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Unsecured and Secured Indebtedness - Summary of Unsecured and Secured Indebtedness (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |
Net unamortized debt issuance costs | $ (18,542) |
Total Senior Notes | 2,913,217 | $ 3,149,188
Total Unsecured Term Loan | 398,399 | 397,934
Secured term loan | 199,843 | 199,251
Mortgage indebtedness | $ 982,509 | $ 1,183,164
Mortgage, Weighted Average Interest Rate | 4.90% | 5.20%
Unsecured Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | $ 2,932,200 | $ 3,172,200
Senior notes – discount, net | (5,000) | (5,900)
Net unamortized debt issuance costs | (14,000) | (17,100)
Total Senior Notes | $ 2,913,200 | $ 3,149,200
Debt Instrument Maturity Date, Start | 2017-04 |
Debt Instrument Maturity Date, End | 2026-02 |
Unsecured Senior Notes [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate | 3.375% | 3.375%
Unsecured Senior Notes [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate | 7.875% | 9.625%
Mortgage indebtedness-Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | $ 959,100 | $ 1,109,100
Mortgage, Weighted Average Interest Rate | 4.90% | 5.00%
Debt Instrument Maturity Date, Start | 2017-04 |
Debt Instrument Maturity Date, End | 2022-02 |
Mortgage indebtedness-Variable Rate [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | $ 26,200 | $ 78,000
Mortgage, Weighted Average Interest Rate | 1.80% | 1.80%
Debt Instrument Maturity Date | 2017-03 |
Mortgages indebtedness [Member] |  |
Debt Instrument [Line Items] |  |
Net unamortized debt issuance costs | $ (2,800) | $ (3,900)
Mortgage indebtedness | 982,500 | 1,183,200
Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | 400,000 | 400,000
Net unamortized debt issuance costs | (1,600) | (2,100)
Total Unsecured Term Loan | $ 398,400 | $ 397,900
Term Loan interest rates | 1.90% | 1.50%
Debt Instrument Maturity Date | 2017-04 |
Key Bank National Association [Member] | Term Loan [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | $ 200,000 | $ 200,000
Net unamortized debt issuance costs | (200) | (700)
Secured term loan | $ 199,800 | $ 199,300
Term Loan interest rates | 2.10% | 1.80%
Debt Instrument Maturity Date | 2017-04 |

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