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Schedule of Future Minimum Obligations Under Lease Commitments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Commitments and Contingencies Disclosure [Line Items]  
Future minimum capital lease obligations - 2015 $ 294us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
Future minimum capital lease obligations - 2016 294us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
Future minimum capital lease obligations - 2017 294us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
Future minimum capital lease obligations - 2018 294us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
Future minimum capital lease obligations - 2019 294us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears
Future minimum capital lease obligations - Thereafter 25us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter
Total future minimum capital lease obligations 1,495us-gaap_CapitalLeasesFutureMinimumPaymentsDue [1]
Future minimum operating lease obligations - 2015 113,756us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
Future minimum operating lease obligations - 2016 93,917us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
Future minimum operating lease obligations - 2017 73,299us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
Future minimum operating lease obligations - 2018 54,503us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
Future minimum operating lease obligations - 2019 40,179us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Future minimum operating lease obligations - Thereafter 143,856us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total future minimum operating lease obligations $ 519,510us-gaap_OperatingLeasesFutureMinimumPaymentsDue
[1] Includes $0.3 million of imputed interest.