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Indebtedness - Summary of Indebtedness at Estimated Fair Value (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Disclosure [Line Items] |  |  |
Total, Carrying Amount | [1] | $ 1,319,521 | $ 1,442,411
Total, Fair Value |  | 1,373,086 | 1,495,687
Mortgages |  |  |
Debt Disclosure [Line Items] |  |  |
Total, Carrying Amount | [1] | 506,223 | 564,955
Mortgage Loans Payable, Net, Fair Value |  | 536,323 | 595,964
Senior Unsecured Notes |  |  |
Debt Disclosure [Line Items] |  |  |
Total, Carrying Amount | [1] | 205,298 | 364,956
Senior Unsecured Debt, Net, Fair Value |  | 230,282 | 386,253
Unsecured Term Loan |  |  |
Debt Disclosure [Line Items] |  |  |
Total, Carrying Amount | [1] | 460,000 | 460,000
Unsecured Term Loan, Fair Value |  | 458,481 | 460,970
Unsecured Credit Facility |  |  |
Debt Disclosure [Line Items] |  |  |
Total, Carrying Amount | [1] | 148,000 | 52,500
Unsecured Credit Facility, Fair Value |  | $ 148,000 | $ 52,500
[1] | The carrying amounts include unamortized premiums and discounts and exclude unamortized deferred financing costs.

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