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Schedule III - Real Estate and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
 [1]
Dec. 31, 2017
Real Estate And Accumulated Depreciation [Line Items]      
Balance, beginning of period $ 1,745,640 [1] $ 1,504,156 $ 1,319,350
Additions during period:      
Acquisitions 127,908 270,220 241,071
Improvements to land and building 45,623 41,587 14,368
Deductions during period:      
Dispositions of real estate (121,865) (69,915) (70,633)
Asset write-offs (941) (408)  
Balance, end of period 1,796,365 1,745,640 1,504,156 [1]
Balance, beginning of period 120,202 [1] 84,097 60,719
Depreciation expense 50,955 41,652 32,586
Dispositions of real estate (11,781) (5,139) (9,208)
Asset write-off (941) (408)  
Balance, end of period 158,435 $ 120,202 $ 84,097 [1]
Investment in Real Estate      
Real Estate And Accumulated Depreciation [Line Items]      
Initial Cost, Land 234,050    
Initial Cost, Building 1,453,052    
Cost of Improvements, net of Retirements 109,263    
Gross Carrying Amount, Land 234,050    
Accumulated Depreciation- Building (158,435)    
Encumbrances (Unpaid Principal) (504,876)    
Investment in Real Estate | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 1,562,315    
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 5,723    
Gross Carrying Amount, Land 3,254    
Accumulated Depreciation- Building (5,590)    
Encumbrances (Unpaid Principal) $ (6,113)    
Year of Acquisition 2011    
Investment in Real Estate | Crestmont Apartments | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 18,740    
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 1,279    
Gross Carrying Amount, Land 3,079    
Accumulated Depreciation- Building (2,717)    
Encumbrances (Unpaid Principal) $ (8,978)    
Year of Acquisition 2012    
Investment in Real Estate | Runaway Bay Apartments | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 13,597    
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 841    
Gross Carrying Amount, Land 1,677    
Accumulated Depreciation- Building $ (1,417)    
Year of Acquisition 2014    
Investment in Real Estate | Windrush | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 8,305    
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 2,772    
Gross Carrying Amount, Land 4,234    
Accumulated Depreciation- Building $ (2,816)    
Year of Acquisition 2014    
Investment in Real Estate | Heritage Park | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 15,004    
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 2,127    
Gross Carrying Amount, Land 3,503    
Accumulated Depreciation- Building $ (2,267)    
Year of Acquisition 2014    
Investment in Real Estate | Raindance | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 12,178    
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 1,127    
Gross Carrying Amount, Land 1,296    
Accumulated Depreciation- Building $ (1,878)    
Year of Acquisition 2014    
Investment in Real Estate | Augusta | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 11,057    
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 2,012    
Gross Carrying Amount, Land 1,924    
Accumulated Depreciation- Building $ (3,048)    
Year of Acquisition 2014    
Investment in Real Estate | Invitational | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 18,864    
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 1,193    
Gross Carrying Amount, Land 2,513    
Accumulated Depreciation- Building (4,728)    
Encumbrances (Unpaid Principal) $ (20,263)    
Year of Acquisition 2014    
Investment in Real Estate | Kings Landing | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 31,066    
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 1,632    
Gross Carrying Amount, Land 2,230    
Accumulated Depreciation- Building (4,101)    
Encumbrances (Unpaid Principal) $ (18,650)    
Year of Acquisition 2014    
Investment in Real Estate | Walnut Hill | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 26,883    
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 1,156    
Gross Carrying Amount, Land 3,480    
Accumulated Depreciation- Building (3,158)    
Encumbrances (Unpaid Principal) $ (15,991)    
Year of Acquisition 2014    
Investment in Real Estate | Lenoxplace | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 21,638    
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 6,429    
Gross Carrying Amount, Land 3,100    
Accumulated Depreciation- Building (4,941)    
Encumbrances (Unpaid Principal) $ (19,370)    
Year of Acquisition 2014    
Investment in Real Estate | Stonebridge Crossing | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 32,652    
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 1,290    
Gross Carrying Amount, Land 2,400    
Accumulated Depreciation- Building (2,506)    
Encumbrances (Unpaid Principal) $ (11,375)    
Year of Acquisition 2014    
Investment in Real Estate | Bennington Pond | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 16,118    
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 828    
Gross Carrying Amount, Land 2,837    
Accumulated Depreciation- Building (1,662)    
Encumbrances (Unpaid Principal) $ (9,230)    
Year of Acquisition 2014    
