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Schedule III - Real Estate and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [2]
Real Estate And Accumulated Depreciation [Line Items]      
Balance, beginning of period $ 1,504,156 [1] $ 1,319,350 [2] $ 1,372,015
Additions during period:      
Acquisitions 270,220 [1] 241,071  
Improvements to land and building 41,587 [1] 14,368 10,664
Deductions during period:      
Dispositions of real estate (69,915) [1] (70,633) (63,329)
Asset write-offs [1] (408)    
Balance, end of period 1,745,640 [1] 1,504,156 [1] 1,319,350
Balance, beginning of period 84,097 [1] 60,719 [2] 39,638
Depreciation expense 41,652 [1] 32,586 31,085
Dispositions of real estate (5,139) [1] (9,208) (10,004)
Balance, end of period 120,202 [1] $ 84,097 [1] $ 60,719
Investment in Real Estate      
Real Estate And Accumulated Depreciation [Line Items]      
Initial Cost, Land 219,941    
Initial Cost, Building 1,455,034    
Cost of Improvements, net of Retirements 70,665    
Gross Carrying Amount, Land 219,941    
Accumulated Depreciation- Building (120,202)    
Encumbrances (Unpaid Principal) (585,672)    
Investment in Real Estate | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 1,525,699    
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 4,714    
Gross Carrying Amount, Land 3,254    
Accumulated Depreciation- Building (4,361)    
Encumbrances (Unpaid Principal) $ (6,218)    
Year of Acquisition 2011    
Investment in Real Estate | Crestmont Apartments | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 17,731    
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 1,010    
Gross Carrying Amount, Land 3,079    
Accumulated Depreciation- Building (2,293)    
Encumbrances (Unpaid Principal) $ (9,206)    
Year of Acquisition 2012    
Investment in Real Estate | Runaway Bay Apartments | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 13,328    
Investment in Real Estate | Reserve at Eagle Ridge      
Real Estate And Accumulated Depreciation [Line Items]      
Location [3] Waukegan, IL    
Initial Cost, Land [3] $ 5,800    
Initial Cost, Building [3] 22,743    
Cost of Improvements, net of Retirements [3] 1,346    
Gross Carrying Amount, Land [3] 5,800    
Accumulated Depreciation- Building [3] (2,862)    
Encumbrances (Unpaid Principal) [3] $ (18,850)    
Year of Acquisition [3] 2014    
Investment in Real Estate | Reserve at Eagle Ridge | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building [3] $ 24,089    
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 649    
Gross Carrying Amount, Land 1,677    
Accumulated Depreciation- Building $ (1,135)    
Year of Acquisition 2014    
Investment in Real Estate | Windrush | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 8,113    
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 2,111    
Gross Carrying Amount, Land 4,234    
Accumulated Depreciation- Building $ (2,204)    
Year of Acquisition 2014    
Investment in Real Estate | Heritage Park | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 14,343    
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 1,746    
Gross Carrying Amount, Land 3,503    
Accumulated Depreciation- Building $ (1,826)    
Year of Acquisition 2014    
Investment in Real Estate | Raindance | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 11,797    
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 953    
Gross Carrying Amount, Land 1,296    
Accumulated Depreciation- Building $ (1,526)    
Year of Acquisition 2014    
Investment in Real Estate | Augusta | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 10,883    
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 1,161    
Gross Carrying Amount, Land 1,924    
Accumulated Depreciation- Building $ (2,511)    
Year of Acquisition 2014    
Investment in Real Estate | Invitational | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 18,013    
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 961    
Gross Carrying Amount, Land 2,513    
Accumulated Depreciation- Building (3,797)    
Encumbrances (Unpaid Principal) $ (20,619)    
Year of Acquisition 2014    
Investment in Real Estate | Kings Landing | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 30,834    
Investment in Real Estate | Carrington      
Real Estate And Accumulated Depreciation [Line Items]      
Location [3] Little Rock, AR    
Initial Cost, Land [3] $ 1,715    
Initial Cost, Building [3] 19,526    
Cost of Improvements, net of Retirements [3] 1,823    
Gross Carrying Amount, Land [3] 1,715    
Accumulated Depreciation- Building [3] (2,445)    
Encumbrances (Unpaid Principal) [3] $ (14,235)    
Year of Acquisition [3] 2014    
Investment in Real Estate | Carrington | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building [3] $ 21,349    
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 1,285    
Gross Carrying Amount, Land 2,230    
Accumulated Depreciation- Building (3,234)    
