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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Long-term Debt - Additional Information (Detail) - USD ($)				12 Months Ended
	Jun. 19, 2018	Apr. 30, 2017	Apr. 13, 2017	Dec. 31, 2018	Dec. 31, 2017	Nov. 30, 2017
Debt Instrument [Line Items]
Loan amount available under agreement				$ 71,700,000
Assets relating to master loan agreements, Gross				58,700,000	$ 63,400,000
Capital leased assets, net book value				$ 9,500,000	13,000,000
Master Loan Agreements [Member]
Debt Instrument [Line Items]
Payment Period, typical				60 months
Assets relating to master loan agreements, Gross				$ 98,700,000	74,500,000
Capital leased assets, net book value				$ 58,200,000	$ 51,400,000
Term Loan Agreement [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Margin interest rate percentage			2.50%
Term Loan Agreement [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Margin interest rate percentage			1.50%
Term Loan Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 300,000,000
Term loan facility maturity period		7 years
ABL Credit Agreement [Member] \| Eurodollar Rate Loan One [Member]
Debt Instrument [Line Items]
Margin interest rate percentage			1.25%
ABL Credit Agreement [Member] \| Eurodollar Rate Loan Two [Member]
Debt Instrument [Line Items]
Margin interest rate percentage			1.50%
ABL Credit Agreement [Member] \| Eurodollar Rate Loan Three [Member]
Debt Instrument [Line Items]
Margin interest rate percentage			1.75%
ABL Credit Agreement [Member] \| Base Rate Loan One [Member]
Debt Instrument [Line Items]
Margin interest rate percentage			0.25%
ABL Credit Agreement [Member] \| Base Rate Loan Two [Member]
Debt Instrument [Line Items]
Margin interest rate percentage			0.50%
ABL Credit Agreement [Member] \| Base Rate Loan Three [Member]
Debt Instrument [Line Items]
Margin interest rate percentage			0.75%
ABL Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity		$ 100,000,000	$ 100,000,000
ABL Credit Agreement [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity		$ 50,000,000
Amended Term Loan Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount						$ 297,800,000
Term Loan Second Amendment [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 397,800,000
Debt instrument, extended maturity date range, start	Apr. 15, 2024
Debt instrument, extended maturity date range, end	Apr. 15, 2025
ABL Third Amendment [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity	$ 150,000,000
Debt instrument, extended maturity date range, start	Apr. 13, 2022
Debt instrument, extended maturity date range, end	Jun. 19, 2023