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Schedule III - Real Estate and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Real Estate And Accumulated Depreciation [Line Items]      
Balance, beginning of period $ 1,319,350 $ 1,372,015 $ 689,112
Additions during period:      
Acquisitions 241,071   707,268
Improvements to land and building 14,368 10,664 8,941
Deductions during period:      
Dispositions of real estate (70,633) (63,329) (33,306)
Reclassification to held for sale   (69,994)  
Balance, end of period   1,319,350 1,372,015
Balance, beginning of period 60,719 39,638 23,376
Depreciation expense 32,586 31,085 20,888
Dispositions of real estate (9,208) (10,004) (4,626)
Reclassification to held for sale   (9,208)  
Balance, end of period   60,719 39,638
Investment in Real Estate      
Real Estate And Accumulated Depreciation [Line Items]      
Initial Cost, Land 193,026    
Initial Cost, Building 1,279,777    
Cost of Improvements, net of Retirements 31,353    
Gross Carrying Amount, Land 193,026    
Accumulated Depreciation- Building (84,097)    
Encumbrances (Unpaid Principal) (580,635)    
Balance, beginning of period 1,249,356 1,372,015  
Deductions during period:      
Balance, end of period 1,504,156 1,249,356 1,372,015
Balance, beginning of period 51,511 39,638  
Balance, end of period 84,097 51,511 $ 39,638
Investment in Real Estate | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 1,311,130    
Investment in Real Estate | Crestmont Apartments      
Real Estate And Accumulated Depreciation [Line Items]      
Location Marietta, GA    
Initial Cost, Land $ 3,254    
Initial Cost, Building 13,017    
Cost of Improvements, net of Retirements 1,285    
Gross Carrying Amount, Land 3,254    
Accumulated Depreciation- Building (3,800)    
Encumbrances (Unpaid Principal) $ (6,326)    
Year of Acquisition 2011    
Life of Depreciation 40 years    
Investment in Real Estate | Crestmont Apartments | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 14,302    
Investment in Real Estate | Runaway Bay Apartments      
Real Estate And Accumulated Depreciation [Line Items]      
Location Indianapolis, IN    
Initial Cost, Land $ 3,079    
Initial Cost, Building 12,318    
Cost of Improvements, net of Retirements 869    
Gross Carrying Amount, Land 3,079    
Accumulated Depreciation- Building (1,998)    
Encumbrances (Unpaid Principal) $ (9,423)    
Year of Acquisition 2012    
Life of Depreciation 40 years    
Investment in Real Estate | Runaway Bay Apartments | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 13,187    
Investment in Real Estate | Reserve at Eagle Ridge      
Real Estate And Accumulated Depreciation [Line Items]      
Location Waukegan, IL    
Initial Cost, Land $ 5,800    
Initial Cost, Building 22,743    
Cost of Improvements, net of Retirements 908    
Gross Carrying Amount, Land 5,800    
Accumulated Depreciation- Building (2,484)    
Encumbrances (Unpaid Principal) $ (18,850)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Reserve at Eagle Ridge | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 23,651    
Investment in Real Estate | Windrush      
Real Estate And Accumulated Depreciation [Line Items]      
Location Edmond, OK    
Initial Cost, Land $ 1,677    
Initial Cost, Building 7,464    
Cost of Improvements, net of Retirements 452    
Gross Carrying Amount, Land 1,677    
Accumulated Depreciation- Building $ (843)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Windrush | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 7,916    
Investment in Real Estate | Heritage Park      
Real Estate And Accumulated Depreciation [Line Items]      
Location Oklahoma, OK    
Initial Cost, Land $ 4,234    
Initial Cost, Building 12,232    
Cost of Improvements, net of Retirements 1,328    
Gross Carrying Amount, Land 4,234    
Accumulated Depreciation- Building $ (1,584)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Heritage Park | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 13,560    
Investment in Real Estate | Raindance      
Real Estate And Accumulated Depreciation [Line Items]      
Location Oklahoma, OK    
Initial Cost, Land $ 3,503    
Initial Cost, Building 10,051    
Cost of Improvements, net of Retirements 1,187    
Gross Carrying Amount, Land 3,503    
Accumulated Depreciation- Building $ (1,311)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Raindance | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 11,238    
Investment in Real Estate | Augusta      
Real Estate And Accumulated Depreciation [Line Items]      
Location Oklahoma, OK    
Initial Cost, Land $ 1,296    
