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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 |  |  |  |  |

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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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- Definition The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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