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Schedule III - Real Estate and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
 [1]
Real Estate And Accumulated Depreciation [Line Items]      
Balance, beginning of period $ 1,796,365 $ 1,745,640 [1] $ 1,504,156
Additions during period:      
Acquisitions 145,340 127,908 270,220
Improvements to land and building 35,783 45,623 41,587
Deductions during period:      
Dispositions of real estate (56,797) (121,865) (69,915)
Asset write-offs (3,921) (941) (408)
Balance, end of period 1,916,770 1,796,365 1,745,640
Balance, beginning of period 158,435 120,202 [1] 84,097
Depreciation expense 59,717 50,955 41,652
Dispositions of real estate (5,613) (11,781) (5,139)
Asset write-off (3,921) (941) (408)
Balance, end of period 208,618 $ 158,435 $ 120,202
Investment in Real Estate      
Real Estate And Accumulated Depreciation [Line Items]      
Initial Cost, Land 250,398    
Initial Cost, Building 1,527,536    
Cost of Improvements, Land 967    
Cost of Improvements, Building 137,869    
Gross Carrying Amount, Land 251,365    
Accumulated Depreciation- Building (208,618)    
Encumbrances (Unpaid Principal) (465,092)    
Investment in Real Estate | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 1,665,405    
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, Building 6,006    
Gross Carrying Amount, Land 3,254    
Accumulated Depreciation- Building (6,863)    
Encumbrances (Unpaid Principal) $ (5,996)    
Year of Acquisition 2011    
Investment in Real Estate | Crestmont Apartments | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 19,023    
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, Building 1,434    
Gross Carrying Amount, Land 3,079    
Accumulated Depreciation- Building (3,115)    
Encumbrances (Unpaid Principal) $ (8,745)    
Year of Acquisition 2012    
Investment in Real Estate | Runaway Bay Apartments | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 13,752    
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, Building 1,011    
Gross Carrying Amount, Land 1,677    
Accumulated Depreciation- Building $ (1,673)    
Year of Acquisition 2014    
Investment in Real Estate | Windrush | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 8,475    
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, Building 3,365    
Gross Carrying Amount, Land 4,234    
Accumulated Depreciation- Building $ (3,447)    
Year of Acquisition 2014    
Investment in Real Estate | Heritage Park | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 15,597    
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, Building 2,344    
Gross Carrying Amount, Land 3,503    
Accumulated Depreciation- Building $ (2,690)    
Year of Acquisition 2014    
Investment in Real Estate | Raindance | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 12,395    
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, Building 1,468    
Gross Carrying Amount, Land 1,296    
Accumulated Depreciation- Building $ (2,191)    
Year of Acquisition 2014    
Investment in Real Estate | Augusta | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 11,398    
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, Building 2,127    
Gross Carrying Amount, Land 1,924    
Accumulated Depreciation- Building $ (3,630)    
Year of Acquisition 2014    
Investment in Real Estate | Invitational | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 18,979    
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, Building 1,278    
Gross Carrying Amount, Land 2,513    
Accumulated Depreciation- Building (5,632)    
Encumbrances (Unpaid Principal) $ (19,862)    
Year of Acquisition 2014    
Investment in Real Estate | Kings Landing | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 31,151    
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, Building 2,307    
Gross Carrying Amount, Land 2,230    
Accumulated Depreciation- Building (4,684)    
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 $ 27,558    
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, Building 1,212    
Gross Carrying Amount, Land 3,480    
Accumulated Depreciation- Building (3,746)    
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 $ 21,694    
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, Building 7,852    
Gross Carrying Amount, Land 3,100    
Accumulated Depreciation- Building (6,662)    
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 $ 34,075    
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, Building 1,421    
Gross Carrying Amount, Land 2,400    
Accumulated Depreciation- Building (2,923)    
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 $ 16,249    
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, Building 1,001    
Gross Carrying Amount, Land 2,837    