Initial Cost, Building 9,930    
Cost of Improvements, net of Retirements 619    
Gross Carrying Amount, Land 1,296    
Accumulated Depreciation- Building $ (1,143)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Augusta | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 10,549    
Investment in Real Estate | Invitational      
Real Estate And Accumulated Depreciation [Line Items]      
Location Oklahoma, OK    
Initial Cost, Land $ 1,924    
Initial Cost, Building 16,852    
Cost of Improvements, net of Retirements 868    
Gross Carrying Amount, Land 1,924    
Accumulated Depreciation- Building $ (1,901)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Invitational | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 17,720    
Investment in Real Estate | Kings Landing      
Real Estate And Accumulated Depreciation [Line Items]      
Location Creve Coeur, MO    
Initial Cost, Land $ 2,513    
Initial Cost, Building 29,873    
Cost of Improvements, net of Retirements 601    
Gross Carrying Amount, Land 2,513    
Accumulated Depreciation- Building (2,914)    
Encumbrances (Unpaid Principal) $ (20,992)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Kings Landing | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 30,474    
Investment in Real Estate | Carrington      
Real Estate And Accumulated Depreciation [Line Items]      
Location Little Rock, AR    
Initial Cost, Land $ 1,715    
Initial Cost, Building 19,526    
Cost of Improvements, net of Retirements 1,208    
Gross Carrying Amount, Land 1,715    
Accumulated Depreciation- Building (2,090)    
Encumbrances (Unpaid Principal) $ (14,235)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Carrington | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 20,734    
Investment in Real Estate | ArborsAtTheReservoirMember      
Real Estate And Accumulated Depreciation [Line Items]      
Location Ridgeland, MS    
Initial Cost, Land $ 4,050    
Initial Cost, Building 15,946    
Cost of Improvements, net of Retirements 1,134    
Gross Carrying Amount, Land 4,050    
Accumulated Depreciation- Building (1,780)    
Encumbrances (Unpaid Principal) $ (13,150)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | ArborsAtTheReservoirMember | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 17,080    
Investment in Real Estate | Walnut Hill      
Real Estate And Accumulated Depreciation [Line Items]      
Location Cordova, TN    
Initial Cost, Land $ 2,230    
Initial Cost, Building 25,251    
Cost of Improvements, net of Retirements 912    
Gross Carrying Amount, Land 2,230    
Accumulated Depreciation- Building (2,400)    
Encumbrances (Unpaid Principal) $ (18,650)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Walnut Hill | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 26,163    
Investment in Real Estate | Lenoxplace      
Real Estate And Accumulated Depreciation [Line Items]      
Location Raleigh, NC    
Initial Cost, Land $ 3,480    
Initial Cost, Building 20,482    
Cost of Improvements, net of Retirements 682    
Gross Carrying Amount, Land 3,480    
Accumulated Depreciation- Building (1,880)    
Encumbrances (Unpaid Principal) $ (15,991)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Lenoxplace | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 21,164    
Investment in Real Estate | Stonebridge Crossing      
Real Estate And Accumulated Depreciation [Line Items]      
Location Memphis, TN    
Initial Cost, Land $ 3,100    
Initial Cost, Building 26,223    
Cost of Improvements, net of Retirements 1,356    
Gross Carrying Amount, Land 3,100    
Accumulated Depreciation- Building (2,479)    
Encumbrances (Unpaid Principal) $ (19,370)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Stonebridge Crossing | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 27,579    
Investment in Real Estate | Bennington Pond      
Real Estate And Accumulated Depreciation [Line Items]      
Location Groveport, OH    
Initial Cost, Land $ 2,400    
Initial Cost, Building 14,828    
Cost of Improvements, net of Retirements 819    
Gross Carrying Amount, Land 2,400    
Accumulated Depreciation- Building (1,375)    
Encumbrances (Unpaid Principal) $ (11,375)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Bennington Pond | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 15,647    
Investment in Real Estate | Prospect Park      
Real Estate And Accumulated Depreciation [Line Items]      
Location Louisville, KY    
Initial Cost, Land $ 2,837    
Initial Cost, Building 11,193    
Cost of Improvements, net of Retirements 286    
Gross Carrying Amount, Land 2,837    
