Aggregate Principal Amounts Due on Mortgage Notes Payable by Unconsolidated LLCs, Accounted Under Equity Method (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items]
Mortgage Loan Balance		$ 28,222	$ 28,367
Equity Method Investments
Schedule Of Equity Method Investments [Line Items]
Mortgage Loan Balance	[1]	28,222	28,367
Equity Method Investments | FTX MOB Phase II
Schedule Of Equity Method Investments [Line Items]
Mortgage Loan Balance	[1]	$ 5,267	5,301
Maturity Date	[2]	2017-08
Equity Method Investments | Grayson Properties
Schedule Of Equity Method Investments [Line Items]
Mortgage Loan Balance	[1]	$ 14,375	14,438
Maturity Date		2021-09
Equity Method Investments | Brunswick Associates
Schedule Of Equity Method Investments [Line Items]
Mortgage Loan Balance	[1]	$ 8,580	$ 8,628
Maturity Date		2024-12

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

[2] This loan is scheduled to mature within the next twelve months, at which time it will be refinanced pursuant to: (i) a new third-party mortgage loan; (ii) a member loan extended from us to the LLC, or; (iii) equity contributions to the LLC by us and the third-party member. Funds required from us to the LLC for either the member loan or our share of an equity contribution would likely be borrowed under our Credit Agreement.