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Executive Benefit Agreement, Employee Savings Plans and Collective Bargaining Agreements - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
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Jan. 31, 2019 | Dec. 31, 2020 USD ($) Person | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items] |  |  |  |
Minimum amount of life insurance policies to be kept by the company for 2005 Agreement | $ |  | $ 2,500,000 |  |
401(k) plan, Employer matching contribution percentage | 50.00% |  |  |
Defined contribution plan, employer discretionary contribution amount | $ |  | $ 1,022,000 | $ 997,000 | $ 243,000
Number of persons employed | Person |  | 573 |  |
Union agreement earliest expiration date |  | 2021-07 |  |
Union agreement latest expiration date |  | 2022-11 |  |
Collective Bargaining Agreements [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items] |  |  |  |
Number of persons employed | Person |  | 188 |  |
Maximum [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items] |  |  |  |
401(k) plan, Company matching contributions to all full-time employees | 6.00% |  |  |

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