Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt	$ 1,533,192	$ 1,560,046
Less discounts	(7,780)	(8,685)
Less debt issuance costs	(7,639)	(9,045)
Less current maturities	(23,707)	(38,707)
Total long-term debt, net	1,494,066	1,503,609
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt		15,000
Term B-5 Loans [Member]
Debt Instrument [Line Items]
Long-term debt	985,827	990,819
Term B-2 Loans [Member]
Debt Instrument [Line Items]
Long-term debt	$ 547,365	$ 554,227

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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