Accumulated Depreciation- Building (2,035)    
Encumbrances (Unpaid Principal) $ (9,075)    
Year of Acquisition 2014    
Investment in Real Estate | Prospect Park | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 12,194    
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, Building 876    
Gross Carrying Amount, Land 3,947    
Accumulated Depreciation- Building (2,980)    
Encumbrances (Unpaid Principal) $ (13,229)    
Year of Acquisition 2014    
Investment in Real Estate | Brookside | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 17,379    
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, Building 10,775    
Gross Carrying Amount, Land 7,034    
Accumulated Depreciation- Building (8,467)    
Encumbrances (Unpaid Principal) $ (22,496)    
Year of Acquisition 2014    
Investment in Real Estate | Jamestown | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 38,505    
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, Building 9,898    
Gross Carrying Amount, Land 7,411    
Accumulated Depreciation- Building (10,262)    
Encumbrances (Unpaid Principal) $ (35,213)    
Year of Acquisition 2014    
Investment in Real Estate | Oxmoor | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 56,993    
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, Building 2,669    
Gross Carrying Amount, Land 6,857    
Accumulated Depreciation- Building (5,578)    
Encumbrances (Unpaid Principal) $ (23,838)    
Year of Acquisition 2014    
Investment in Real Estate | Meadows | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 32,699    
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, Building 1,733    
Gross Carrying Amount, Land 2,525    
Accumulated Depreciation- Building $ (3,888)    
Year of Acquisition 2015    
Investment in Real Estate | Bayview Club | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 24,239    
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, Building 3,721    
Gross Carrying Amount, Land 2,100    
Accumulated Depreciation- Building $ (3,797)    
Year of Acquisition 2015    
Investment in Real Estate | Arbors River Oaks | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 22,766    
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, Building 963    
Gross Carrying Amount, Land 3,450    
Accumulated Depreciation- Building (4,860)    
Encumbrances (Unpaid Principal) $ (24,561)    
Year of Acquisition 2015    
Investment in Real Estate | Aston | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 35,296    
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, Building 1,313    
Gross Carrying Amount, Land 5,500    
Accumulated Depreciation- Building (5,948)    
Encumbrances (Unpaid Principal) $ (30,309)    
Year of Acquisition 2015    
Investment in Real Estate | Avenues At Craig Ranch | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 43,367    
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, Building 780    
Gross Carrying Amount, Land 1,500    
Accumulated Depreciation- Building $ (2,225)    
Year of Acquisition 2015    
Investment in Real Estate | Bridge Pointe | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 15,086    
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, Building 861    
Gross Carrying Amount, Land 5,376    
Accumulated Depreciation- Building (4,630)    
Encumbrances (Unpaid Principal) $ (21,234)    
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 $ 33,588    
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, Building 682    
Gross Carrying Amount, Land 4,368    
Accumulated Depreciation- Building (5,123)    
Encumbrances (Unpaid Principal) $ (22,134)    
Year of Acquisition 2015    
Investment in Real Estate | Fountains Southend | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 37,936    
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, Building 2,988    
Gross Carrying Amount, Land 5,700    
Accumulated Depreciation- Building $ (3,926)    
Year of Acquisition 2015    
Investment in Real Estate | Fox Trails | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 24,932    
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, Building 1,860    
Gross Carrying Amount, Land 5,500    
Accumulated Depreciation- Building $ (6,148)    
Year of Acquisition 2015    
Investment in Real Estate | Millenia 700 | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 43,612    
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, Building 919    
Gross Carrying Amount, Land 3,300    
Accumulated Depreciation- Building $ (7,321)    
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 $ 54,423    
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, Building 8,480    
Gross Carrying Amount, Land 11,100    
Accumulated Depreciation- Building $ (8,252)    
Year of Acquisition 2015    
Investment in Real Estate | Pointe At Canyon Ridge | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 45,475    