Investment in Real Estate | Prospect Park | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 12,021    
Investment in Real Estate | Brookside      
Real Estate And Accumulated Depreciation [Line Items]      
Location Louisville, KY    
Initial Cost, Land $ 3,947    
Initial Cost, Building 16,503    
Cost of Improvements, net of Retirements 1,134    
Gross Carrying Amount, Land 3,947    
Accumulated Depreciation- Building (2,490)    
Encumbrances (Unpaid Principal) $ (13,455)    
Year of Acquisition 2014    
Investment in Real Estate | Brookside | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 17,637    
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 10,029    
Gross Carrying Amount, Land 7,034    
Accumulated Depreciation- Building (6,205)    
Encumbrances (Unpaid Principal) $ (22,880)    
Year of Acquisition 2014    
Investment in Real Estate | Jamestown | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 37,759    
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 7,820    
Gross Carrying Amount, Land 7,411    
Accumulated Depreciation- Building (7,634)    
Encumbrances (Unpaid Principal) $ (35,815)    
Year of Acquisition 2014    
Investment in Real Estate | Oxmoor | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 54,915    
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 2,410    
Gross Carrying Amount, Land 6,857    
Accumulated Depreciation- Building (4,590)    
Encumbrances (Unpaid Principal) $ (24,245)    
Year of Acquisition 2014    
Investment in Real Estate | Meadows | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 32,440    
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 1,743    
Gross Carrying Amount, Land 2,525    
Accumulated Depreciation- Building $ (3,222)    
Year of Acquisition 2015    
Investment in Real Estate | Bayview Club | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 24,249    
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 2,794    
Gross Carrying Amount, Land 2,100    
Accumulated Depreciation- Building $ (2,764)    
Year of Acquisition 2015    
Investment in Real Estate | Arbors River Oaks | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 21,839    
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 702    
Gross Carrying Amount, Land 3,450    
Accumulated Depreciation- Building (3,851)    
Encumbrances (Unpaid Principal) $ (25,050)    
Year of Acquisition 2015    
Investment in Real Estate | Aston | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 35,035    
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 806    
Gross Carrying Amount, Land 5,500    
Accumulated Depreciation- Building (4,712)    
Encumbrances (Unpaid Principal) $ (30,941)    
Year of Acquisition 2015    
Investment in Real Estate | Avenues At Craig Ranch | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 42,860    
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 665    
Gross Carrying Amount, Land 1,500    
Accumulated Depreciation- Building $ (1,753)    
Year of Acquisition 2015    
Investment in Real Estate | Bridge Pointe | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 14,971    
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 627    
Gross Carrying Amount, Land 5,376    
Accumulated Depreciation- Building (3,680)    
Encumbrances (Unpaid Principal) $ (21,713)    
Year of Acquisition 2015    
Investment in Real Estate | Creekstone At R T P | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 33,354    
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 554    
Gross Carrying Amount, Land 4,368    
Accumulated Depreciation- Building (4,097)    
Encumbrances (Unpaid Principal) $ (22,582)    
Year of Acquisition 2015    
Investment in Real Estate | Fountains Southend | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 37,808    
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 2,398    
Gross Carrying Amount, Land 5,700    
Accumulated Depreciation- Building $ (2,946)    
Year of Acquisition 2015    
Investment in Real Estate | Fox Trails | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 24,342    
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 949    
Gross Carrying Amount, Land 925    
Accumulated Depreciation- Building $ (1,342)    
Year of Acquisition 2015    
Investment in Real Estate | Lakeshore on the Hill | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 11,161    
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 1,478    
Gross Carrying Amount, Land 5,500    
Accumulated Depreciation- Building (4,803)    
Encumbrances (Unpaid Principal) $ (28,252)    
Year of Acquisition 2015    
Investment in Real Estate | Millenia 700 | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 43,230    
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 537    
Gross Carrying Amount, Land 3,300    
Accumulated Depreciation- Building $ (5,863)    
Year of Acquisition 2015    
Investment in Real Estate | Miller Creek At German Town | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 54,041    
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 7,091    
Gross Carrying Amount, Land 11,100    
Accumulated Depreciation- Building $ (5,945)    
Year of Acquisition 2015    
Investment in Real Estate | Pointe At Canyon Ridge | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 44,086    
