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Executive Benefit Agreement, Employee Savings Plans and Collective Bargaining Agreements - Additional Information (Detail)	1 Months Ended	12 Months Ended
	Jan. 31, 2019	Dec. 31, 2018 USD ($) Person
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
Number of persons employed		576
Union agreement earliest expiration date		2019-07
Union agreement latest expiration date		2021-07
Collective Bargaining Agreements [Member]
Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items]
Number of persons employed		193
Subsequent Event [Member]
Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items]
401(k) plan, Employer matching contribution percentage	50.00%
Subsequent Event [Member] | 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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Minimum amount of life insurance policies to be kept by the company.

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