Summary of Indebtedness and Lease Financing Obligations (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt and Capital Lease Obligations [Line Items]
Current obligations	$ 88,370	$ 90,275
Current deferred financing fees and debt discount	(4,811)	(7,541)
Current portion of long-term debt and financing lease obligation	83,559	82,734
Lease finance obligation	2,134,932	2,197,964
Noncurrent deferred financing fees and debt discount	(18,688)	(17,955)
Long-term debt and financing lease obligation, net of current portion	2,116,244	2,180,009
Total	2,199,803	2,262,743
Term Loan A
Debt and Capital Lease Obligations [Line Items]
Current obligations	19,550	49,500
Noncurrent obligations	366,562	866,250
Term Loan A-1 Facility
Debt and Capital Lease Obligations [Line Items]
Current obligations	62,500	40,000
Noncurrent obligations	1,171,875	730,000
Term Loan B3 Facility
Debt and Capital Lease Obligations [Line Items]
Current obligations	5,450
Noncurrent obligations	535,463
Lease Finance obligation
Debt and Capital Lease Obligations [Line Items]
Current obligations	870	775
Lease finance obligation	$ 61,032	57,902
Term Loan B
Debt and Capital Lease Obligations [Line Items]
Noncurrent obligations		$ 543,812

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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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