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 874    
Gross Carrying Amount, Land 3,780    
Accumulated Depreciation- Building $ (3,288)    
Year of Acquisition 2015    
Investment in Real Estate | St James At Goose Creek | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 28,569    
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 686    
Gross Carrying Amount, Land 5,480    
Accumulated Depreciation- Building (4,642)    
Encumbrances (Unpaid Principal) $ (31,640)    
Year of Acquisition 2015    
Investment in Real Estate | Talison Row At Daniel Island | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 42,095    
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 1,126    
Gross Carrying Amount, Land 1,200    
Accumulated Depreciation- Building $ (1,678)    
Year of Acquisition 2015    
Investment in Real Estate | Trails At Signal Mountain | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 14,021    
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 357    
Gross Carrying Amount, Land 3,100    
Accumulated Depreciation- Building $ (780)    
Year of Acquisition 2015    
Investment in Real Estate | Vue At Knoll Trail | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 6,434    
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 546    
Gross Carrying Amount, Land 4,200    
Accumulated Depreciation- Building (3,843)    
Encumbrances (Unpaid Principal) $ (16,040)    
Year of Acquisition 2015    
Investment in Real Estate | Waterstone at Brier Creek | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 35,197    
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 519    
Gross Carrying Amount, Land 7,600    
Accumulated Depreciation- Building (6,739)    
Encumbrances (Unpaid Principal) $ (49,224)    
Year of Acquisition 2015    
Investment in Real Estate | Waterstone Big Creek | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 62,490    
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 682    
Gross Carrying Amount, Land 2,750    
Accumulated Depreciation- Building $ (2,957)    
Year of Acquisition 2015    
Investment in Real Estate | Westmont Commons | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 25,907    
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 1,006    
Gross Carrying Amount, Land 3,898    
Accumulated Depreciation- Building $ (2,056)    
Year of Acquisition 2017    
Investment in Real Estate | Lakes at Northdale | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 26,549    
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 1,412    
Gross Carrying Amount, Land 3,927    
Accumulated Depreciation- Building $ (1,022)    
Year of Acquisition 2017    
Investment in Real Estate | Haverford Place | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 11,512    
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 6,715    
Gross Carrying Amount, Land 5,621    
Accumulated Depreciation- Building $ (3,788)    
Year of Acquisition 2017    
Investment in Real Estate | South Terrace | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 43,638    
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 996    
Gross Carrying Amount, Land 550    
Accumulated Depreciation- Building $ (1,099)    
Year of Acquisition 2017    
Investment in Real Estate | Cherry Grove | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 16,365    
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 2,337    
Gross Carrying Amount, Land 3,400    
Accumulated Depreciation- Building $ (1,496)    
Year of Acquisition 2017    
Investment in Real Estate | Kensington Commons | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 23,040    
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 2,359    
Gross Carrying Amount, Land 3,960    
Accumulated Depreciation- Building $ (1,468)    
Year of Acquisition 2017    
Investment in Real Estate | Schirm Farms | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 21,847    
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 794    
Gross Carrying Amount, Land 1,460    
Accumulated Depreciation- Building $ (1,107)    
Year of Acquisition 2017    
Investment in Real Estate | Riverchase | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 18,044    
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 444    
Gross Carrying Amount, Land 1,060    
Accumulated Depreciation- Building $ (1,548)    
Year of Acquisition 2017    
Investment in Real Estate | Live Oak Trace | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 27,806    
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 436    
Gross Carrying Amount, Land 1,880    
Accumulated Depreciation- Building $ (722)    
Year of Acquisition 2017    
Investment in Real Estate | Tides at Calabash | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 12,650    
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    
Cost of Improvements, net of Retirements 1,819    
Gross Carrying Amount, Land 2,150    
Accumulated Depreciation- Building (1,709)    
Encumbrances (Unpaid Principal) $ (18,828)    
Year of Acquisition 2017    
Investment in Real Estate | Brunswick Point | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 30,033    
Investment in Real Estate | Creekside Corners      
Real Estate And Accumulated Depreciation [Line Items]      