Accumulated Depreciation- Building (911)    
Encumbrances (Unpaid Principal) $ (9,230)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Prospect Park | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 11,479    
Investment in Real Estate | Brookside      
Real Estate And Accumulated Depreciation [Line Items]      
Location Louisville, KY    
Initial Cost, Land $ 3,947    
Initial Cost, Building 16,502    
Cost of Improvements, net of Retirements 592    
Gross Carrying Amount, Land 3,947    
Accumulated Depreciation- Building (1,380)    
Encumbrances (Unpaid Principal) $ (13,455)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Brookside | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 17,094    
Investment in Real Estate | Jamestown      
Real Estate And Accumulated Depreciation [Line Items]      
Location Louisville, KY    
Initial Cost, Land $ 7,034    
Initial Cost, Building 27,730    
Cost of Improvements, net of Retirements 2,373    
Gross Carrying Amount, Land 7,034    
Accumulated Depreciation- Building (2,463)    
Encumbrances (Unpaid Principal) $ (22,880)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Jamestown | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 30,103    
Investment in Real Estate | Oxmoor      
Real Estate And Accumulated Depreciation [Line Items]      
Location Louisville, KY    
Initial Cost, Land $ 7,411    
Initial Cost, Building 47,095    
Cost of Improvements, net of Retirements 1,230    
Gross Carrying Amount, Land 7,411    
Accumulated Depreciation- Building (3,854)    
Encumbrances (Unpaid Principal) $ (35,815)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Oxmoor | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 48,325    
Investment in Real Estate | Meadows      
Real Estate And Accumulated Depreciation [Line Items]      
Location Louisville, KY    
Initial Cost, Land $ 6,857    
Initial Cost, Building 30,030    
Cost of Improvements, net of Retirements 1,337    
Gross Carrying Amount, Land 6,857    
Accumulated Depreciation- Building (2,528)    
Encumbrances (Unpaid Principal) $ (24,245)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Meadows | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 31,367    
Investment in Real Estate | Stonebridge At The Ranch      
Real Estate And Accumulated Depreciation [Line Items]      
Location Little Rock, AR    
Initial Cost, Land $ 3,315    
Initial Cost, Building 27,954    
Cost of Improvements, net of Retirements 721    
Gross Carrying Amount, Land 3,315    
Accumulated Depreciation- Building (2,213)    
Encumbrances (Unpaid Principal) $ (20,527)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Stonebridge At The Ranch | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 28,675    
Investment in Real Estate | Iron Rock Ranch      
Real Estate And Accumulated Depreciation [Line Items]      
Location Austin, TX    
Initial Cost, Land $ 5,860    
Initial Cost, Building 28,911    
Cost of Improvements, net of Retirements 819    
Gross Carrying Amount, Land 5,860    
Accumulated Depreciation- Building (2,384)    
Encumbrances (Unpaid Principal) $ (22,900)    
Year of Acquisition 2014    
Life of Depreciation 40 years    
Investment in Real Estate | Iron Rock Ranch | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 29,730    
Investment in Real Estate | Bayview Club      
Real Estate And Accumulated Depreciation [Line Items]      
Location Indianapolis, IN    
Initial Cost, Land $ 2,525    
Initial Cost, Building 22,506    
Cost of Improvements, net of Retirements 989    
Gross Carrying Amount, Land 2,525    
Accumulated Depreciation- Building $ (1,638)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Bayview Club | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 23,495    
Investment in Real Estate | Arbors River Oaks      
Real Estate And Accumulated Depreciation [Line Items]      
Location Memphis, TN    
Initial Cost, Land $ 2,100    
Initial Cost, Building 19,045    
Cost of Improvements, net of Retirements 789    
Gross Carrying Amount, Land 2,100    
Accumulated Depreciation- Building $ (1,228)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Arbors River Oaks | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 19,834    
Investment in Real Estate | Aston      
Real Estate And Accumulated Depreciation [Line Items]      
Location Wake Forest, NC    
Initial Cost, Land $ 3,450    
Initial Cost, Building 34,333    
Cost of Improvements, net of Retirements 222    
Gross Carrying Amount, Land 3,450    
Accumulated Depreciation- Building (1,970)    
