Investments in Unconsolidated Real Estate Entities - Additional Information (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($) Property	Dec. 31, 2014 USD ($)
Real Estate Properties [Line Items]
Number of real estate properties \| Property	61
Investments in and advances to unconsolidated real estate entities	$ 3,856	$ 4,059
Investments in unconsolidated real estate entities	15,873	16,624
3.50% Mortgage Note Payable [Member]
Real Estate Properties [Line Items]
Mortgage notes payable	$ 51,000
Mortgage notes payable bearing interest rate	3.50%
Mortgage notes payable maturity date	2019
5.63% Mortgage Notes Payable [Member]
Real Estate Properties [Line Items]
Mortgage notes payable	$ 85,723
Mortgage notes payable bearing interest rate	5.63%
Mortgage notes payable maturity date	2017
5.71% Mortgage Notes Payable [Member]
Real Estate Properties [Line Items]
Mortgage notes payable	$ 41,000
Mortgage notes payable bearing interest rate	5.71%
Mortgage notes payable maturity date	2018
Automatic extension period (in years)	1 year
Unconsolidated Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties \| Property	4
Investment over equity underlying net assets	$ 2,554
Investments in unconsolidated real estate entities	15,873	16,624
Mortgage notes payable	$ 177,723	$ 177,723
Apartment LLC [Member] \| Minimum [Member] \| Unconsolidated Properties [Member]
Real Estate Properties [Line Items]
Equity method investment, ownership percentage	25.00%
Apartment LLC [Member] \| Maximum [Member] \| Unconsolidated Properties [Member]
Real Estate Properties [Line Items]
Equity method investment, ownership percentage	35.00%
Atlanta, Georgia [Member] \| Unconsolidated Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties \| Property	3
Washington, D.C. [Member] \| Unconsolidated Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties \| Property	1

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-Publisher FASB
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The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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The number of real estate properties owned as of the balance sheet date.

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