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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