Encumbrances (Unpaid Principal) $ (25,050)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Aston | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 34,555    
Investment in Real Estate | Avenues At Craig Ranch      
Real Estate And Accumulated Depreciation [Line Items]      
Location McKinney, TX    
Initial Cost, Land $ 5,500    
Initial Cost, Building 42,054    
Cost of Improvements, net of Retirements 259    
Gross Carrying Amount, Land 5,500    
Accumulated Depreciation- Building (2,413)    
Encumbrances (Unpaid Principal) $ (31,250)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Avenues At Craig Ranch | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 42,313    
Investment in Real Estate | Bridge Pointe      
Real Estate And Accumulated Depreciation [Line Items]      
Location Huntsville, AL    
Initial Cost, Land $ 1,500    
Initial Cost, Building 14,306    
Cost of Improvements, net of Retirements 319    
Gross Carrying Amount, Land 1,500    
Accumulated Depreciation- Building $ (860)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Bridge Pointe | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 14,625    
Investment in Real Estate | Creekstone At R T P      
Real Estate And Accumulated Depreciation [Line Items]      
Location Durham, NC    
Initial Cost, Land $ 5,376    
Initial Cost, Building 32,727    
Cost of Improvements, net of Retirements 247    
Gross Carrying Amount, Land 5,376    
Accumulated Depreciation- Building (1,887)    
Encumbrances (Unpaid Principal) $ (22,581)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Creekstone At R T P | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 32,974    
Investment in Real Estate | Fountains Southend      
Real Estate And Accumulated Depreciation [Line Items]      
Location Charlotte, NC    
Initial Cost, Land $ 4,368    
Initial Cost, Building 37,254    
Cost of Improvements, net of Retirements 142    
Gross Carrying Amount, Land 4,368    
Accumulated Depreciation- Building (2,118)    
Encumbrances (Unpaid Principal) $ (23,388)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Fountains Southend | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 37,396    
Investment in Real Estate | Fox Trails      
Real Estate And Accumulated Depreciation [Line Items]      
Location Plano, TX    
Initial Cost, Land $ 5,700    
Initial Cost, Building 21,944    
Cost of Improvements, net of Retirements 669    
Gross Carrying Amount, Land 5,700    
Accumulated Depreciation- Building $ (1,356)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Fox Trails | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 22,613    
Investment in Real Estate | Lakeshore on the Hill      
Real Estate And Accumulated Depreciation [Line Items]      
Location Chattanooga, TN    
Initial Cost, Land $ 925    
Initial Cost, Building 10,212    
Cost of Improvements, net of Retirements 372    
Gross Carrying Amount, Land 925    
Accumulated Depreciation- Building $ (634)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Lakeshore on the Hill | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 10,584    
Investment in Real Estate | Millenia 700      
Real Estate And Accumulated Depreciation [Line Items]      
Location Orlando, FL    
Initial Cost, Land $ 5,500    
Initial Cost, Building 41,752    
Cost of Improvements, net of Retirements 401    
Gross Carrying Amount, Land 5,500    
Accumulated Depreciation- Building (2,403)    
Encumbrances (Unpaid Principal) $ (29,175)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Millenia 700 | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 42,153    
Investment in Real Estate | Miller Creek At German Town      
Real Estate And Accumulated Depreciation [Line Items]      
Location Memphis, TN    
Initial Cost, Land $ 3,300    
Initial Cost, Building 53,504    
Cost of Improvements, net of Retirements 244    
Gross Carrying Amount, Land 3,300    
Accumulated Depreciation- Building $ (3,048)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Miller Creek At German Town | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 53,748    
Investment in Real Estate | Pointe At Canyon Ridge      
Real Estate And Accumulated Depreciation [Line Items]      
Location Atlanta, GA    
Initial Cost, Land $ 11,100    
Initial Cost, Building 36,995    
Cost of Improvements, net of Retirements 1,855    
Gross Carrying Amount, Land 11,100    
Accumulated Depreciation- Building $ (2,341)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Pointe At Canyon Ridge | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 38,850    
Investment in Real Estate | St James At Goose Creek      
Real Estate And Accumulated Depreciation [Line Items]      
