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Schedule of Future Minimum Lease Payments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Leases Future Minimum Payments [Line Items]  
2015 $ 83,427us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 79,538us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 73,412us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 53,733us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter $ 0us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter