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Debt - Summary of Notes Payable (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Secured-other | $ 1,061 | $ 1,069
Unsecured financing, net of unamortized deferred financing charges of $39 and $55 | 1,220 | 1,285
Notes payable due to affiliates, unsecured, net of $1.9 million and $2.0 million discount and unamortized deferred financing charges, respectively | 15,346 | 14,893
Total | 39,456 | 39,393
Construction Loans [Member] | Construction Revolvers [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, gross | 5,682 | 7,237
Development and Acquisition Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, gross | 10,719 | 9,533
Mezzanine Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, gross | 3,300 | 3,253
Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, gross | 2,128 | 2,123
Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, gross | $ 22,890 | $ 23,215

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