Unsecured and Secured Indebtedness - Summary of Unsecured and Secured Indebtedness (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Net unamortized debt issuance costs	$ (7,819)
Total Senior Notes	1,449,613	$ 1,647,963
Total Term Loan	99,635	99,460
Mortgage indebtedness	249,260	94,874
Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Carrying Amount	1,460,000	1,660,000
Senior notes – discount, net	(4,000)	(3,800)
Net unamortized debt issuance costs	(6,400)	(8,200)
Total Senior Notes	$ 1,449,600	$ 1,648,000
Debt Instrument Maturity Date, Start	2023-05
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	4.70%	4.70%
Mortgage indebtedness-Variable Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Carrying Amount	$ 96,500	$ 0
Weighted average discount rate percent	2.30%
Debt Instrument Maturity Date, End	2021-01
Mortgage indebtedness-Fixed Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Carrying Amount	$ 153,800	$ 95,200
Weighted average discount rate percent	4.40%	5.70%
Debt Instrument Maturity Date, Start	2021-06
Debt Instrument Maturity Date, End	2025-05
Mortgages indebtedness [Member]
Debt Instrument [Line Items]
Net unamortized debt issuance costs	$ (1,000)	$ (300)
Mortgage indebtedness	249,300	94,900
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	100,000	100,000
Net unamortized debt issuance costs	(400)	(500)
Total Term Loan	$ 99,600	$ 99,500
Term Loan interest rates	1.10%	2.80%
Debt Instrument Maturity Date	2023-01

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Unsecured term loan.

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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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