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, Building 923    
Gross Carrying Amount, Land 3,780    
Accumulated Depreciation- Building $ (4,054)    
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 $ 28,618    
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, Building 899    
Gross Carrying Amount, Land 5,480    
Accumulated Depreciation- Building (5,796)    
Encumbrances (Unpaid Principal) $ (30,971)    
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 $ 42,308    
Investment in Real Estate | Village at Auburn Hills      
Real Estate And Accumulated Depreciation [Line Items]      
Location Durham, NC    
Initial Cost, Land $ 5,621    
Initial Cost, Building 36,923    
Cost of Improvements, Building 7,645    
Gross Carrying Amount, Land 5,621    
Accumulated Depreciation- Building $ (6,077)    
Year of Acquisition 2017    
Investment in Real Estate | Village at Auburn Hills | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 44,568    
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, Building 665    
Gross Carrying Amount, Land 3,100    
Accumulated Depreciation- Building $ (1,016)    
Year of Acquisition 2015    
Investment in Real Estate | Vue At Knoll Trail | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 6,742    
Investment in Real Estate | Commons at Canal Winchester      
Real Estate And Accumulated Depreciation [Line Items]      
Location Canal Winchester, OH    
Initial Cost, Land $ 3,400    
Initial Cost, Building 20,703    
Cost of Improvements, Building 3,441    
Gross Carrying Amount, Land 3,400    
Accumulated Depreciation- Building $ (2,581)    
Year of Acquisition 2017    
Investment in Real Estate | Commons at Canal Winchester | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 24,144    
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, Building 733    
Gross Carrying Amount, Land 4,200    
Accumulated Depreciation- Building (4,811)    
Encumbrances (Unpaid Principal) $ (11,850)    
Year of Acquisition 2015    
Investment in Real Estate | Waterstone at Brier Creek | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 35,384    
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, Building 740    
Gross Carrying Amount, Land 7,600    
Accumulated Depreciation- Building (8,395)    
Encumbrances (Unpaid Principal) $ (48,285)    
Year of Acquisition 2015    
Investment in Real Estate | Waterstone Big Creek | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 62,711    
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, Building 975    
Gross Carrying Amount, Land 2,750    
Accumulated Depreciation- Building $ (3,728)    
Year of Acquisition 2015    
Investment in Real Estate | Westmont Commons | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 26,200    
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, Building 1,378    
Gross Carrying Amount, Land 3,898    
Accumulated Depreciation- Building $ (2,891)    
Year of Acquisition 2017    
Investment in Real Estate | Lakes at Northdale | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 26,921    
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, Building 1,703    
Gross Carrying Amount, Land 3,927    
Accumulated Depreciation- Building $ (1,575)    
Year of Acquisition 2017    
Investment in Real Estate | Haverford Place | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 11,803    
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, Building 1,523    
Gross Carrying Amount, Land 550    
Accumulated Depreciation- Building $ (1,711)    
Year of Acquisition 2017    
Investment in Real Estate | Cherry Grove | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 16,892    
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, Building 2,886    
Gross Carrying Amount, Land 3,960    
Accumulated Depreciation- Building $ (2,464)    
Year of Acquisition 2017    
Investment in Real Estate | Schirm Farms | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 22,374    
Investment in Real Estate | Vantage on Hillsborough      
Real Estate And Accumulated Depreciation [Line Items]      
Location Tampa, FL    
Initial Cost, Land $ 10,671    
Initial Cost, Building 31,953    
Cost of Improvements, Land 967    
Cost of Improvements, Building 7,853    
Gross Carrying Amount, Land 11,638    
Accumulated Depreciation- Building $ (3,374)    
Year of Acquisition 2018    
Investment in Real Estate | Vantage on Hillsborough | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 39,806    
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, Building 1,014    
Gross Carrying Amount, Land 1,460    
Accumulated Depreciation- Building $ (1,704)    
Year of Acquisition 2017    
Investment in Real Estate | Riverchase | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 18,264    
