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Long-term Debt - Additional Information (Detail) - USD ($)			12 Months Ended
	Nov. 30, 2017	Apr. 13, 2017	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Assets relating to master loan agreements, Gross			$ 63,400,000	$ 64,200,000
Capital leased assets, net book value			$ 13,000,000	16,400,000
Master Loan Agreements [Member]
Debt Instrument [Line Items]
Payment Period, typical			60 months
Assets relating to master loan agreements, Gross			$ 74,500,000	48,700,000
Capital leased assets, net book value			51,400,000	$ 38,000,000
US Bank Master Loan Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 100,000,000
Term loan facility maturity period	60 months
Loan amount available under agreement			100,000,000
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
Quarterly principal payment of term loan			$ 800,000
Credit facility, amortization description			The Term Loan amortizes in quarterly principal payments of approximately $0.8 million, with any remaining unpaid balances due on April 15, 2024, which is the maturity date. Loans incurred under the ABL Revolver will have a final maturity of April 13, 2022.
Percentage of mandatory pre-payments on debt issuance			100.00%
Percentage of mandatory pre-payments on sale or disposition of assets			100.00%
Percentage of mandatory pre-payments on excess cash flow			50.00%
Excess cash flow limit for mandatory pre-payments of debt			$ 5,000,000
Term Loan Agreement [Member] | Term Loan [Member] | Leverage Ratio Range One [Member]
Debt Instrument [Line Items]
Percentage of mandatory pre-payments on excess cash flow			25.00%
Term Loan Agreement [Member] | Term Loan [Member] | Leverage Ratio Range Two [Member]
Debt Instrument [Line Items]
Percentage of mandatory pre-payments on excess cash flow			0.00%
ABL Credit Agreement [Member]
Debt Instrument [Line Items]
Fixed coverage ratio, covenants requirements		1.00%
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
Maturity date			Apr. 13, 2022
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	$ 299,300,000

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Excess cash flow limit for mandatory pre-payments of debt.

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Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Date the credit facility terminates, in CCYY-MM-DD format.

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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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Amount of the required periodic payments of both interest and principal.

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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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