Location Goose Creek, SC    
Initial Cost, Land $ 3,780    
Initial Cost, Building 27,695    
Cost of Improvements, net of Retirements 390    
Gross Carrying Amount, Land 3,780    
Accumulated Depreciation- Building $ (1,661)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | St James At Goose Creek | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 28,085    
Investment in Real Estate | Talison Row At Daniel Island      
Real Estate And Accumulated Depreciation [Line Items]      
Location Daniel Island, SC    
Initial Cost, Land $ 5,480    
Initial Cost, Building 41,409    
Cost of Improvements, net of Retirements 336    
Gross Carrying Amount, Land 5,480    
Accumulated Depreciation- Building (2,392)    
Encumbrances (Unpaid Principal) $ (32,848)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Talison Row At Daniel Island | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 41,745    
Investment in Real Estate | Aventine Greenville      
Real Estate And Accumulated Depreciation [Line Items]      
Location Greenville, SC    
Initial Cost, Land $ 4,150    
Initial Cost, Building 43,905    
Cost of Improvements, net of Retirements 178    
Gross Carrying Amount, Land 4,150    
Accumulated Depreciation- Building (2,488)    
Encumbrances (Unpaid Principal) $ (29,825)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Aventine Greenville | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 44,083    
Investment in Real Estate | Trails At Signal Mountain      
Real Estate And Accumulated Depreciation [Line Items]      
Location Chattanooga, TN    
Initial Cost, Land $ 1,200    
Initial Cost, Building 12,895    
Cost of Improvements, net of Retirements 403    
Gross Carrying Amount, Land 1,200    
Accumulated Depreciation- Building $ (806)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Trails At Signal Mountain | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 13,298    
Investment in Real Estate | Vue At Knoll Trail      
Real Estate And Accumulated Depreciation [Line Items]      
Location Dallas, TX    
Initial Cost, Land $ 3,100    
Initial Cost, Building 6,077    
Cost of Improvements, net of Retirements 178    
Gross Carrying Amount, Land 3,100    
Accumulated Depreciation- Building $ (377)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Vue At Knoll Trail | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 6,255    
Investment in Real Estate | Waterstone at Brier Creek      
Real Estate And Accumulated Depreciation [Line Items]      
Location Raleigh, NC    
Initial Cost, Land $ 4,200    
Initial Cost, Building 34,651    
Cost of Improvements, net of Retirements 184    
Gross Carrying Amount, Land 4,200    
Accumulated Depreciation- Building (1,985)    
Encumbrances (Unpaid Principal) $ (20,425)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Waterstone at Brier Creek | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 34,835    
Investment in Real Estate | Waterstone Big Creek      
Real Estate And Accumulated Depreciation [Line Items]      
Location Alpharetta, GA    
Initial Cost, Land $ 7,600    
Initial Cost, Building 61,971    
Cost of Improvements, net of Retirements 187    
Gross Carrying Amount, Land 7,600    
Accumulated Depreciation- Building (3,518)    
Encumbrances (Unpaid Principal) $ (49,680)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Waterstone Big Creek | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 62,158    
Investment in Real Estate | Westmont Commons      
Real Estate And Accumulated Depreciation [Line Items]      
Location Asheville, NC    
Initial Cost, Land $ 2,750    
Initial Cost, Building 25,225    
Cost of Improvements, net of Retirements 344    
Gross Carrying Amount, Land 2,750    
Accumulated Depreciation- Building $ (1,493)    
Year of Acquisition 2015    
Life of Depreciation 40 years    
Investment in Real Estate | Westmont Commons | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 25,569    
Investment in Real Estate | Lakes at Northdale      
Real Estate And Accumulated Depreciation [Line Items]      
Location Tampa, FL    
Initial Cost, Land $ 3,898    
Initial Cost, Building 25,543    
Cost of Improvements, net of Retirements 426    
Gross Carrying Amount, Land 3,898    
Accumulated Depreciation- Building $ (546)    
Year of Acquisition 2017    
Life of Depreciation 40 years    
Investment in Real Estate | Lakes at Northdale | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 25,969    
Investment in Real Estate | Haverford Place      
Real Estate And Accumulated Depreciation [Line Items]      
Location Lexington, KY    
Initial Cost, Land $ 3,927    