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 $ 26,536    
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 900    
Gross Carrying Amount, Land 3,480    
Accumulated Depreciation- Building (2,544)    
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 $ 21,382    
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 2,779    
Gross Carrying Amount, Land 3,100    
Accumulated Depreciation- Building (3,454)    
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 $ 29,002    
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 1,044    
Gross Carrying Amount, Land 2,400    
Accumulated Depreciation- Building (1,926)    
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 $ 15,872    
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 540    
Gross Carrying Amount, Land 2,837    
Accumulated Depreciation- Building (1,262)    
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 $ 11,733    
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 887    
Gross Carrying Amount, Land 3,947    
Accumulated Depreciation- Building (1,907)    
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 $ 17,389    
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 7,551    
Gross Carrying Amount, Land 7,034    
Accumulated Depreciation- Building (3,960)    
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 $ 35,281    
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 3,798    
Gross Carrying Amount, Land 7,411    
Accumulated Depreciation- Building (5,370)    
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 $ 50,893    
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 1,782    
Gross Carrying Amount, Land 6,857    
Accumulated Depreciation- Building (3,513)    
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 $ 31,812    
Investment in Real Estate | Stonebridge At The Ranch      
Real Estate And Accumulated Depreciation [Line Items]      
Location [3] Little Rock, AR    
Initial Cost, Land [3] $ 3,315    
Initial Cost, Building [3] 27,954    
Cost of Improvements, net of Retirements [3] 995    
Gross Carrying Amount, Land [3] 3,315    
Accumulated Depreciation- Building [3] (2,625)    
Encumbrances (Unpaid Principal) [3] $ (20,527)    
Year of Acquisition [3] 2014    
Investment in Real Estate | Stonebridge At The Ranch | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building [3] $ 28,949    
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 1,163    
Gross Carrying Amount, Land 5,860    
Accumulated Depreciation- Building (3,295)    
Encumbrances (Unpaid Principal) $ (22,900)    
Year of Acquisition 2014    
Investment in Real Estate | Iron Rock Ranch | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 30,074    
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 1,372    
Gross Carrying Amount, Land 2,525    
Accumulated Depreciation- Building $ (2,388)    
Year of Acquisition 2015    
Investment in Real Estate | Bayview Club | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 23,878    
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 1,480    
Gross Carrying Amount, Land 2,100    
Accumulated Depreciation- Building $ (1,896)    
Year of Acquisition 2015    
Investment in Real Estate | Arbors River Oaks | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 20,525    
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 424    
Gross Carrying Amount, Land 3,450    
Accumulated Depreciation- Building (2,887)    
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 $ 34,757    
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 566    
Gross Carrying Amount, Land 5,500    
Accumulated Depreciation- Building (3,536)    
Encumbrances (Unpaid Principal) $ (31,250)    
Year of Acquisition 2015    
Investment in Real Estate | Avenues At Craig Ranch | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 42,620    
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 512    
Gross Carrying Amount, Land 1,500    
Accumulated Depreciation- Building $ (1,293)    
Year of Acquisition 2015    
Investment in Real Estate | Bridge Pointe | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 14,818    
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 386    
Gross Carrying Amount, Land 5,376    
Accumulated Depreciation- Building (2,766)    
Encumbrances (Unpaid Principal) $ (22,136)    
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 $ 33,113    
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 418    
Gross Carrying Amount, Land 4,368    
Accumulated Depreciation- Building (3,089)    
Encumbrances (Unpaid Principal) $ (22,975)    
Year of Acquisition 2015    
Investment in Real Estate | Fountains Southend | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 37,672    
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 1,452    
Gross Carrying Amount, Land 5,700    
Accumulated Depreciation- Building $ (2,082)    
Year of Acquisition 2015    
Investment in Real Estate | Fox Trails | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 23,396    
