Executive Benefit Agreement, Employee Savings Plans and Collective Bargaining Agreements - Additional Information (Detail)	1 Months Ended	12 Months Ended
	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%