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Unsecured and Secured Indebtedness - Summary of Unsecured and Secured Indebtedness (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Net unamortized debt issuance costs | $ (21,168) |
Total Senior Notes | 2,810,100 | $ 2,913,217
Total Unsecured Term Loan | 398,130 | 398,399
Mortgage indebtedness | 641,082 | 982,509
Total Secured Term Loan | $ 0 | $ 199,843
Mortgage, Weighted Average Interest Rate | 4.20% | 4.90%
Unsecured Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | $ 2,832,200 | $ 2,932,200
Senior notes – discount, net | (5,100) | (5,000)
Net unamortized debt issuance costs | (17,000) | (14,000)
Total Senior Notes | $ 2,810,100 | $ 2,913,200
Debt Instrument Maturity Date, Start | 2018-07 |
Debt Instrument Maturity Date, End | 2027-06 |
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 | 7.50% | 7.875%
Mortgage indebtedness-Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | $ 643,400 | $ 959,100
Mortgage, Weighted Average Interest Rate | 4.70% | 4.90%
Debt Instrument Maturity Date, Start | 2019-01 |
Debt Instrument Maturity Date, End | 2022-01 |
Mortgage indebtedness-Variable Rate [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | $ 0 | $ 26,200
Mortgage, Weighted Average Interest Rate |  | 1.80%
Mortgages indebtedness [Member] |  |
Debt Instrument [Line Items] |  |
Net unamortized debt issuance costs | (2,300) | $ (2,800)
Mortgage indebtedness | 641,100 | 982,500
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 | (1,900) | (1,600)
Total Unsecured Term Loan | $ 398,100 | $ 398,400
Term Loan interest rates | 2.90% | 1.90%
Debt Instrument Maturity Date, Start | 2018-04 |
Debt Instrument Maturity Date, End | 2023-01 |
Key Bank National Association [Member] | Term Loan [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | $ 0 | $ 200,000
Net unamortized debt issuance costs | 0 | (200)
Total Secured Term Loan | $ 0 | $ 199,800
Term Loan interest rates |  | 2.10%

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