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Derivative Financial Instruments - Schedule of Notional Amounts and Estimated Fair Values of Commodity Derivative Positions (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 bbl | Dec. 31, 2013 bbl
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Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | 281,000 | 356,000
Oil/Natural Gas Derivative Liabilities, Notional Amount | 1,130,000 | 1,574,000
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 188 | $ 1,004
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | (6,523) | (2,704)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | 8,540,000 | 14,240,000
Oil/Natural Gas Derivative Liabilities, Notional Amount | 27,630,000 | 22,510,000
Oil/Natural Gas Derivative Assets, Estimated Fair Value | 2,126 | 2,903
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | (4,527) | (3,212)
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | 1,130,000 | 1,574,000
Oil/Natural Gas Derivative Liabilities, Notional Amount | 281,000 | 356,000
Oil/Natural Gas Derivative Assets, Estimated Fair Value | 6,608 | 2,818
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | (188) | (991)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | 27,630,000 | 22,850,000
Oil/Natural Gas Derivative Liabilities, Notional Amount | 8,540,000 | 13,900,000
Oil/Natural Gas Derivative Assets, Estimated Fair Value | 4,688 | 3,301
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (2,124) | $ (2,805)

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- Definition Derivative, Liabilities Nonmonetary Notional Amount + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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