Accumulated Depreciation [Line Items]        
Location Houston, TX      
Initial Cost Land $ 1,968      
Initial Cost Buildings and Fixtures 19,928      
Gross Amount, Land 1,968      
Gross Amount, Buildings and Fixtures 24,127      
Total [1] 26,095      
Accumulated Depreciation [2] (11,050)      
Net $ 15,045      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2006      
Wholly Owned Properties - Residential | Reserve At Woodwind Lakes | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,199      
Wholly Owned Properties - Residential | Retreat At Vintage Park        
Real Estate And Accumulated Depreciation [Line Items]        
Location Houston, TX      
Initial Cost Land $ 8,211      
Initial Cost Buildings and Fixtures 40,352      
Gross Amount, Land 8,211      
Gross Amount, Buildings and Fixtures 41,444      
Total [1] 49,655      
Accumulated Depreciation [2] (5,573)      
Net $ 44,082      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2014      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2014      
Wholly Owned Properties - Residential | Retreat At Vintage Park | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,092      
Wholly Owned Properties - Residential | Yale At6th        
Real Estate And Accumulated Depreciation [Line Items]        
Location Houston, TX      
Initial Cost Land $ 13,107      
Initial Cost Buildings and Fixtures 62,764      
Gross Amount, Land 13,107      
Gross Amount, Buildings and Fixtures 64,109      
Total [1] 77,216      
Accumulated Depreciation [2] (6,319)      
Net $ 70,897      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2015      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Yale At6th | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,345      
Wholly Owned Properties - Residential | Cascade At Fall Creek        
Real Estate And Accumulated Depreciation [Line Items]        
Location Humble, TX      
Initial Cost Land $ 5,985      
Initial Cost Buildings and Fixtures 40,011      
Gross Amount, Land 5,985      
Gross Amount, Buildings and Fixtures 43,323      
Total [1] 49,308      
Accumulated Depreciation [2] (17,998)      
Net $ 31,310      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2007      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2007      
Wholly Owned Properties - Residential | Cascade At Fall Creek | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,312      
Wholly Owned Properties - Residential | Bella Casita        
Real Estate And Accumulated Depreciation [Line Items]        
Location Irving, TX      
Initial Cost Land $ 2,521      
Initial Cost Buildings and Fixtures 26,432      
Gross Amount, Land 2,521      
Gross Amount, Buildings and Fixtures 28,992      
Total [1] 31,513      
Accumulated Depreciation [2] (9,293)      
Net $ 22,220      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2007      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2010      
Wholly Owned Properties - Residential | Bella Casita | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,560      
Wholly Owned Properties - Residential | Remington Hills        
Real Estate And Accumulated Depreciation [Line Items]        
Location Irving, TX      
Initial Cost Land $ 4,390      
Initial Cost Buildings and Fixtures 21,822      
Gross Amount, Land 4,390      
Gross Amount, Buildings and Fixtures 34,100      
Total [1] 38,490      
Accumulated Depreciation [2] (9,256)      
Net $ 29,234      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1984      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Remington Hills | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 12,278      
Wholly Owned Properties - Residential | Colonial Reserve At Las Colinas        
Real Estate And Accumulated Depreciation [Line Items]        
Location Irving, TX      
Initial Cost Land $ 3,902      
Initial Cost Buildings and Fixtures 40,691      
Gross Amount, Land 3,902      
Gross Amount, Buildings and Fixtures 42,572      
Total [1] 46,474      
Accumulated Depreciation [2] (10,301)      
Net $ 36,173      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2006      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Reserve At Las Colinas | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,881      
Wholly Owned Properties - Residential | Colonial Grand At Valley Ranch        
Real Estate And Accumulated Depreciation [Line Items]        
Location Irving, TX      
Encumbrances $ 22,286      
Initial Cost Land 5,072      
Initial Cost Buildings and Fixtures 37,397      
Gross Amount, Land 5,072      
Gross Amount, Buildings and Fixtures 50,554      
Total [1] 55,626      
Accumulated Depreciation [2] (14,925)      
Net $ 40,701      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Valley Ranch | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 13,157      
Wholly Owned Properties - Residential | Colonial Village At Oakbend        
Real Estate And Accumulated Depreciation [Line Items]        
Location Lewisville, TX      
Initial Cost Land $ 5,598      
Initial Cost Buildings and Fixtures 28,616      
Gross Amount, Land 5,598      
Gross Amount, Buildings and Fixtures 33,625      
Total [1] 39,223      
Accumulated Depreciation [2] (9,544)      
Net $ 29,679      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Oakbend | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,009      
Wholly Owned Properties - Residential | Times Square At Craig Ranch        
Real Estate And Accumulated Depreciation [Line Items]        
Location McKinney, TX      
Initial Cost Land $ 1,130      
Initial Cost Buildings and Fixtures 28,058      
Gross Amount, Land 1,130      
Gross Amount, Buildings and Fixtures 32,827      
Total [1] 33,957      
Accumulated Depreciation [2] (11,196)      
Net $ 22,761      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2010      
Wholly Owned Properties - Residential | Times Square At Craig Ranch | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,769      
Wholly Owned Properties - Residential | Venue At Stonebridge Ranch        
Real Estate And Accumulated Depreciation [Line Items]        
Location McKinney, TX      
Initial Cost Land $ 4,034      
Initial Cost Buildings and Fixtures 19,528      
Gross Amount, Land 4,034      
Gross Amount, Buildings and Fixtures 21,269      
Total [1] 25,303      
Accumulated Depreciation [2] (4,668)      
Net $ 20,635      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Venue At Stonebridge Ranch | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,741      
Wholly Owned Properties - Residential | Cityscape At Market Center        
Real Estate And Accumulated Depreciation [Line Items]        
Location Plano, TX      
Initial Cost Land $ 16,894      
Initial Cost Buildings and Fixtures 110,705      
Gross Amount, Land 16,894      