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 723    
Gross Carrying Amount, Land 925    
Accumulated Depreciation- Building $ (968)    
Year of Acquisition 2015    
Investment in Real Estate | Lakeshore on the Hill | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 10,935    
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 921    
Gross Carrying Amount, Land 5,500    
Accumulated Depreciation- Building (3,552)    
Encumbrances (Unpaid Principal) $ (28,746)    
Year of Acquisition 2015    
Investment in Real Estate | Millenia 700 | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 42,673    
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 364    
Gross Carrying Amount, Land 3,300    
Accumulated Depreciation- Building $ (4,442)    
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 $ 53,868    
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 5,314    
Gross Carrying Amount, Land 11,100    
Accumulated Depreciation- Building $ (3,883)    
Year of Acquisition 2015    
Investment in Real Estate | Pointe At Canyon Ridge | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 42,309    
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 609    
Gross Carrying Amount, Land 3,780    
Accumulated Depreciation- Building $ (2,450)    
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 $ 28,304    
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 441    
Gross Carrying Amount, Land 5,480    
Accumulated Depreciation- Building (3,500)    
Encumbrances (Unpaid Principal) $ (32,229)    
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 $ 41,850    
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 715    
Gross Carrying Amount, Land 1,200    
Accumulated Depreciation- Building $ (1,215)    
Year of Acquisition 2015    
Investment in Real Estate | Trails At Signal Mountain | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 13,610    
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 259    
Gross Carrying Amount, Land 3,100    
Accumulated Depreciation- Building $ (570)    
Year of Acquisition 2015    
Investment in Real Estate | Vue At Knoll Trail | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 6,336    
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 320    
Gross Carrying Amount, Land 4,200    
Accumulated Depreciation- Building (2,899)    
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 $ 34,971    
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 325    
Gross Carrying Amount, Land 7,600    
Accumulated Depreciation- Building (5,114)    
Encumbrances (Unpaid Principal) $ (49,680)    
Year of Acquisition 2015    
Investment in Real Estate | Waterstone Big Creek | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 62,296    
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 531    
Gross Carrying Amount, Land 2,750    
Accumulated Depreciation- Building $ (2,207)    
Year of Acquisition 2015    
Investment in Real Estate | Westmont Commons | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 25,756    
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 708    
Gross Carrying Amount, Land 3,898    
Accumulated Depreciation- Building $ (1,270)    
Year of Acquisition 2017    
Investment in Real Estate | Lakes at Northdale | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 26,251    
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 1,010    
Gross Carrying Amount, Land 3,927    
Accumulated Depreciation- Building $ (539)    
Year of Acquisition 2017    
Investment in Real Estate | Haverford Place | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 11,110    
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 4,615    
Gross Carrying Amount, Land 5,621    
Accumulated Depreciation- Building $ (1,759)    
Year of Acquisition 2017    
Investment in Real Estate | South Terrace | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 41,538    
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 710    
Gross Carrying Amount, Land 550    
Accumulated Depreciation- Building $ (553)    
Year of Acquisition 2017    
Investment in Real Estate | Cherry Grove | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 16,079    
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 732    
Gross Carrying Amount, Land 3,400    
Accumulated Depreciation- Building $ (699)    
Year of Acquisition 2017    
Investment in Real Estate | Kensington Commons | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 21,435    
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 972    
Gross Carrying Amount, Land 3,960    
Accumulated Depreciation- Building $ (660)    
Year of Acquisition 2017    
Investment in Real Estate | Schirm Farms | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 20,460    
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 393    
Gross Carrying Amount, Land 1,460    
Accumulated Depreciation- Building $ (563)    
Year of Acquisition 2017    
Investment in Real Estate | Riverchase | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 17,643    
