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Accounts Receivable - Components of Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Gross accounts receivable $ 671,471us-gaap_AccountsReceivableGrossCurrent $ 177,370us-gaap_AccountsReceivableGrossCurrent
Accounts receivable reserves (1,069)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (453)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net $ 670,402us-gaap_AccountsReceivableNetCurrent $ 176,917us-gaap_AccountsReceivableNetCurrent