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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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Weighted average interest rate of debt outstanding.

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