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Unsecured and Secured Indebtedness - Summary of Unsecured and Secured Indebtedness (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |
Net unamortized debt issuance costs | $ (23,835) |
Total Senior Notes | 3,149,188 | $ 2,752,394
Total Unsecured Term Loan | 397,934 | 347,883
Secured term loan | 199,251 | 398,451
Mortgage indebtedness | $ 1,183,164 | $ 1,684,487
Mortgage, Weighted Average Interest Rate | 5.20% | 5.30%
Unsecured Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | $ 3,172,200 | $ 2,425,200
Senior notes – (discount) premium, net | (5,900) | 700
Net unamortized debt issuance costs | (17,100) | (13,500)
Total Senior Notes | $ 3,149,200 | $ 2,752,400
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 3.375% | 3.375%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum | 9.625% | 9.625%
Debt instrument Maturity Date, Start | 2016-03 |
Debt instrument Maturity Date, End | 2026-02 |
Unsecured Senior Notes [Member] | Senior Convertible Notes due 2040 [Member] |  |
Debt Instrument [Line Items] |  |
Senior convertible notes due 2040, net | $ 0 | $ 340,000
Debt Instrument, Stated Percentage |  | 1.75%
Mortgage indebtedness-Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | $ 1,109,100 | $ 1,590,600
Mortgage, Weighted Average Interest Rate | 5.00% | 5.40%
Debt instrument Maturity Date, Start | 2016-09 |
Debt instrument Maturity Date, End | 2022-02 |
Mortgage indebtedness-Variable Rate [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | $ 78,000 | $ 99,200
Mortgage, Weighted Average Interest Rate | 1.80% | 1.40%
Debt instrument Maturity Date, Start | 2016-03 |
Debt instrument Maturity Date, End | 2016-12 |
Mortgages indebtedness [Member] |  |
Debt Instrument [Line Items] |  |
Net unamortized debt issuance costs | $ (3,900) | $ (5,400)
Mortgage indebtedness | 1,183,200 | 1,684,400
Term Loan [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Net unamortized debt issuance costs | (2,100) | (2,100)
Total Unsecured Term Loan | 397,900 | 347,900
Wells Fargo Bank National Association and PNC Bank National Association [Member] | 2015 Term Loan [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | $ 400,000 | 0
Term Loan interest rates | 1.50% |
Term Loan Maturity Date | 2017-04 |
Wells Fargo Bank National Association and PNC Bank National Association [Member] | 2014 Term Loan [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | $ 0 | $ 350,000
Term Loan interest rates |  | 3.10%
Key Bank National Association [Member] | Term Loan [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Carrying Amount | 200,000 | $ 400,000
Net unamortized debt issuance costs | (700) | (1,500)
Secured term loan | $ 199,300 | $ 398,500
Term Loan interest rates | 1.80% | 1.60%
Term Loan Maturity Date | 2017-04 |

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