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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]    
Other co-venturers $ 16,291us-gaap_OilAndGasJointInterestBillingReceivablesCurrent $ 13,904us-gaap_OilAndGasJointInterestBillingReceivablesCurrent
Trade 60,263us-gaap_AccountsAndOtherReceivablesNetCurrent 134,622us-gaap_AccountsAndOtherReceivablesNetCurrent
Unbilled accounts receivable 33,052us-gaap_UnbilledContractsReceivable 22,001us-gaap_UnbilledContractsReceivable
Other 10,753us-gaap_OtherReceivablesNetCurrent 1,444us-gaap_OtherReceivablesNetCurrent
Total accounts receivable $ 120,359us-gaap_AccountsReceivableNetCurrent $ 171,971us-gaap_AccountsReceivableNetCurrent