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Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 1,215,376      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 199,381      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,548,367      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 54,920      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 200,385      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,602,283      
SEC Schedule III, Real Estate, Gross, Total 1,802,668 $ 1,452,759 $ 1,029,214 $ 556,820
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance 108,911 55,177 $ 42,137 $ 23,437
Line of Credit Facility, Outstanding 82,209 $ 67,670    
Enders Place at Baldwin Park [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 23,822      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 4,750      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 20,171      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,341      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,454      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 24,808      
SEC Schedule III, Real Estate, Gross, Total 30,262      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 5,454      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2012      
Enders Place at Baldwin Park [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Enders Place at Baldwin Park [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
ARIUM Grandewood [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 39,385      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 5,200      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 37,220      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,498      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,200      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 38,718      
SEC Schedule III, Real Estate, Gross, Total 43,918      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 5,432      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2014      
ARIUM Grandewood [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
ARIUM Grandewood [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Park And Kingston [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 18,432      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 3,060      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 24,353      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,091      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,360      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 27,144      
SEC Schedule III, Real Estate, Gross, Total 30,504      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 3,564      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2015      
Park And Kingston [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Park And Kingston [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Ashton I [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 30,878      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 4,000      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 40,944      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 348      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,000      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 41,292      
SEC Schedule III, Real Estate, Gross, Total 45,292      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 4,973      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2015      
Ashton I [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Ashton I [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
ARIUM Palms [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 30,320      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 4,030      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 32,248      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,287      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,030      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 33,535      
SEC Schedule III, Real Estate, Gross, Total 37,565      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 4,530      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2015      
ARIUM Palms [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
ARIUM Palms [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Sorrel [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 38,684      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 6,710      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 47,444      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 524      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,710      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 47,968      
SEC Schedule III, Real Estate, Gross, Total 54,678      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 6,488      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2015      
Sorrel [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Sorrel [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Sovereign [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 28,227      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 2,800      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 40,609      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 383      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,800      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 40,992      
SEC Schedule III, Real Estate, Gross, Total 43,792      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 5,343      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2015      
Sovereign [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Sovereign [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Ashton II [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 15,213      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,900      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 19,517      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 134      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,900      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 19,651      
SEC Schedule III, Real Estate, Gross, Total 21,551      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 2,105      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2015      
Ashton II [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Ashton II [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
ARIUM at Palmer Ranch [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 41,348      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 7,800      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 30,597      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,836      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 7,800      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 34,433      
SEC Schedule III, Real Estate, Gross, Total 42,233      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 3,776      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2016      
ARIUM at Palmer Ranch [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
ARIUM at Palmer Ranch [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
ARIUM Gulfshore [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances [1] $ 0      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 10,000      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 36,047      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,627      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 10,000      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 39,674      
SEC Schedule III, Real Estate, Gross, Total 49,674      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 4,357      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2016      
ARIUM Gulfshore [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
ARIUM Gulfshore [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
The Preserve at Henderson Beach [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 35,602      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 4,100      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 50,117      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,846      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,100      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 51,963      
SEC Schedule III, Real Estate, Gross, Total 56,063      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 4,754      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2016      
The Preserve at Henderson Beach [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
The Preserve at Henderson Beach [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
ARIUM Westside [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 52,150      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 8,657      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 63,402      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,403      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,657      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 65,805      
SEC Schedule III, Real Estate, Gross, Total 74,462      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 5,065      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2016      
ARIUM Westside [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
ARIUM Westside [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
ARIUM Glenridge [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 49,500      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 14,513      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 52,324      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,943      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 14,513      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 59,267      
SEC Schedule III, Real Estate, Gross, Total 73,780      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 4,340      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2016      
ARIUM Glenridge [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
ARIUM Glenridge [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
ARIUM Pine Lakes [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 26,950      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 5,760      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 31,854      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,488      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,760      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 33,342      
SEC Schedule III, Real Estate, Gross, Total 39,102      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 3,417      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2016      
ARIUM Pine Lakes [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
ARIUM Pine Lakes [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
The Brodie [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 34,825      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 5,400      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 42,497      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,966      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,400      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 44,463      
SEC Schedule III, Real Estate, Gross, Total 49,863      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 3,812      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2016      
The Brodie [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
The Brodie [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Roswell City Walk [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 51,000      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 8,423      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 66,249      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 199      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,423      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 66,448      
SEC Schedule III, Real Estate, Gross, Total 74,871      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 4,723      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2016      
Roswell City Walk [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Roswell City Walk [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
James On South First [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 26,500      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 3,500      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 32,471      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 653      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,500      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 33,124      
SEC Schedule III, Real Estate, Gross, Total 36,624      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 2,381      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2016      
James On South First [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
James On South First [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Preston View [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 41,657      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 8,800      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 49,610      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 846      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,800      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 50,456      
SEC Schedule III, Real Estate, Gross, Total 59,256      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 3,302      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
Preston View [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Preston View [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Wesley Village [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 40,545      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 5,600      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 50,062      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,404      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,600      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 51,466      
SEC Schedule III, Real Estate, Gross, Total 57,066      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 2,718      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