Gross Amount, Buildings and Fixtures 113,197      
Total [1] 130,091      
Accumulated Depreciation [2] (14,691)      
Net $ 115,400      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2014      
Wholly Owned Properties - Residential | Cityscape At Market Center | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
Wholly Owned Properties - Residential | Cityscape At Market Center | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2015      
Wholly Owned Properties - Residential | Cityscape At Market Center | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,492      
Wholly Owned Properties - Residential | Highwood        
Real Estate And Accumulated Depreciation [Line Items]        
Location Plano, TX      
Initial Cost Land $ 864      
Initial Cost Buildings and Fixtures 7,783      
Gross Amount, Land 864      
Gross Amount, Buildings and Fixtures 11,414      
Total [1] 12,278      
Accumulated Depreciation [2] (7,893)      
Net $ 4,385      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1983      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1998      
Wholly Owned Properties - Residential | Highwood | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,631      
Wholly Owned Properties - Residential | Los Rios Park        
Real Estate And Accumulated Depreciation [Line Items]        
Location Plano, TX      
Initial Cost Land $ 3,273      
Initial Cost Buildings and Fixtures 28,823      
Gross Amount, Land 3,273      
Gross Amount, Buildings and Fixtures 35,744      
Total [1] 39,017      
Accumulated Depreciation [2] (19,360)      
Net $ 19,657      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2003      
Wholly Owned Properties - Residential | Los Rios Park | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,921      
Wholly Owned Properties - Residential | Boulder Ridge        
Real Estate And Accumulated Depreciation [Line Items]        
Location Roanoke, TX      
Initial Cost Land $ 3,382      
Initial Cost Buildings and Fixtures 26,930      
Gross Amount, Land 3,382      
Gross Amount, Buildings and Fixtures 33,955      
Total [1] 37,337      
Accumulated Depreciation [2] (16,567)      
Net $ 20,770      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2005      
Wholly Owned Properties - Residential | Boulder Ridge | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 7,025      
Wholly Owned Properties - Residential | Copper Ridge        
Real Estate And Accumulated Depreciation [Line Items]        
Location Roanoke, TX      
Initial Cost Land $ 3,336      
Gross Amount, Land 3,336      
Gross Amount, Buildings and Fixtures 21,806      
Total [1] 25,142      
Accumulated Depreciation [2] (6,506)      
Net $ 18,636      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2008      
Wholly Owned Properties - Residential | Copper Ridge | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 21,806      
Wholly Owned Properties - Residential | Colonial Grand At Ashton Oaks        
Real Estate And Accumulated Depreciation [Line Items]        
Location Round Rock, TX      
Initial Cost Land $ 5,511      
Initial Cost Buildings and Fixtures 36,241      
Gross Amount, Land 5,511      
Gross Amount, Buildings and Fixtures 38,617      
Total [1] 44,128      
Accumulated Depreciation [2] (10,589)      
Net $ 33,539      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Ashton Oaks | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,376      
Wholly Owned Properties - Residential | Colonial Grand At Round Rock        
Real Estate And Accumulated Depreciation [Line Items]        
Location Round Rock, TX      
Initial Cost Land $ 4,691      
Initial Cost Buildings and Fixtures 45,379      
Gross Amount, Land 4,691      
Gross Amount, Buildings and Fixtures 48,117      
Total [1] 52,808      
Accumulated Depreciation [2] (12,809)      
Net $ 39,999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Grand At Round Rock | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,738      
Wholly Owned Properties - Residential | Colonial Village At Sierra Vista        
Real Estate And Accumulated Depreciation [Line Items]        
Location Round Rock, TX      
Initial Cost Land $ 2,561      
Initial Cost Buildings and Fixtures 16,488      
Gross Amount, Land 2,561      
Gross Amount, Buildings and Fixtures 20,303      
Total [1] 22,864      
Accumulated Depreciation [2] (6,188)      
Net $ 16,676      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Sierra Vista | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,815      
Wholly Owned Properties - Residential | Alamo Ranch        
Real Estate And Accumulated Depreciation [Line Items]        
Location San Antonio, TX      
Initial Cost Land $ 2,380      
Initial Cost Buildings and Fixtures 26,982      
Gross Amount, Land 2,380      
Gross Amount, Buildings and Fixtures 30,008      
Total [1] 32,388      
Accumulated Depreciation [2] (9,674)      
Net $ 22,714      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2011      
Wholly Owned Properties - Residential | Alamo Ranch | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,026      
Wholly Owned Properties - Residential | Bulverde Oaks        
Real Estate And Accumulated Depreciation [Line Items]        
Location San Antonio, TX      
Initial Cost Land $ 4,257      
Initial Cost Buildings and Fixtures 36,759      
Gross Amount, Land 4,257      
Gross Amount, Buildings and Fixtures 38,349      
Total [1] 42,606      
Accumulated Depreciation [2] (5,411)      
Net $ 37,195      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2014      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2014      
Wholly Owned Properties - Residential | Bulverde Oaks | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,590      
Wholly Owned Properties - Residential | Haven At Blanco        
Real Estate And Accumulated Depreciation [Line Items]        
Location San Antonio, TX      
Initial Cost Land $ 5,450      
Initial Cost Buildings and Fixtures 45,958      
Gross Amount, Land 5,450      
Gross Amount, Buildings and Fixtures 49,377      
Total [1] 54,827      
Accumulated Depreciation [2] (13,066)      
Net $ 41,761      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2010      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2012      
Wholly Owned Properties - Residential | Haven At Blanco | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,419      
Wholly Owned Properties - Residential | Stone Ranch At Westover Hills        
Real Estate And Accumulated Depreciation [Line Items]        
Location San Antonio, TX      
Initial Cost Land $ 4,000      
Initial Cost Buildings and Fixtures 24,992      
Gross Amount, Land 4,000      
Gross Amount, Buildings and Fixtures 27,953      
Total [1] 31,953      
Accumulated Depreciation [2] (9,964)      
Net $ 21,989      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2009      
