Debt and Capital Lease Obligations - Summary of Outstanding Debt and Capital Lease Obligation (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Weighted average interest rate	2.12%	2.11%
Interest rate	5.375%	5.375%
Capital lease obligations	$ 21,396	$ 21,980
Less current portion	(21,194)	(21,158)
Long-term debt and capital lease obligations	1,533,447	1,495,822
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term debt	500,000	500,000
Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ 1,033,245	$ 995,000

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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-SubTopic 30

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Contractual interest rate for funds borrowed, under the debt agreement.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-SubTopic 210

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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