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, Building 536    
Gross Carrying Amount, Land 1,880    
Accumulated Depreciation- Building $ (1,117)    
Year of Acquisition 2017    
Investment in Real Estate | Tides at Calabash | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 12,750    
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, Building 2,146    
Gross Carrying Amount, Land 2,150    
Accumulated Depreciation- Building (2,810)    
Encumbrances (Unpaid Principal) $ (18,522)    
Year of Acquisition 2017    
Investment in Real Estate | Brunswick Point | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 30,360    
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, Building 5,987    
Gross Carrying Amount, Land 6,140    
Accumulated Depreciation- Building (4,408)    
Encumbrances (Unpaid Principal) $ (22,796)    
Year of Acquisition 2018    
Investment in Real Estate | Creekside Corners | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 43,272    
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, Building 1,236    
Gross Carrying Amount, Land 3,070    
Accumulated Depreciation- Building (2,127)    
Encumbrances (Unpaid Principal) $ (15,532)    
Year of Acquisition 2018    
Investment in Real Estate | Hartshire Lakes | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 25,446    
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, Building 661    
Gross Carrying Amount, Land 2,739    
Accumulated Depreciation- Building $ (2,630)    
Year of Acquisition 2018    
Investment in Real Estate | The Chelsea | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 34,359    
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, Building 3,096    
Gross Carrying Amount, Land 4,189    
Accumulated Depreciation- Building $ (1,780)    
Year of Acquisition 2018    
Investment in Real Estate | Avalon Oaks | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 21,397    
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, Building 757    
Gross Carrying Amount, Land 2,325    
Accumulated Depreciation- Building $ (1,311)    
Year of Acquisition 2018    
Investment in Real Estate | Collier Park | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 19,445    
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, Building 2,551    
Gross Carrying Amount, Land 2,867    
Accumulated Depreciation- Building (1,888)    
Encumbrances (Unpaid Principal) $ (15,058)    
Year of Acquisition 2018    
Investment in Real Estate | Waterford Landing | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 30,028    
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, Building 3,589    
Gross Carrying Amount, Land 3,114    
Accumulated Depreciation- Building $ (3,006)    
Year of Acquisition 2018    
Investment in Real Estate | Lucerne | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 47,129    
Investment in Real Estate | The Adley      
Real Estate And Accumulated Depreciation [Line Items]      
Location McKinney, TX    
Initial Cost, Land $ 4,673    
Initial Cost, Building 46,389    
Cost of Improvements, Building 39    
Gross Carrying Amount, Land 4,673    
Accumulated Depreciation- Building $ (969)    
Year of Acquisition 2020    
Investment in Real Estate | The Adley | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 46,428    
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, Building 1,613    
Gross Carrying Amount, Land 2,848    
Accumulated Depreciation- Building $ (1,231)    
Year of Acquisition 2019    
Investment in Real Estate | North Park | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 26,546    
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, Building 989    
Gross Carrying Amount, Land 15,669    
Accumulated Depreciation- Building $ (1,229)    
Year of Acquisition 2019    
Investment in Real Estate | Rocky Creek | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 32,968    
Investment in Real Estate | Thornhill      
Real Estate And Accumulated Depreciation [Line Items]      
Location Raleigh, NC    
Initial Cost, Land $ 12,282    
Initial Cost, Building 40,207    
Cost of Improvements, Building 947    
Gross Carrying Amount, Land 12,282    
Accumulated Depreciation- Building $ (1,239)    
Year of Acquisition 2019    
Investment in Real Estate | Thornhill | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 41,154    
Investment in Real Estate | Legacy at Jones Farm      
Real Estate And Accumulated Depreciation [Line Items]      
Location Huntsville, AL    
Initial Cost, Land $ 14,860    
Initial Cost, Building 78,552    
Gross Carrying Amount, Land $ 14,860    
Year of Acquisition 2020    
Investment in Real Estate | Legacy at Jones Farm | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 78,552    
[1] Includes properties classified as held for sale as of December 31, 2018.