Wholly Owned Properties - Residential | Stone Ranch At Westover Hills | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,961      
Wholly Owned Properties - Residential | Cypresswood Court        
Real Estate And Accumulated Depreciation [Line Items]        
Location Spring, TX      
Initial Cost Land $ 576      
Initial Cost Buildings and Fixtures 5,190      
Gross Amount, Land 576      
Gross Amount, Buildings and Fixtures 10,355      
Total [1] 10,931      
Accumulated Depreciation [2] (6,378)      
Net $ 4,553      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1984      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | Cypresswood Court | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 5,165      
Wholly Owned Properties - Residential | Villages At Kirkwood        
Real Estate And Accumulated Depreciation [Line Items]        
Location Stafford, TX      
Initial Cost Land $ 1,918      
Initial Cost Buildings and Fixtures 15,846      
Gross Amount, Land 1,918      
Gross Amount, Buildings and Fixtures 19,025      
Total [1] 20,943      
Accumulated Depreciation [2] (9,804)      
Net $ 11,139      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2004      
Wholly Owned Properties - Residential | Villages At Kirkwood | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,179      
Wholly Owned Properties - Residential | Green Tree Place        
Real Estate And Accumulated Depreciation [Line Items]        
Location Woodlands, TX      
Initial Cost Land $ 539      
Initial Cost Buildings and Fixtures 4,850      
Gross Amount, Land 539      
Gross Amount, Buildings and Fixtures 8,779      
Total [1] 9,318      
Accumulated Depreciation [2] (6,438)      
Net $ 2,880      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1984      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1994      
Wholly Owned Properties - Residential | Green Tree Place | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,929      
Wholly Owned Properties - Residential | Stonefield Commons        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlottesville, VA      
Initial Cost Land $ 11,044      
Initial Cost Buildings and Fixtures 36,689      
Gross Amount, Land 11,044      
Gross Amount, Buildings and Fixtures 37,882      
Total [1] 48,926      
Accumulated Depreciation [2] (5,561)      
Net $ 43,365      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2014      
Wholly Owned Properties - Residential | Stonefield Commons | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,193      
Wholly Owned Properties - Residential | Adalay Bay        
Real Estate And Accumulated Depreciation [Line Items]        
Location Chesapeake, VA      
Initial Cost Land $ 5,280      
Initial Cost Buildings and Fixtures 31,341      
Gross Amount, Land 5,280      
Gross Amount, Buildings and Fixtures 34,906      
Total [1] 40,186      
Accumulated Depreciation [2] (9,885)      
Net $ 30,301      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2002      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2012      
Wholly Owned Properties - Residential | Adalay Bay | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,565      
Wholly Owned Properties - Residential | Colonial Village At Greenbrier        
Real Estate And Accumulated Depreciation [Line Items]        
Location Fredericksburg, VA      
Initial Cost Land $ 4,842      
Initial Cost Buildings and Fixtures 21,677      
Gross Amount, Land 4,842      
Gross Amount, Buildings and Fixtures 24,226      
Total [1] 29,068      
Accumulated Depreciation [2] (5,977)      
Net $ 23,091      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1980      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Greenbrier | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,549      
Wholly Owned Properties - Residential | Seasons At Celebrate Virginia        
Real Estate And Accumulated Depreciation [Line Items]        
Location Fredericksburg, VA      
Initial Cost Land $ 14,490      
Initial Cost Buildings and Fixtures 32,083      
Gross Amount, Land 14,490      
Gross Amount, Buildings and Fixtures 72,148      
Total [1] 86,638      
Accumulated Depreciation [2] (15,520)      
Net $ 71,118      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2011      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2011      
Wholly Owned Properties - Residential | Seasons At Celebrate Virginia | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 40,065      
Wholly Owned Properties - Residential | Station Square At Cosner's Corner        
Real Estate And Accumulated Depreciation [Line Items]        
Location Fredericksburg, VA      
Initial Cost Land $ 12,825      
Initial Cost Buildings and Fixtures 51,078      
Gross Amount, Land 12,825      
Gross Amount, Buildings and Fixtures 52,729      
Total [1] 65,554      
Accumulated Depreciation [2] (7,962)      
Net $ 57,592      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Station Square At Cosner's Corner | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
Wholly Owned Properties - Residential | Station Square At Cosner's Corner | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2016      
Wholly Owned Properties - Residential | Station Square At Cosner's Corner | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,651      
Wholly Owned Properties - Residential | Apartments At Cobblestone Square        
Real Estate And Accumulated Depreciation [Line Items]        
Location Fredericksburg, VA      
Initial Cost Land $ 10,990      
Initial Cost Buildings and Fixtures 48,696      
Gross Amount, Land 10,990      
Gross Amount, Buildings and Fixtures 51,370      
Total [1] 62,360      
Accumulated Depreciation [2] (7,440)      
Net $ 54,920      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2012      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Apartments At Cobblestone Square | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,674      
Wholly Owned Properties - Residential | Colonial Village At Hampton Glen        
Real Estate And Accumulated Depreciation [Line Items]        
Location Glen Allen, VA      
Initial Cost Land $ 4,851      
Initial Cost Buildings and Fixtures 21,678      
Gross Amount, Land 4,851      
Gross Amount, Buildings and Fixtures 24,944      
Total [1] 29,795      
Accumulated Depreciation [2] (6,757)      
Net $ 23,038      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1986      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Hampton Glen | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,266      
Wholly Owned Properties - Residential | Colonial Village At West End        
Real Estate And Accumulated Depreciation [Line Items]        
Location Glen Allen, VA      
Initial Cost Land $ 4,661      
Initial Cost Buildings and Fixtures 18,908      
