Investments in Unconsolidated Real Estate Entities - Additional Information (Detail) $ in Thousands	6 Months Ended
Jun. 30, 2016 USD ($) Property	Dec. 31, 2015 USD ($)
Real Estate Properties [Line Items]
Number of real estate properties \| Property	61
Investments in and advances to unconsolidated real estate entities	$ 3,695	$ 3,856
Investments in unconsolidated real estate entities	15,891	15,873
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 effective interest rate	3.57%
Mortgage notes payable maturity date	2019
5.63% Mortgage Notes Payable [Member]
Real Estate Properties [Line Items]
Mortgage notes payable	$ 85,724
Mortgage notes payable bearing interest rate	5.63%
Mortgage notes payable effective interest rate	5.76%
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 effective interest rate	5.85%
Automatic extension period (in years)	1 year
Mortgage notes payable maturity date	2018
Unconsolidated Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties \| Property	4
Investments in unconsolidated real estate entities	$ 15,891	15,873
Mortgage notes payable	$ 177,556	$ 177,503
Washington, D.C. [Member] \| Unconsolidated Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties \| Property	1
Atlanta, Georgia [Member] \| Unconsolidated Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties \| Property	3
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%

Mortgage loans on real estate effective interest rate.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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The aggregate amount of liabilities as of the balance sheet date for obligations incurred in connection with the entity's investments.

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-Name Accounting Standards Codification
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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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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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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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