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Debt - Summary of Notes Payable (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Other	$ 857	$ 909
Unsecured financing, net of unamortized deferred financing charges of $0 and $0, respectively	595	595
Notes payable- due to affiliates, unsecured, net of $0.8 million and $0.8 million discount and unamortized deferred financing charges, respectively	4,935	4,903
Total	15,563	18,930
Construction Loans [Member] | Construction Revolvers [Member]
Debt Instrument [Line Items]
Debt instrument, gross	1,883	2,220
Development and Acquisition Notes [Member]
Debt Instrument [Line Items]
Debt instrument, gross	7,293	10,290
Line of Credit [Member]
Debt Instrument [Line Items]
Debt instrument, gross	0	13
Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, gross	$ 10,033	$ 13,432

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