Supplemental Cash Flow Information - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Supplemental Cash Flow Elements [Abstract]
Repayment of loans related to life insurance policies	$ 13.9	$ 13.7

Net amount paid or received by the entity associated with issuance or collection of loans made to policy holders, principally secured by the benefits under the policy.

No definition available.

Name:	us-gaap_PaymentsForProceedsFromPolicyLoans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration