Summary of Indebtedness and Lease Financing Obligations (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt and Capital Lease Obligations [Line Items]
Current obligations	$ 88,458	$ 88,370
Current deferred financing fees and debt discount	(4,749)	(4,811)
Current portion of long-term debt and financing lease obligation	83,709	83,559
Lease finance obligation	2,090,680	2,134,932
Noncurrent deferred financing fees and debt discount	(16,328)	(18,688)
Long-term debt and financing lease obligation, net of current portion	2,074,352	2,116,244
Total	2,158,061	2,199,803
Term Loan A
Debt and Capital Lease Obligations [Line Items]
Current obligations	19,550	19,550
Noncurrent obligations	356,787	366,562
Term Loan A-1 Facility
Debt and Capital Lease Obligations [Line Items]
Current obligations	62,500	62,500
Noncurrent obligations	1,140,625	1,171,875
Term Loan B3 Facility
Debt and Capital Lease Obligations [Line Items]
Current obligations	5,450	5,450
Noncurrent obligations	532,738	535,463
Lease Finance obligation
Debt and Capital Lease Obligations [Line Items]
Current obligations	958	870
Lease finance obligation	$ 60,530	$ 61,032

Debt and Capital Lease Obligations [Line Items]

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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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 and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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