Long-Term Debt - Additional Information (Detail)			3 Months Ended			6 Months Ended
	Jan. 05, 2018 USD ($)	Jan. 03, 2017 USD ($)	Jun. 30, 2018 USD ($) Swap	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($) Swap	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	May 14, 2013
Debt Instrument [Line Items]
Long-term debt			$ 1,533,192,000			$ 1,533,192,000		$ 1,560,046,000
Outstanding letters of credit			$ 21,300,000			$ 21,300,000
Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Number of interest rate swaps held | Swap			5			5
Notional amount of interest rate swap			$ 1,000,000,000			$ 1,000,000,000
Maturity of interest rate swap						May 14, 2020
Weighted average fixed interest rate			2.45%			2.45%
Variable rate of interest			0.75%			0.75%
Variable rate of interest, description						variable rate of interest based upon the greater of 0.75% or the BBA LIBOR
Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Percentage of annual excess cash flow used to prepay outstanding loan						50.00%
Percentage of net proceeds from sale of non-ordinary assets			100.00%			100.00%
Percentage of net proceeds incurrence of debt						100.00%
Mandatory prepayments					$ 6,300,000
Cash paid for interest	$ 5,100,000	$ 12,900,000				$ 43,700,000	$ 48,500,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and discounts			$ 1,900,000			1,900,000		2,500,000
Long-term debt								15,000,000
Senior secured revolving			210,000,000			$ 210,000,000
Debt instrument, maturity date description						The Revolving Credit Facility will mature on the earlier of (a) March 31, 2022 and (b) the 91st day prior to the earlier of (1) the maturity of the Term B-2 Loans with an aggregate principal amount greater than $50.0 million and (2) the maturity date of any indebtedness incurred to refinance the Term B-2 Loans with an aggregate principal amount greater than $50.0 million.
Amount available for borrowing			188,700,000			$ 188,700,000
Restrictive Covenants [Member]
Debt Instrument [Line Items]
Restrictive covenants, restricted payments capacity available						$ 120,000,000
Maximum total net leverage ratio						575.00%
Restrictive Covenants [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Restrictive covenants, description						The Senior Secured Credit Facilities permit restricted payments in an aggregate amount per annum equal to the sum of (A) $25.0 million plus (B) an amount, if any, equal to (1) if the total net leverage ratio on a pro forma basis after giving effect to the payment of any such restricted payment, is no greater than 3.50 to 1.00, an unlimited amount, (2) if the total net leverage ratio on a pro forma basis after giving effect to the payment of any such restricted payment is no greater than 4.00 to 1.00 and greater than 3.50 to 1.00, the greater of (a) $95.0 million and (b) 7.50% of Market Capitalization (as defined in the Senior Secured Credit Facilities), (3) if the total net leverage ratio on a pro forma basis after giving effect to the payment of any such restricted payment is no greater than 4.50 to 1.00 and greater than 4.00 to 1.00, $95.0 million and (4) if the total net leverage ratio on a pro forma basis after giving effect to the payment of any such restricted payment is no greater than 5.00 to 1.00 and greater than 4.50 to 1.00, $65.0 million.
Percentage of Market Capitalization on restricted payment						7.50%
First lien secured net leverage ratio						350.00%
Total net leverage ratio, as calculated						435.00%
Restrictive Covenants [Member] | Senior Secured Credit Facilities [Member] | Maximum [Member]
Debt Instrument [Line Items]
Percentage of annual excess cash flow used to prepay outstanding loan						25.00%
Restricted payment on Senior Secured Credit Facilities, base payment						$ 25,000,000
Restricted payment on Senior Secured Credit Facilities, first payment						95,000,000
Restricted payment on Senior Secured Credit Facilities, second payment						95,000,000
Restricted payment on Senior Secured Credit Facilities, third payment						$ 65,000,000
Total net leverage ratio, one						400.00%
Total net leverage ratio, two						450.00%
Total net leverage ratio, three						500.00%
Restrictive Covenants [Member] | Senior Secured Credit Facilities [Member] | Minimum [Member]
Debt Instrument [Line Items]
Percentage of annual excess cash flow used to prepay outstanding loan						0.00%
Total net leverage ratio, one						350.00%
Total net leverage ratio, two						400.00%
Total net leverage ratio, three						450.00%
Term B-5 Loans [Member]
Debt Instrument [Line Items]
Debt instrument, balance					$ 998,300,000
Discount initially recorded							5,000,000
Debt issuance costs initially recorded				$ 40,000			40,000
Write-off of discounts and debt issuance costs							$ 8,000,000
Unamortized debt issuance costs and discounts			10,900,000			$ 10,900,000		11,900,000
Long-term debt			985,827,000			$ 985,827,000		990,819,000
Long-term debt, maturity date						Mar. 31, 2024
Percent of original principal amount on effective date used to calculate aggregate annual amount which will amortize in equal quarterly installments					1.00%
Term B-2 Loans [Member]
Debt Instrument [Line Items]
Repayment of outstanding principal					$ 753,600,000
Unamortized debt issuance costs and discounts			2,600,000			$ 2,600,000		3,300,000
Long-term debt			547,365,000			$ 547,365,000		$ 554,227,000
Long-term debt, maturity date						May 14, 2020
Percent of original principal amount on effective date used to calculate aggregate annual amount which will amortize in equal quarterly installments									1.00%
Cash paid for interest	$ 5,100,000
Term B-2 Loans [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Mandatory prepayments			0	$ 2,800,000
Term B-3 Loans [Member]
Debt Instrument [Line Items]
Repayment of outstanding principal					244,700,000
Term B-3 Loans [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Mandatory prepayments			$ 0
Term B-2 and Term B-3 Loans [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Mandatory prepayments					$ 3,500,000