Location Lithonia, GA    
Initial Cost, Land $ 6,140    
Initial Cost, Building 37,285    
Cost of Improvements, net of Retirements 4,486    
Gross Carrying Amount, Land 6,140    
Accumulated Depreciation- Building (2,504)    
Encumbrances (Unpaid Principal) $ (23,169)    
Year of Acquisition 2018    
Investment in Real Estate | Creekside Corners | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 41,771    
Investment in Real Estate | Hartshire Lakes      
Real Estate And Accumulated Depreciation [Line Items]      
Location Bargersville, IN    
Initial Cost, Land $ 3,070    
Initial Cost, Building 24,210    
Cost of Improvements, net of Retirements 960    
Gross Carrying Amount, Land 3,070    
Accumulated Depreciation- Building (1,310)    
Encumbrances (Unpaid Principal) $ (15,780)    
Year of Acquisition 2018    
Investment in Real Estate | Hartshire Lakes | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 25,170    
Investment in Real Estate | The Chelsea      
Real Estate And Accumulated Depreciation [Line Items]      
Location Columbus, OH    
Initial Cost, Land $ 2,739    
Initial Cost, Building 33,698    
Cost of Improvements, net of Retirements 450    
Gross Carrying Amount, Land 2,739    
Accumulated Depreciation- Building $ (1,679)    
Year of Acquisition 2018    
Investment in Real Estate | The Chelsea | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 34,148    
Investment in Real Estate | Avalon Oaks      
Real Estate And Accumulated Depreciation [Line Items]      
Location Columbus, OH    
Initial Cost, Land $ 4,189    
Initial Cost, Building 18,301    
Cost of Improvements, net of Retirements 1,306    
Gross Carrying Amount, Land 4,189    
Accumulated Depreciation- Building $ (1,014)    
Year of Acquisition 2018    
Investment in Real Estate | Avalon Oaks | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 19,607    
Investment in Real Estate | Bridgeview      
Real Estate And Accumulated Depreciation [Line Items]      
Location Tampa, FL    
Initial Cost, Land $ 10,671    
Initial Cost, Building 31,953    
Cost of Improvements, net of Retirements 4,611    
Gross Carrying Amount, Land 10,671    
Accumulated Depreciation- Building $ (1,415)    
Year of Acquisition 2018    
Investment in Real Estate | Bridgeview | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 36,564    
Investment in Real Estate | Collier Park      
Real Estate And Accumulated Depreciation [Line Items]      
Location Grove City, OH    
Initial Cost, Land $ 2,325    
Initial Cost, Building 18,688    
Cost of Improvements, net of Retirements 543    
Gross Carrying Amount, Land 2,325    
Accumulated Depreciation- Building $ (719)    
Year of Acquisition 2018    
Investment in Real Estate | Collier Park | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 19,231    
Investment in Real Estate | Waterford Landing      
Real Estate And Accumulated Depreciation [Line Items]      
Location McDonough, GA    
Initial Cost, Land $ 2,867    
Initial Cost, Building 27,477    
Cost of Improvements, net of Retirements 982    
Gross Carrying Amount, Land 2,867    
Accumulated Depreciation- Building (867)    
Encumbrances (Unpaid Principal) $ (15,292)    
Year of Acquisition 2018    
Investment in Real Estate | Waterford Landing | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 28,459    
Investment in Real Estate | Lucerne      
Real Estate And Accumulated Depreciation [Line Items]      
Location Brandon, FL    
Initial Cost, Land $ 3,114    
Initial Cost, Building 43,540    
Cost of Improvements, net of Retirements 1,981    
Gross Carrying Amount, Land 3,114    
Accumulated Depreciation- Building $ (1,328)    
Year of Acquisition 2018    
Investment in Real Estate | Lucerne | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 45,521    
Investment in Real Estate | North Park      
Real Estate And Accumulated Depreciation [Line Items]      
Location Stockbridge, GA    
Initial Cost, Land $ 2,848    
Initial Cost, Building 24,933    
Cost of Improvements, net of Retirements 521    
Gross Carrying Amount, Land 2,848    
Accumulated Depreciation- Building $ (427)    
Year of Acquisition 2019    
Investment in Real Estate | North Park | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 25,454    
Investment in Real Estate | Rocky Creek      
Real Estate And Accumulated Depreciation [Line Items]      
Location Tampa, FL    
Initial Cost, Land $ 15,669    
Initial Cost, Building 31,979    
Cost of Improvements, net of Retirements 119    
Gross Carrying Amount, Land 15,669    
Accumulated Depreciation- Building $ (336)    
Year of Acquisition 2019    
Investment in Real Estate | Rocky Creek | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 32,098    
Investment in Real Estate | Thornhill      
Real Estate And Accumulated Depreciation [Line Items]      
Location Raleigh, NC    
Initial Cost, Land $ 12,282    
Initial Cost, Building 40,197    
Cost of Improvements, net of Retirements 48    
Gross Carrying Amount, Land 12,282    
Accumulated Depreciation- Building $ (168)    
Year of Acquisition 2019    
Investment in Real Estate | Thornhill | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 40,245    
[1] Includes properties classified as held for sale as of December 31, 2018.