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Debt - Summary of Notes Payable (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Secured-other	$ 909	$ 1,069
Unsecured financing, net of unamortized deferred financing charges of $0 and $55	595	1,285
Notes payable, unsecured, net of $0.8 and $2.0 million discount and unamortized deferred financing charges, respectively	4,903	14,893
Total	18,930	39,393
Construction Loans [Member] | Construction Revolvers [Member]
Debt Instrument [Line Items]
Debt instrument, gross	2,220	7,237
Development and Acquisition Notes [Member]
Debt Instrument [Line Items]
Debt instrument, gross	10,290	9,533
Mezzanine Notes [Member]
Debt Instrument [Line Items]
Debt instrument, gross	0	3,253
Line of Credit [Member]
Debt Instrument [Line Items]
Debt instrument, gross	13	2,123
Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, gross	$ 13,432	$ 23,215

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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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