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 188    
Gross Carrying Amount, Land 1,060    
Accumulated Depreciation- Building $ (813)    
Year of Acquisition 2017    
Investment in Real Estate | Live Oak Trace | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 27,550    
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 265    
Gross Carrying Amount, Land 1,880    
Accumulated Depreciation- Building $ (352)    
Year of Acquisition 2017    
Investment in Real Estate | Tides at Calabash | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 12,479    
Investment in Real Estate | Creekside Corners      
Real Estate And Accumulated Depreciation [Line Items]      
Location Lithonia, GA    
Initial Cost, Land $ 6,140    
Initial Cost, Building 37,282    
Cost of Improvements, net of Retirements 2,305    
Gross Carrying Amount, Land 6,140    
Accumulated Depreciation- Building (965)    
Encumbrances (Unpaid Principal) $ (23,500)    
Year of Acquisition 2018    
Investment in Real Estate | Creekside Corners | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 39,587    
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 795    
Gross Carrying Amount, Land 2,150    
Accumulated Depreciation- Building (749)    
Encumbrances (Unpaid Principal) $ (19,000)    
Year of Acquisition 2017    
Investment in Real Estate | Brunswick Point | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 29,009    
Investment in Real Estate | Hartshire Lakes      
Real Estate And Accumulated Depreciation [Line Items]      
Location Bargersville, IN    
Initial Cost, Land $ 3,070    
Initial Cost, Building 24,206    
Cost of Improvements, net of Retirements 308    
Gross Carrying Amount, Land 3,070    
Accumulated Depreciation- Building (575)    
Encumbrances (Unpaid Principal) $ (16,000)    
Year of Acquisition 2018    
Investment in Real Estate | Hartshire Lakes | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 24,514    
Investment in Real Estate | The Chelsea      
Real Estate And Accumulated Depreciation [Line Items]      
Location Columbus, OH    
Initial Cost, Land $ 2,739    
Initial Cost, Building 33,694    
Cost of Improvements, net of Retirements 170    
Gross Carrying Amount, Land 2,739    
Accumulated Depreciation- Building $ (779)    
Year of Acquisition 2018    
Investment in Real Estate | The Chelsea | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 33,864    
Investment in Real Estate | Avalon Oaks      
Real Estate And Accumulated Depreciation [Line Items]      
Location Columbus, OH    
Initial Cost, Land $ 4,189    
Initial Cost, Building 18,297    
Cost of Improvements, net of Retirements 857    
Gross Carrying Amount, Land 4,189    
Accumulated Depreciation- Building $ (397)    
Year of Acquisition 2018    
Investment in Real Estate | Avalon Oaks | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 19,154    
Investment in Real Estate | Bridgeview      
Real Estate And Accumulated Depreciation [Line Items]      
Location Tampa, FL    
Initial Cost, Land $ 10,671    
Initial Cost, Building 31,949    
Cost of Improvements, net of Retirements 134    
Gross Carrying Amount, Land 10,671    
Accumulated Depreciation- Building $ (336)    
Year of Acquisition 2018    
Investment in Real Estate | Bridgeview | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 32,083    
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 18,676    
Cost of Improvements, net of Retirements 109    
Gross Carrying Amount, Land 2,325    
Accumulated Depreciation- Building $ (197)    
Year of Acquisition 2018    
Investment in Real Estate | Collier Park | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 18,785    
Investment in Real Estate | Waterford Landing      
Real Estate And Accumulated Depreciation [Line Items]      
Location McDonough, GA    
Initial Cost, Land $ 2,867    
Initial Cost, Building 27,467    
Cost of Improvements, net of Retirements 57    
Gross Carrying Amount, Land 2,867    
Accumulated Depreciation- Building (114)    
Encumbrances (Unpaid Principal) $ (15,500)    
Year of Acquisition 2018    
Investment in Real Estate | Waterford Landing | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 27,524    
Investment in Real Estate | Lucerne      
Real Estate And Accumulated Depreciation [Line Items]      
Location Brandon, FL    
Initial Cost, Land $ 3,114    
Initial Cost, Building 43,537    
Cost of Improvements, net of Retirements 7    
Gross Carrying Amount, Land 3,114    
Accumulated Depreciation- Building $ (95)    
Year of Acquisition 2018    
Investment in Real Estate | Lucerne | Building      
Real Estate And Accumulated Depreciation [Line Items]      
Gross Carrying Amount, Building $ 43,544    
[1] Includes properties classified as held for sale as of December 31, 2018.
[2] Includes properties classified as held for sale as of December 31, 2016.
[3] This property was classified as held for sale as of December 31, 2018.