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Significant Components of Prepaid Expenses and Other Current Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]    
Prepaid expenses $ 34,716us-gaap_PrepaidExpenseCurrent $ 35,334us-gaap_PrepaidExpenseCurrent
Supplies inventory 12,964us-gaap_Supplies 14,340us-gaap_Supplies
Other 52,440us-gaap_OtherAssetsCurrent 49,300us-gaap_OtherAssetsCurrent
Total $ 100,120us-gaap_PrepaidExpenseAndOtherAssetsCurrent $ 98,974us-gaap_PrepaidExpenseAndOtherAssetsCurrent