Gross Amount, Land 4,661      
Gross Amount, Buildings and Fixtures 21,851      
Total [1] 26,512      
Accumulated Depreciation [2] (5,919)      
Net $ 20,593      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1987      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At West End | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,943      
Wholly Owned Properties - Residential | Township        
Real Estate And Accumulated Depreciation [Line Items]        
Location Hampton, VA      
Initial Cost Land $ 1,509      
Initial Cost Buildings and Fixtures 8,189      
Gross Amount, Land 1,509      
Gross Amount, Buildings and Fixtures 16,852      
Total [1] 18,361      
Accumulated Depreciation [2] (11,425)      
Net $ 6,936      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1987      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 1995      
Wholly Owned Properties - Residential | Township | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 8,663      
Wholly Owned Properties - Residential | Colonial Village At Waterford        
Real Estate And Accumulated Depreciation [Line Items]        
Location Midlothian, VA      
Initial Cost Land $ 6,733      
Initial Cost Buildings and Fixtures 29,221      
Gross Amount, Land 6,733      
Gross Amount, Buildings and Fixtures 33,989      
Total [1] 40,722      
Accumulated Depreciation [2] (9,654)      
Net $ 31,068      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1989      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Colonial Village At Waterford | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 4,768      
Wholly Owned Properties - Residential | Ashley Park        
Real Estate And Accumulated Depreciation [Line Items]        
Location Richmond, VA      
Initial Cost Land $ 4,761      
Initial Cost Buildings and Fixtures 13,365      
Gross Amount, Land 4,761      
Gross Amount, Buildings and Fixtures 15,728      
Total [1] 20,489      
Accumulated Depreciation [2] (4,968)      
Net $ 15,521      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1988      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Wholly Owned Properties - Residential | Ashley Park | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,363      
Wholly Owned Properties - Residential | Post Tysons Corner        
Real Estate And Accumulated Depreciation [Line Items]        
Location Washington D.C.      
Initial Cost Land $ 30,776      
Initial Cost Buildings and Fixtures 82,021      
Gross Amount, Land 30,776      
Gross Amount, Buildings and Fixtures 85,150      
Total [1] 115,926      
Accumulated Depreciation [2] (10,043)      
Net $ 105,883      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1990      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Wholly Owned Properties - Residential | Post Tysons Corner | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,129      
Wholly Owned Properties - Residential | Total Residential Properties        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 145,473      
Initial Cost Land 1,820,078      
Initial Cost Buildings and Fixtures 9,941,939      
Gross Amount, Land 1,825,364      
Gross Amount, Buildings and Fixtures 11,633,410      
Total [1] 13,458,774      
Accumulated Depreciation [2] (2,915,332)      
Net 10,543,442      
Wholly Owned Properties - Residential | Total Residential Properties | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition 5,286      
Wholly Owned Properties - Residential | Total Residential Properties | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,691,471      
Residential Properties | Colonial Village At Chase Gayton        
Real Estate And Accumulated Depreciation [Line Items]        
Location Richmond, VA      
Initial Cost Land $ 6,021      
Initial Cost Buildings and Fixtures 29,004      
Gross Amount, Land 6,021      
Gross Amount, Buildings and Fixtures 32,666      
Total [1] 38,687      
Accumulated Depreciation [2] (9,211)      
Net $ 29,476      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1984      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Residential Properties | Colonial Village At Chase Gayton | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,662      
Residential Properties | Hamptons At Hunton Park        
Real Estate And Accumulated Depreciation [Line Items]        
Location Richmond, VA      
Initial Cost Land $ 4,930      
Initial Cost Buildings and Fixtures 35,598      
Gross Amount, Land 4,930      
Gross Amount, Buildings and Fixtures 41,677      
Total [1] 46,607      
Accumulated Depreciation [2] (12,283)      
Net $ 34,324      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2003      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2011      
Residential Properties | Hamptons At Hunton Park | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,079      
Residential Properties | Retreat At West Creek        
Real Estate And Accumulated Depreciation [Line Items]        
Location Richmond, VA      
Initial Cost Land $ 7,112      
Initial Cost Buildings and Fixtures 36,136      
Gross Amount, Land 7,112      
Gross Amount, Buildings and Fixtures 38,093      
Total [1] 45,205      
Accumulated Depreciation [2] (4,699)      
Net $ 40,506      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2015      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2015      
Residential Properties | Retreat At West Creek | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,957      
Residential Properties | Retreat At West Creek I I        
Real Estate And Accumulated Depreciation [Line Items]        
Location Richmond, VA      
Initial Cost Land $ 3,000      
Gross Amount, Land 3,000      
Gross Amount, Buildings and Fixtures 12,141      
Total [1] 15,141      
Accumulated Depreciation [2] (859)      
Net $ 14,282      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2017      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2015      
Residential Properties | Retreat At West Creek I I | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 12,141      
Residential Properties | Radius        
Real Estate And Accumulated Depreciation [Line Items]        
Location Newport News, VA      
Initial Cost Land $ 5,040      
Initial Cost Buildings and Fixtures 36,481      
Gross Amount, Land 5,040      
Gross Amount, Buildings and Fixtures 39,551      
Total [1] 44,591      
Accumulated Depreciation [2] (4,966)      
Net $ 39,625      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2012      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2015      
Residential Properties | Radius | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,070      
Residential Properties | Post Carlyle Square        
Real Estate And Accumulated Depreciation [Line Items]        
Location Washington D.C.      