Initial Cost, Building 10,100    
Cost of Improvements, net of Retirements 355    
Gross Carrying Amount, Land 3,927    
Accumulated Depreciation- Building $ (158)    
Year of Acquisition 2017    
Life of Depreciation 40 years    
Investment in Real Estate | Haverford Place | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 10,455    
Investment in Real Estate | South Terrace      
Real Estate And Accumulated Depreciation [Line Items]      
Location Durham, NC    
Initial Cost, Land $ 5,621    
Initial Cost, Building 36,923    
Cost of Improvements, net of Retirements 166    
Gross Carrying Amount, Land 5,621    
Accumulated Depreciation- Building $ (467)    
Year of Acquisition 2017    
Life of Depreciation 40 years    
Investment in Real Estate | South Terrace | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 37,089    
Investment in Real Estate | Cherry Grove      
Real Estate And Accumulated Depreciation [Line Items]      
Location North Myrtle Beach, SC    
Initial Cost, Land $ 550    
Initial Cost, Building 15,369    
Cost of Improvements, net of Retirements 24    
Gross Carrying Amount, Land 550    
Accumulated Depreciation- Building $ (96)    
Year of Acquisition 2017    
Life of Depreciation 40 years    
Investment in Real Estate | Cherry Grove | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 15,393    
Investment in Real Estate | Kensington Commons      
Real Estate And Accumulated Depreciation [Line Items]      
Location Canal Winchester, OH    
Initial Cost, Land $ 3,400    
Initial Cost, Building 20,703    
Cost of Improvements, net of Retirements 21    
Gross Carrying Amount, Land 3,400    
Accumulated Depreciation- Building $ (130)    
Year of Acquisition 2017    
Life of Depreciation 40 years    
Investment in Real Estate | Kensington Commons | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 20,724    
Investment in Real Estate | Schirm Farms      
Real Estate And Accumulated Depreciation [Line Items]      
Location Canal Winchester, OH    
Initial Cost, Land $ 3,960    
Initial Cost, Building 19,488    
Cost of Improvements, net of Retirements 38    
Gross Carrying Amount, Land 3,960    
Accumulated Depreciation- Building $ (122)    
Year of Acquisition 2017    
Life of Depreciation 40 years    
Investment in Real Estate | Schirm Farms | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 19,526    
Investment in Real Estate | Riverchase      
Real Estate And Accumulated Depreciation [Line Items]      
Location Indianapolis, IN    
Initial Cost, Land $ 1,460    
Initial Cost, Building 17,250    
Cost of Improvements, net of Retirements 17    
Gross Carrying Amount, Land 1,460    
Accumulated Depreciation- Building $ (108)    
Year of Acquisition 2017    
Life of Depreciation 40 years    
Investment in Real Estate | Riverchase | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 17,267    
Investment in Real Estate | Live Oak Trace      
Real Estate And Accumulated Depreciation [Line Items]      
Location Baton Rouge, LA    
Initial Cost, Land $ 1,060    
Initial Cost, Building 27,362    
Cost of Improvements, net of Retirements 9    
Gross Carrying Amount, Land 1,060    
Accumulated Depreciation- Building $ (114)    
Year of Acquisition 2017    
Life of Depreciation 40 years    
Investment in Real Estate | Live Oak Trace | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 27,371    
Investment in Real Estate | Tides at Calabash      
Real Estate And Accumulated Depreciation [Line Items]      
Location Wilmington, NC    
Initial Cost, Land $ 1,880    
Initial Cost, Building 12,214    
Cost of Improvements, net of Retirements 3    
Gross Carrying Amount, Land 1,880    
Accumulated Depreciation- Building $ (25)    
Year of Acquisition 2017    
Life of Depreciation 40 years    
Investment in Real Estate | Tides at Calabash | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 12,217    
Investment in Real Estate | Brunswick Point      
Real Estate And Accumulated Depreciation [Line Items]      
Location Wilmington, NC    
Initial Cost, Land $ 2,150    
Initial Cost, Building 28,214    
Gross Carrying Amount, Land 2,150    
Encumbrances (Unpaid Principal) $ (19,000)    
Year of Acquisition 2017    
Life of Depreciation 40 years    
Investment in Real Estate | Brunswick Point | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 28,214    
Real Estate Held for Sale      
Real Estate And Accumulated Depreciation [Line Items]      
Balance, beginning of period 69,994    
Deductions during period:      
Balance, end of period   69,994  
Balance, beginning of period $ 9,208    
Balance, end of period   $ 9,208