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Debt - Summary of Debt (Parenthetical) (Detail) - USD ($) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 24, 2017 | Nov. 23, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Apr. 03, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 50.00% |  |  |  |  |
Senior Notes Due 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings |  |  | $ 250,000,000 |  |  |
Interest rate |  |  | 10.25% |  |  |
Senior Secured Term Loan B [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings |  |  | $ 545,000,000 |  |  |
Interest rate |  |  | 1.56% |  |  |
Applicable margin |  |  | 3.75% |  |  |
LIBOR Period |  |  | 1 month |  |  |
Debt maturity date |  |  | Oct. 19, 2022 |  |  |
Senior Secured Term Loan B [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Applicable margin | 3.75% | 4.25% |  |  |  |
Senior Secured Term Loan B [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  |  | 0.75% |  |  |
Senior Secured Term Loan B [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  |  |  |  |  | 0.75%
Incremental Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings |  |  | $ 300,000,000 |  | $ 300,000,000 |
Interest rate |  |  | 1.56% |  |  |
Applicable margin |  |  | 3.25% |  |  |
LIBOR Period |  |  | 1 month |  |  |
Debt maturity date |  |  | Apr. 03, 2021 |  |  |
Incremental Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Applicable margin | 3.25% | 3.75% |  |  |  |
Senior Secured Revolving Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt maturity date |  |  | Oct. 19, 2020 |  |  |
Borrowings |  |  | $ 143,000,000 | $ 143,000,000 |  |
Senior Secured Revolving Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  |  | 1.56% |  |  |
Applicable margin |  |  | 3.50% |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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