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

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of collateralized debt obligations classified as other.

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