Debt - Long-term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Capital leases	$ 4,337	$ 3,742
Total	699,337	3,742
Net unamortized discounts and issuance costs	(11,794)	0
Total long-term debt	687,543	3,742
Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	0	0
Term Loan Facility
Debt Instrument [Line Items]
Long-term debt, gross	395,000	0
Senior Notes \| 6.375% Senior Notes Due May 2026
Debt Instrument [Line Items]
Long-term debt, gross	$ 300,000	$ 0

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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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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