Unsecured Credit Agreements - Summary of Debt Issuance Cost Amortization (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Disclosure [Abstract]
Debt issuance costs amortization	$ 900	$ 956	$ 1,756	$ 1,870

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Period Type:	duration