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Employee Benefit Plans - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Deferred compensation agreements expenses $ 1,400,000 $ 1,400,000 $ 953,000
Deferred compensation plan, discretionary payments 0 0 0
Deferred compensation liability $ 21,611,000 22,666,000  
Employer contribution percentage to 401(k) plan 3.00%    
Employer contribution in profit-sharing plan $ 4,300,000 $ 4,100,000 $ 3,500,000
Increase in Employer Contribution Percentage to Profit Sharing Plan 2.00% 2.00% 2.00%
Executive Non-qualified Excess Plan [Member]      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Deferred compensation liability $ 21,600,000 $ 22,700,000