Initial Cost Land $ 29,728      
Initial Cost Buildings and Fixtures 154,309      
Gross Amount, Land 29,728      
Gross Amount, Buildings and Fixtures 156,647      
Total [1] 186,375      
Accumulated Depreciation [2] (18,306)      
Net $ 168,069      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Residential Properties | Post Carlyle Square | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2006      
Residential Properties | Post Carlyle Square | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
Residential Properties | Post Carlyle Square | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,338      
Residential Properties | Post Corners At Trinity Center        
Real Estate And Accumulated Depreciation [Line Items]        
Location Washington D.C.      
Initial Cost Land $ 7,664      
Initial Cost Buildings and Fixtures 70,012      
Gross Amount, Land 7,664      
Gross Amount, Buildings and Fixtures 72,023      
Total [1] 79,687      
Accumulated Depreciation [2] (8,487)      
Net $ 71,200      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Residential Properties | Post Corners At Trinity Center | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,011      
Residential Properties | Post Fallsgrove        
Real Estate And Accumulated Depreciation [Line Items]        
Location Washington D.C.      
Initial Cost Land $ 17,524      
Initial Cost Buildings and Fixtures 58,896      
Gross Amount, Land 17,524      
Gross Amount, Buildings and Fixtures 61,679      
Total [1] 79,203      
Accumulated Depreciation [2] (7,557)      
Net $ 71,646      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2003      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Residential Properties | Post Fallsgrove | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,783      
Residential Properties | Post Park        
Real Estate And Accumulated Depreciation [Line Items]        
Location Washington D.C.      
Initial Cost Land $ 5,355      
Initial Cost Buildings and Fixtures 79,842      
Gross Amount, Land 5,355      
Gross Amount, Buildings and Fixtures 81,574      
Total [1] 86,929      
Accumulated Depreciation [2] (12,442)      
Net $ 74,487      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2010      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Residential Properties | Post Park | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,732      
Residential Properties | Post Pentagon Row        
Real Estate And Accumulated Depreciation [Line Items]        
Location Washington D.C.      
Initial Cost Land $ 30,452      
Initial Cost Buildings and Fixtures 125,091      
Gross Amount, Land 30,452      
Gross Amount, Buildings and Fixtures 131,280      
Total [1] 161,732      
Accumulated Depreciation [2] (16,006)      
Net $ 145,726      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2001      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Residential Properties | Post Pentagon Row | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,189      
Retail Properties | Post Training Facility        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 1,092      
Initial Cost Buildings and Fixtures 968      
Gross Amount, Land 1,092      
Gross Amount, Buildings and Fixtures 1,000      
Total [1] 2,092      
Accumulated Depreciation [2] (245)      
Net $ 1,847      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Training Facility | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 32      
Retail Properties | Post Riverside Office        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 9,680      
Initial Cost Buildings and Fixtures 22,108      
Gross Amount, Land 9,680      
Gross Amount, Buildings and Fixtures 30,543      
Total [1] 40,223      
Accumulated Depreciation [2] (4,560)      
Net $ 35,663      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Riverside Office | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 8,435      
Retail Properties | Colonial Promenade at Huntsville Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Huntsville, AL      
Initial Cost Land $ 1,748      
Gross Amount, Land 1,748      
Total [1] 1,748      
Net $ 1,748      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2017      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2013      
Retail Properties | Post Riverside Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 889      
Initial Cost Buildings and Fixtures 2,340      
Gross Amount, Land 889      
Gross Amount, Buildings and Fixtures 4,908      
Total [1] 5,797      
Accumulated Depreciation [2] (499)      
Net $ 5,298      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Riverside Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 2,568      
Retail Properties | 220 Riverside Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Jacksonville, FL      
Initial Cost Land $ 119      
Initial Cost Buildings and Fixtures 2,902      
Gross Amount, Land 119      
Gross Amount, Buildings and Fixtures 2,909      
Total [1] 3,028      
Accumulated Depreciation [2] (40)      
Net $ 2,988      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2015      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2019      
Retail Properties | 220 Riverside Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 7      
Retail Properties | Allure in Buckhead Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 867      
Initial Cost Buildings and Fixtures 3,465      
Gross Amount, Land 867      
Gross Amount, Buildings and Fixtures 3,895      
Total [1] 4,762      
Accumulated Depreciation [2] (928)      
Net $ 3,834      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2012      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2012      
Retail Properties | Allure in Buckhead Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 430      
Retail Properties | Post Soho Square Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tampa, FL      
Initial Cost Land $ 268      
Initial Cost Buildings and Fixtures 4,033      
Gross Amount, Land 268      
Gross Amount, Buildings and Fixtures 4,039      
Total [1] 4,307      
Accumulated Depreciation [2] (674)      
Net $ 3,633      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2012      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Soho Square Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6      
Retail Properties | Highlands of West Village Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Smyrna, GA      
Initial Cost Land $ 2,500      
Initial Cost Buildings and Fixtures 8,446      
Gross Amount, Land 3,408      
Gross Amount, Buildings and Fixtures 9,802      
Total [1] 13,210      
Accumulated Depreciation [2] (1,742)      
Net $ 11,468      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2012      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2014      
Retail Properties | Highlands of West Village Retail | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 908      
Retail Properties | Highlands of West Village Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,356      
Retail Properties | Post Parkside Atlanta Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Atlanta, GA      
Initial Cost Land $ 426      
Initial Cost Buildings and Fixtures 1,089      
Gross Amount, Land 426      
Gross Amount, Buildings and Fixtures 1,110      
Total [1] 1,536      
Accumulated Depreciation [2] (146)      
