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Employee Benefit Plans - Additional Information (Detail) - USD ($) | 12 Months Ended
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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 |

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