Unsecured Credit Agreements - Summary of Unsecured Credit Agreements (Parenthetical) (Detail) $ in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2023 USD ($)	Mar. 31, 2023 CAD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Long-term Debt		$ 1,944,323
Unsecured Debt
Debt Instrument [Line Items]
Long-term Debt		$ 1,848,080		$ 1,936,569
Unsecured Debt | 1 Month LIBOR
Debt Instrument [Line Items]
Interest rate		4.86%	4.86%	4.39%
Unsecured Debt | 1 Month LIBOR | 2026 Unsecured Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate	[1]	1.00%
Unsecured Debt | 1 Month Canadian Dollar
Debt Instrument [Line Items]
Long-term Debt			$ 100	$ 73,800
Interest rate		4.95%	4.95%	4.74%
Unsecured Debt | 1 Month Secured Overnight
Debt Instrument [Line Items]
Long-term Debt		$ 34,500		$ 123,500
Interest rate		4.80%	4.80%	4.36%

[1] At March 31, 2023 and December 31, 2022, one-month LIBOR was 4.86% and 4.39%, respectively.