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Capital Lease Obligations (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Capital Lease Obligations [Line Items]
Capital lease obligations	$ 14,101us-gaap_CapitalLeaseObligations	$ 30,162us-gaap_CapitalLeaseObligations
Less current portion	7,127us-gaap_CapitalLeaseObligationsCurrent	22,662us-gaap_CapitalLeaseObligationsCurrent
Noncurrent portion of capital leases	$ 6,974	$ 7,500

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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