Net $ 1,390      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Parkside Atlanta Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 21      
Retail Properties | The Denton Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Kansas City, MO      
Initial Cost Land $ 700      
Initial Cost Buildings and Fixtures 4,439      
Gross Amount, Land 700      
Gross Amount, Buildings and Fixtures 4,949      
Total [1] 5,649      
Accumulated Depreciation [2] (606)      
Net $ 5,043      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2014      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2015      
Retail Properties | The Denton Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 510      
Retail Properties | Post Uptown Place Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 319      
Initial Cost Buildings and Fixtures 1,144      
Gross Amount, Land 319      
Gross Amount, Buildings and Fixtures 1,155      
Total [1] 1,474      
Accumulated Depreciation [2] (159)      
Net $ 1,315      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Uptown Place Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 11      
Retail Properties | 1225 South Church Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 43      
Initial Cost Buildings and Fixtures 199      
Gross Amount, Land 52      
Gross Amount, Buildings and Fixtures 441      
Total [1] 493      
Accumulated Depreciation [2] (140)      
Net $ 353      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2010      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2010      
Retail Properties | 1225 South Church Retail | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 9      
Retail Properties | 1225 South Church Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 242      
Retail Properties | Post Uptown Leasing Center        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 1,290      
Initial Cost Buildings and Fixtures 1,488      
Gross Amount, Land 1,290      
Gross Amount, Buildings and Fixtures 1,602      
Total [1] 2,892      
Accumulated Depreciation [2] (186)      
Net $ 2,706      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Uptown Leasing Center | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 114      
Retail Properties | Bella Casita at Las Colinas Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Irving, TX      
Initial Cost Land $ 46      
Initial Cost Buildings and Fixtures 186      
Gross Amount, Land 46      
Gross Amount, Buildings and Fixtures 350      
Total [1] 396      
Accumulated Depreciation [2] (102)      
Net $ 294      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2007      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2010      
Retail Properties | Bella Casita at Las Colinas Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 164      
Retail Properties | Post Park Maryland Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Washington D.C.      
Initial Cost Land $ 25      
Initial Cost Buildings and Fixtures 137      
Gross Amount, Land 25      
Gross Amount, Buildings and Fixtures 137      
Total [1] 162      
Accumulated Depreciation [2] (14)      
Net $ 148      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2007      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Times Square at Craig Ranch Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location McKinney, TX      
Initial Cost Land $ 253      
Initial Cost Buildings and Fixtures 1,310      
Gross Amount, Land 253      
Gross Amount, Buildings and Fixtures 4,861      
Total [1] 5,114      
Accumulated Depreciation [2] (755)      
Net $ 4,359      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2010      
Retail Properties | Times Square at Craig Ranch Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 3,551      
Retail Properties | Post South End Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 470      
Initial Cost Buildings and Fixtures 1,289      
Gross Amount, Land 470      
Gross Amount, Buildings and Fixtures 1,410      
Total [1] 1,880      
Accumulated Depreciation [2] (205)      
Net $ 1,675      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post South End Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 121      
Retail Properties | Post Rocky Point Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tampa, FL      
Initial Cost Land $ 34      
Initial Cost Buildings and Fixtures 51      
Gross Amount, Land 34      
Gross Amount, Buildings and Fixtures 323      
Total [1] 357      
Accumulated Depreciation [2] (79)      
Net $ 278      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Rocky Point Retail | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1994      
Retail Properties | Post Rocky Point Retail | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
Retail Properties | Post Rocky Point Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 272      
Retail Properties | Post Gateway Place Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Charlotte, NC      
Initial Cost Land $ 318      
Initial Cost Buildings and Fixtures 1,430      
Gross Amount, Land 318      
Gross Amount, Buildings and Fixtures 1,454      
Total [1] 1,772      
Accumulated Depreciation [2] (222)      
Net $ 1,550      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Gateway Place Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 24      
Retail Properties | Post Parkside At Wade Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Raleigh, NC      
Initial Cost Land $ 317      
Initial Cost Buildings and Fixtures 4,552      
Gross Amount, Land 317      
Gross Amount, Buildings and Fixtures 4,623      
Total [1] 4,940      
Accumulated Depreciation [2] (774)      
Net $ 4,166      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2011      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Parkside At Wade Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 71      
Retail Properties | Hue Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Raleigh, NC      
Initial Cost Buildings and Fixtures $ 2,129      
Gross Amount, Buildings and Fixtures 2,194      
Total [1] 2,194      
Accumulated Depreciation [2] (103)      
Net $ 2,091      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2010      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2018      
Retail Properties | Hue Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 65      
Retail Properties | Post Parkside Orlando Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Orlando, FL      
Initial Cost Land $ 742      
Initial Cost Buildings and Fixtures 11,924      
Gross Amount, Land 742      
Gross Amount, Buildings and Fixtures 13,043      
Total [1] 13,785      
Accumulated Depreciation [2] (1,604)      
Net $ 12,181      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Parkside Orlando Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,119      
Retail Properties | Post Harbour Place Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Tampa, FL      
Initial Cost Land $ 386      
Initial Cost Buildings and Fixtures 4,315      
Gross Amount, Land 386      
Gross Amount, Buildings and Fixtures 4,621      
Total [1] 5,007      
Accumulated Depreciation [2] (571)      
Net $ 4,436      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Harbour Place Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 306      
Retail Properties | Post Carlyle Square Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Washington D.C.      
