Unsecured Credit Agreements - Summary of Unsecured Credit Agreements (Detail) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Debt instrument, interest rate		6.00%	5.00%
Total unsecured debt		$ 1,856,377	$ 1,699,160
Long-term Debt		1,856,377
Unsecured Debt
Debt Instrument [Line Items]
Long-term Debt		1,751,933	1,592,472
Unsecured Debt | Term Loan [Member]
Debt Instrument [Line Items]
Total unsecured debt		590,000	650,000
Debt issuance costs, net		2,902	3,329
Long-term Debt		587,098	646,671
Unsecured Debt | Senior Notes [Member]
Debt Instrument [Line Items]
Total unsecured debt		850,000	850,000
Unamortized debt issuance costs and original issuance discount, net			(6,199)
Long-term Debt		$ 844,178	843,801
Unsecured Debt | Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Interest Rate	[1],[2],[3]	Applicable reference rate + 0.85% (a) (b) (c)
Maturity Date		2026-03
Basis spread on variable rate	[1],[2],[3]	0.85%
Total unsecured debt		$ 320,657	102,000
Unsecured Debt | Senior Notes
Debt Instrument [Line Items]
Unamortized debt issuance costs and original issuance discount, net		$ 5,822
Unsecured Debt | 2022 Unsecured Term Loan
Debt Instrument [Line Items]
Interest Rate	[1]	one-month LIBOR + 1.00% (c)
Maturity Date	[4]	2022-02
Total unsecured debt			60,000
Unsecured Debt | 2022 Unsecured Term Loan | 1 Month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	[1]	1.00%
Unsecured Debt | 2024 Unsecured Term Loan
Debt Instrument [Line Items]
Interest Rate	[1]	one-month LIBOR + 1.00% (c)
Maturity Date		2024-06
Total unsecured debt		$ 190,000	190,000
Unsecured Debt | 2024 Unsecured Term Loan | 1 Month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	[1]	1.00%
Unsecured Debt | 2026 Unsecured Term Loan
Debt Instrument [Line Items]
Interest Rate	[1]	one-month LIBOR + 1.00% (c)
Maturity Date		2026-02
Total unsecured debt		$ 400,000	400,000
Unsecured Debt | 2026 Unsecured Term Loan | 1 Month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	[1]	1.00%
Unsecured Debt | 2027 Senior Unsecured Notes | Senior Guaranteed Notes Series A
Debt Instrument [Line Items]
Debt instrument, interest rate		4.84%
Maturity Date		2027-04
Total unsecured debt		$ 150,000	150,000
Unsecured Debt | 2028 Senior Unsecured Notes | Senior Guaranteed Notes Series B
Debt Instrument [Line Items]
Debt instrument, interest rate		5.09%
Maturity Date		2028-07
Total unsecured debt		$ 225,000	225,000
Unsecured Debt | 2030 Senior Unsecured Notes | Senior Guaranteed Notes Series C
Debt Instrument [Line Items]
Debt instrument, interest rate		5.19%
Maturity Date		2030-07
Total unsecured debt		$ 100,000	100,000
Unsecured Debt | 2031 Senior Unsecured Public Notes | Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate		2.60%
Maturity Date		2031-09
Total unsecured debt		$ 375,000	$ 375,000

[1] At June 30, 2022 and December 31, 2021, one-month LIBOR was 1.79% and 0.10%, respectively.

[2] At June 30, 2022, a balance of $243.0 million was subject to the one-month Secured Overnight Financing Rate of 1.69%. The remaining balance includes $100 million CAD borrowings remeasured to $77.7 million USD, which was subject to the one-month Canadian Dollar Offered Rate of 2.23%.

[3] At December 31, 2021, interest rate was one-month LIBOR plus 1.00%

[4] The 2022 Unsecured Term Loan was paid in full in February 2022, with borrowings from the unsecured revolving credit facility.