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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

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_PaymentsForProceedsFromPolicyLoans
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration