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Retirement Plans - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Employee service period under ESOP 1 year    
Deferred compensation obligations $ 5,200 $ 5,700  
Cash values of the insurance policies purchased to fund deferred compensation obligations 136,892 133,742 $ 117,857
Funded status of the supplemental retirement plans (13,527) (13,901)  
AOCI, defined benefit plan, after tax (9,528) (9,792)  
Amortization of actuarial losses $ 500    
401(k) Plan      
Defined Benefit Plan Disclosure [Line Items]      
Minimum age for employees 21 years    
Minimum period for employees to participate 90 days    
Discretionary matching contribution equal to percentage of participant's contribution 50.00%    
Discretionary matching contribution maximum percentage of eligible compensation 4.00%    
Supplemental Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Cash values of the insurance policies purchased to fund deferred compensation obligations $ 136,900 133,700  
Funded status of the supplemental retirement plans 13,500 13,900  
AOCI, defined benefit plan, after tax 9,500 9,800  
Deferred tax liability $ (4,000) $ (4,100)