Long-Term Debt - Additional Information (Detail)				3 Months Ended
	May 07, 2019 USD ($)	Oct. 31, 2018	Jan. 05, 2018 USD ($)	Mar. 31, 2019 USD ($) Swap	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Long-term debt				$ 1,584,513,000		$ 1,553,389,000
Outstanding letters of credit				$ 21,300,000
Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Number of interest rate swaps held | Swap				5
Notional amount of interest rate swap				$ 1,000,000,000
Maturity of interest rate swap				May 14, 2020
Weighted average fixed interest rate				2.45%
Variable rate of interest				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]
Cash paid for interest			$ 5,100,000	$ 20,100,000	$ 24,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt				65,000,000		30,000,000
Senior secured revolving				210,000,000
Amount available for borrowing				$ 123,700,000
Revolving Credit Facility [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Net repayment of revolving credit facility	$ 40,000,000
Restrictive Covenants [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
First lien secured net leverage ratio		625.00%
Restrictive covenants, description		The Revolving Credit Facility requires that the Company comply with a springing maximum first lien secured leverage ratio of 6.25x to be tested as of the last day of any fiscal quarter, solely to the extent that on such date the aggregate amount of funded loans and letters of credit (excluding undrawn letters of credit in an amount not to exceed $30.0 million and cash collateralized letters of credit) under the Revolving Credit Facility exceeds an amount equal to 35% of the then outstanding commitments under the Revolving Credit Facility		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				351.00%
Restrictive covenants, restricted payments available				$ 185,000,000
Restrictive Covenants [Member] | Senior Secured Credit Facilities [Member] | Maximum [Member]
Debt Instrument [Line Items]
Excludable letters of credit under maximum required first lien secured leverage ratio				30,000,000
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 leverage ratio, one				400.00%
Total leverage ratio, two				450.00%
Total leverage ratio, three				500.00%
Restrictive Covenants [Member] | Senior Secured Credit Facilities [Member] | Minimum [Member]
Debt Instrument [Line Items]
Minimum percentage of funded loan and letters of credit for covenant to apply				35.00%
Total leverage ratio, one				350.00%
Total leverage ratio, two				400.00%
Total leverage ratio, three				450.00%
Term B-5 Loans [Member]
Debt Instrument [Line Items]
Long-term debt				$ 1,519,513,000		$ 1,523,389,000
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				1.015%