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Defined Benefit Plan - Summary of Allocation of Assets in Swiss Life's Group Life Portfolio (Detail) - Pension Plan
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]  
Allocation of pension plan assets 100.00%
Certificates Of Deposit And Cash And Cash Equivalents [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Allocation of pension plan assets 2.00%
Fixed Income Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Allocation of pension plan assets 63.00%
Hedge Funds, Equity [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Allocation of pension plan assets 13.00%
Real Estate [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Allocation of pension plan assets 20.00%
Equity Method Investments [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Allocation of pension plan assets 2.00%