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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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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