Wesley Village [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Wesley Village [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Wesley Village II [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 0      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 270      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 270      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4      
SEC Schedule III, Real Estate, Gross, Total 274      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 0      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
Wesley Village II [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Wesley Village II [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Marquis at Crown Ridge [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 28,634      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 4,000      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 35,209      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,372      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,000      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 36,581      
SEC Schedule III, Real Estate, Gross, Total 40,581      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 1,987      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
Marquis at Crown Ridge [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Marquis at Crown Ridge [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Marquis at Stone Oak [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 42,725      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 4,400      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 50,548      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,797      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,400      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 52,345      
SEC Schedule III, Real Estate, Gross, Total 56,745      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 3,089      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
Marquis at Stone Oak [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Marquis at Stone Oak [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Marquis at the Cascades I [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 32,899      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 3,200      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 41,120      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 989      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,200      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 42,109      
SEC Schedule III, Real Estate, Gross, Total 45,309      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 2,227      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
Marquis at the Cascades I [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Marquis at the Cascades I [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Marquis at The Cascades II [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 22,960      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 2,450      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 25,827      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 909      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,450      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 26,736      
SEC Schedule III, Real Estate, Gross, Total 29,186      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 1,440      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
Marquis at The Cascades II [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Marquis at The Cascades II [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Marquis at TPC [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 16,826      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,900      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 18,795      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 668      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,900      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 19,463      
SEC Schedule III, Real Estate, Gross, Total 21,363      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 1,211      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
Marquis at TPC [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Marquis at TPC [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Villages at Cypress Creek [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 26,200      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 4,650      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 35,990      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,787      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,650      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 37,777      
SEC Schedule III, Real Estate, Gross, Total 42,427      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 1,717      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
Villages at Cypress Creek [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Villages at Cypress Creek [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Citrus Tower [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 41,438      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 5,208      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 49,388      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,072      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,208      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 50,460      
SEC Schedule III, Real Estate, Gross, Total 55,668      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 2,354      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
Citrus Tower [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Citrus Tower [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Outlook at Greystone [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 22,105      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 3,950      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 31,664      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,013      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,950      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 33,677      
SEC Schedule III, Real Estate, Gross, Total 37,627      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 1,383      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
Outlook at Greystone [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Outlook at Greystone [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
ARIUM Hunter's Creek [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 72,294      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 9,600      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 86,202      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,629      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 9,600      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 87,831      
SEC Schedule III, Real Estate, Gross, Total 97,431      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 3,555      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
ARIUM Hunter's Creek [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
ARIUM Hunter's Creek [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
ARIUM Metrowest [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 64,559      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 10,200      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 74,768      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,205      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 10,200      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 75,973      
SEC Schedule III, Real Estate, Gross, Total 86,173      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 3,217      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
ARIUM Metrowest [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
ARIUM Metrowest [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
The Mills [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 26,298      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 3,300      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 36,969      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 466      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,300      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 37,435      
SEC Schedule III, Real Estate, Gross, Total 40,735      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 1,358      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
The Mills [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
The Mills [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
The Links at Plum Creek [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 40,000      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 2,960      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 57,803      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,877      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,960      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 59,680      
SEC Schedule III, Real Estate, Gross, Total 62,640      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 1,803      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2018      
The Links at Plum Creek [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
The Links at Plum Creek [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Sands Parc [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances [1] $ 0      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 3,170      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 42,443      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 109      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,170      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 42,552      
SEC Schedule III, Real Estate, Gross, Total 45,722      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 953      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2018      
Sands Parc [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Sands Parc [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Plantation Park [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 26,625      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,600      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 34,065      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 41      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,600      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 34,106      
SEC Schedule III, Real Estate, Gross, Total 35,706      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 672      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2018      
Plantation Park [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Plantation Park [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Veranda at Centerfield [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 26,100      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 5,120      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 35,506      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,070      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,120      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 36,576      
SEC Schedule III, Real Estate, Gross, Total 41,696      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 578      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2018      
Veranda at Centerfield [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Veranda at Centerfield [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Ashford Belmar [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 100,675      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 18,400      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 124,149      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 24      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 18,400      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 124,173      
SEC Schedule III, Real Estate, Gross, Total 142,573      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 782      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2018      
Ashford Belmar [Member] | Real Estate Held For Investment [Member] | Maximum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Ashford Belmar [Member] | Real Estate Held For Investment [Member] | Minimum [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 3 years      
Subtotal [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 1,215,376      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 199,381      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,548,182      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 54,849      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 200,385      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,602,027      
SEC Schedule III, Real Estate, Gross, Total 1,802,412      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance 108,860      
Subtotal [Member] | Property Under Development [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 0      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 185      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 71      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 0      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 256      
SEC Schedule III, Real Estate, Gross, Total 256      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance 51      
REIT Operator [Member] | Property Under Development [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 0      
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 185      
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 71      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 0      
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 256      
SEC Schedule III, Real Estate, Gross, Total 256      
SEC Schedule III, Real Estate Accumulated Depreciation, Ending Balance $ 51      
SEC Schedule III, Real Estate and Accumulated Depreciation, Year of Acquisition 2017      
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
ARIUM Gulfshore and Sands Parc [Member] | Real Estate Held For Investment [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Line of Credit Facility, Outstanding $ 67,700      
[1] ARIUM Gulfshore and Sands Parc were funded, in part, by a secured credit facility. As of December 31, 2018, the outstanding credit facility balance is $67.7 million.