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Employee Savings Plans - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expenses related ESOP $ 17.3 $ 14.6 $ 13.9
Shares vested under ESOP 2,914,000    
Matching percentage of employer to employee contributions 100.00%    
Matching contributions to 401(k) retirement savings plan $ 31.9 26.4 $ 24.9
Temporary equity, shares issued (in shares) 108,219    
Deferred compensation $ 10.3 12.6  
Temporary equity, other changes 10.9    
Temporary equity, accretion to redemption value, adjustment $ 0.6    
Employee Stock Ownership Plan E S O P Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Maximum number of shares of common stock available for issuance 7,700,000    
Level 1 | Fair value, measurements, recurring | Non-qualified deferred compensation assets      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Assets, fair value disclosure $ 46.7 $ 39.8  
Share-based Compensation Award, Tranche One      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
ESOP vesting period 2 years    
Share-based Compensation Award, Tranche Two      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
ESOP vesting period 3 years