Initial Cost Land $ 1,048      
Initial Cost Buildings and Fixtures 7,930      
Gross Amount, Land 1,048      
Gross Amount, Buildings and Fixtures 7,968      
Total [1] 9,016      
Accumulated Depreciation [2] (1,002)      
Net $ 8,014      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Carlyle Square Retail | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2006      
Retail Properties | Post Carlyle Square Retail | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2016      
Retail Properties | Post Carlyle Square Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 38      
Retail Properties | Post Coles Corner Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 347      
Initial Cost Buildings and Fixtures 716      
Gross Amount, Land 347      
Gross Amount, Buildings and Fixtures 768      
Total [1] 1,115      
Accumulated Depreciation [2] (117)      
Net $ 998      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Coles Corner Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 52      
Retail Properties | Post Square Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 1,581      
Initial Cost Buildings and Fixtures 5,982      
Gross Amount, Land 1,581      
Gross Amount, Buildings and Fixtures 6,259      
Total [1] 7,840      
Accumulated Depreciation [2] (810)      
Net $ 7,030      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1996      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Square Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 277      
Retail Properties | Post Worthington Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 108      
Initial Cost Buildings and Fixtures 495      
Gross Amount, Land 108      
Gross Amount, Buildings and Fixtures 854      
Total [1] 962      
Accumulated Depreciation [2] (64)      
Net $ 898      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Worthington Retail | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1993      
Retail Properties | Post Worthington Retail | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
Retail Properties | Post Worthington Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 359      
Retail Properties | Post Heights Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 1,066      
Initial Cost Buildings and Fixtures 3,314      
Gross Amount, Land 1,066      
Gross Amount, Buildings and Fixtures 3,414      
Total [1] 4,480      
Accumulated Depreciation [2] (475)      
Net $ 4,005      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1997      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Heights Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 100      
Retail Properties | Post Eastside Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 682      
Initial Cost Buildings and Fixtures 10,645      
Gross Amount, Land 682      
Gross Amount, Buildings and Fixtures 10,854      
Total [1] 11,536      
Accumulated Depreciation [2] (1,417)      
Net $ 10,119      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2008      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Eastside Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 209      
Retail Properties | Post Addison Circle Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 448      
Initial Cost Buildings and Fixtures 21,386      
Gross Amount, Land 448      
Gross Amount, Buildings and Fixtures 23,154      
Total [1] 23,602      
Accumulated Depreciation [2] (3,551)      
Net $ 20,051      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Addison Circle Retail | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
Retail Properties | Post Addison Circle Retail | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
Retail Properties | Post Addison Circle Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,768      
Retail Properties | Post Addison Circle Office        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 1,395      
Initial Cost Buildings and Fixtures 4,280      
Gross Amount, Land 1,395      
Gross Amount, Buildings and Fixtures 4,973      
Total [1] 6,368      
Accumulated Depreciation [2] (977)      
Net $ 5,391      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Addison Circle Office | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1998      
Retail Properties | Post Addison Circle Office | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
Retail Properties | Post Addison Circle Office | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 693      
Retail Properties | Post Sierra Frisco Bridges Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 779      
Initial Cost Buildings and Fixtures 6,593      
Gross Amount, Land 779      
Gross Amount, Buildings and Fixtures 7,150      
Total [1] 7,929      
Accumulated Depreciation [2] (998)      
Net $ 6,931      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2009      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Sierra Frisco Bridges Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 557      
Retail Properties | Post Katy Trail Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 465      
Initial Cost Buildings and Fixtures 4,883      
Gross Amount, Land 465      
Gross Amount, Buildings and Fixtures 4,918      
Total [1] 5,383      
Accumulated Depreciation [2] (589)      
Net $ 4,794      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2010      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Katy Trail Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 35      
Retail Properties | Post Midtown Square Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Houston, TX      
Initial Cost Land $ 1,327      
Initial Cost Buildings and Fixtures 16,005      
Gross Amount, Land 1,327      
Gross Amount, Buildings and Fixtures 16,261      
Total [1] 17,588      
Accumulated Depreciation [2] (1,984)      
Net $ 15,604      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Midtown Square Retail | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
Retail Properties | Post Midtown Square Retail | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
Retail Properties | Post Midtown Square Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 256      
Retail Properties | Rise Condo Devel L P Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Houston, TX      
Initial Cost Buildings and Fixtures $ 2,280      
Gross Amount, Buildings and Fixtures 2,280      
Total [1] 2,280      
Accumulated Depreciation [2] (313)      
Net $ 1,967      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Rise Condo Devel L P Retail | Phase I [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 1999      
Retail Properties | Rise Condo Devel L P Retail | Phase II [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2013      
Retail Properties | Post Legacy Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 150      
Initial Cost Buildings and Fixtures 3,334      
Gross Amount, Land 150      
Gross Amount, Buildings and Fixtures 3,680      
Total [1] 3,830      
Accumulated Depreciation [2] (428)      
