Aggregate Principal Amounts Due on Mortgage Notes Payable by Unconsolidated LLCs, Accounted Under Equity Method (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
Schedule Of Equity Method Investments [Line Items]
Mortgage Loan Balance		$ 28,763	$ 28,895
Equity Method Investments
Schedule Of Equity Method Investments [Line Items]
Mortgage Loan Balance	[1]	28,763	28,895
Equity Method Investments | FTX MOB Phase II
Schedule Of Equity Method Investments [Line Items]
Mortgage Loan Balance	[1]	$ 5,396	5,427
Maturity Date		2017-08
Equity Method Investments | Grayson Properties
Schedule Of Equity Method Investments [Line Items]
Mortgage Loan Balance	[1]	$ 14,612	14,670
Maturity Date		2021-09
Equity Method Investments | Brunswick Associates
Schedule Of Equity Method Investments [Line Items]
Mortgage Loan Balance	[1]	$ 8,755	$ 8,798
Maturity Date		2024-12

[1] All mortgage loans, other than construction loans, require monthly principal payments through maturity and include a balloon principal payment upon maturity.