Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt	$ 1,527,266	$ 1,560,046
Less discounts	(7,331)	(8,685)
Less debt issuance costs	(6,939)	(9,045)
Less current maturities	(23,707)	(38,707)
Total long-term debt, net	1,489,289	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	983,331	990,819
Term B-2 Loans [Member]
Debt Instrument [Line Items]
Long-term debt	$ 543,935	$ 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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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