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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, 2013 bbl | Dec. 31, 2012 bbl
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Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural gas - assets | 673,000 | 464,000
Oil/Natural gas - liabilities | 607,000 | 402,000
Oil/Natural gas - assets | $ 1,389 | $ 2,188
Oil/Natural gas - liabilities | (965) | (1,590)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural gas - assets | 10,600,000 | 120,000
Oil/Natural gas - liabilities | 5,470,000 | 120,000
Oil/Natural gas - assets | 3,435 | 19
Oil/Natural gas - liabilities | (829) | (24)
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural gas - assets | 387,000 | 402,000
Oil/Natural gas - liabilities | 567,000 | 464,000
Oil/Natural gas - assets | 595 | 1,636
Oil/Natural gas - liabilities | (1,309) | (2,139)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural gas - assets | 5,796,000 | 120,000
Oil/Natural gas - liabilities | 10,600,000 | 120,000
Oil/Natural gas - assets | 1,236 | 24
Oil/Natural gas - liabilities | $ (3,330) | $ (19)

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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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