Net $ 3,402      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2000      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post Legacy Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 346      
Retail Properties | Post South Lamar Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Austin, TX      
Initial Cost Land $ 421      
Initial Cost Buildings and Fixtures 3,072      
Gross Amount, Land 421      
Gross Amount, Buildings and Fixtures 3,508      
Total [1] 3,929      
Accumulated Depreciation [2] (427)      
Net $ 3,502      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2011      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Retail Properties | Post South Lamar Retail | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 436      
Retail Properties | The Greene Retail        
Real Estate And Accumulated Depreciation [Line Items]        
Location Greenville, SC      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date of Construction Dec. 31, 2019      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2019      
Development Properties | Copper Ridge I I        
Real Estate And Accumulated Depreciation [Line Items]        
Location Roanoke, TX      
Initial Cost Land $ 830      
Gross Amount, Land 830      
Gross Amount, Buildings and Fixtures 19,350      
Total [1] 20,180      
Net $ 20,180      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2008      
Development Properties | Copper Ridge I I | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 19,350      
Development Properties | M A A At Frisco Bridges I I        
Real Estate And Accumulated Depreciation [Line Items]        
Location Dallas, TX      
Initial Cost Land $ 6,100      
Gross Amount, Land 6,100      
Gross Amount, Buildings and Fixtures 37,491      
Total [1] 43,591      
Net $ 43,591      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2016      
Development Properties | M A A At Frisco Bridges I I | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 37,491      
Development Properties | Novel Midtown [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Phoenix, AZ      
Initial Cost Land $ 9,381      
Gross Amount, Land 9,381      
Gross Amount, Buildings and Fixtures 20,734      
Total [1] 30,115      
Net $ 30,115      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2019      
Development Properties | Novel Midtown [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 20,734      
Development Properties | Jefferson Sand Lake [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Location Orlando, FL      
Initial Cost Land $ 7,704      
Gross Amount, Land 7,704      
Gross Amount, Buildings and Fixtures 7,695      
Total [1] 15,399      
Net $ 15,399      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2019      
Development Properties | Jefferson Sand Lake [Member] | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 7,695      
Development Properties | Westglenn        
Real Estate And Accumulated Depreciation [Line Items]        
Location Denver, CO      
Initial Cost Land $ 8,077      
Gross Amount, Land 8,077      
Gross Amount, Buildings and Fixtures 9,398      
Total [1] 17,475      
Net $ 17,475      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2018      
Development Properties | Westglenn | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 9,398      
Development Properties | Longpoint        
Real Estate And Accumulated Depreciation [Line Items]        
Location Houston, TX      
Initial Cost Land $ 9,031      
Gross Amount, Land 9,031      
Gross Amount, Buildings and Fixtures 1,437      
Total [1] 10,468      
Net $ 10,468      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2018      
Development Properties | Longpoint | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 1,437      
Development Properties | 336 N Orange        
Real Estate And Accumulated Depreciation [Line Items]        
Location Orlando, FL      
Initial Cost Land $ 6,004      
Gross Amount, Land 6,004      
Gross Amount, Buildings and Fixtures 6,819      
Total [1] 12,823      
Net $ 12,823      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Date Acquired Dec. 31, 2018      
Development Properties | 336 N Orange | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 6,819      
Development Properties | Total Active Development Properties        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost Land 47,127      
Gross Amount, Land 47,127      
Gross Amount, Buildings and Fixtures 102,924      
Total [1] 150,051      
Net 150,051      
Development Properties | Total Active Development Properties | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition 102,924      
Real Estate | Total Properties        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 145,473      
Initial Cost Land 1,899,554      
Initial Cost Buildings and Fixtures 10,112,798      
Gross Amount, Land 1,905,757      
Gross Amount, Buildings and Fixtures 11,931,744      
Total [1] 13,837,501      
Accumulated Depreciation [2] (2,942,838)      
Net 10,894,663      
Real Estate | Total Properties | Land [Member]        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition 6,203      
Real Estate | Total Properties | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition 1,818,946      
Land Improvements | Total Land Held For Future Developments        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost Land 34,548      
Gross Amount, Land 34,548      
Total [1] 34,548      
Net 34,548      
Corporate Real Estate Owned Domain | Corporate Properties        
Real Estate And Accumulated Depreciation [Line Items]        
Gross Amount, Buildings and Fixtures 26,658      
Total [1] 26,658      
Accumulated Depreciation [2] (12,415)      
Net 14,243      
Corporate Real Estate Owned Domain | Corporate Properties | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition 26,658      
Other Real Estate Owned | Total Other        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost Land 34,548      
Gross Amount, Land 34,548      
Gross Amount, Buildings and Fixtures 26,658      
Total [1] 61,206      
Accumulated Depreciation [2] (12,415)      
Net 48,791      
Other Real Estate Owned | Total Other | Buildings and Fixtures        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition $ 26,658      
[1]

(4)

The aggregate cost for federal income tax purposes was approximately $11.4 billion at December 31, 2019. The aggregate cost for book purposes exceeds the total gross amount of real estate assets for federal income tax purposes, principally due to purchase accounting adjustments recorded under accounting principles generally accepted in the United States of America.
[2]

(5)

Depreciation is recognized on a straight-line basis over the estimated useful asset life, which ranges from eight to 40 years for land improvements and buildings, five years for furniture, fixtures and equipment and six months for the fair market value of residential leases.