Aggregate Principal Amounts Due on Mortgage Notes Payable by Unconsolidated LLCs, Accounted Under Equity Method (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Schedule Of Equity Method Investments [Line Items]
2017		$ 61,115
2018		23,043
2019	[1]	205,251
2020		1,292
2021		1,356
2022 and thereafter		23,605
Total		315,662
Mortgage Loan Balance		28,367	$ 28,895
Equity Method Investments
Schedule Of Equity Method Investments [Line Items]
2017		5,727
2018		445
2019		466
2020		484
2021		13,582
2022 and thereafter		7,663
Total		28,367
Mortgage Loan Balance	[2]	28,367	28,895
Equity Method Investments | FTX MOB Phase II
Schedule Of Equity Method Investments [Line Items]
Mortgage Loan Balance	[2]	$ 5,301	5,427
Maturity Date	[3]	2017-08
Equity Method Investments | Grayson Properties
Schedule Of Equity Method Investments [Line Items]
Mortgage Loan Balance	[2]	$ 14,438	14,670
Maturity Date		2021-09
Equity Method Investments | Brunswick Associates
Schedule Of Equity Method Investments [Line Items]
Mortgage Loan Balance	[2]	$ 8,628	$ 8,798
Maturity Date		2024-12

[1] Includes repayment of $201.5 million of outstanding borrowings under the terms of our $250 million revolving credit agreement.

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

[3] 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.