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Derivatives - Fair Value of Derivative Contracts (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Derivatives, Fair Value |  |
Derivative assets | $ 137,484 | $ 130,403
Derivative liabilities | (54,402) | (110,411)
Total net derivative contracts | 83,082 | 19,992
Current assets |  |
Derivatives, Fair Value |  |
Derivative assets | 69,247 | 91,346
Current assets | Oil Price Swaps |  |
Derivatives, Fair Value |  |
Derivative assets | 46,648 | 88,052
Current assets | Natural Gas Price Swaps |  |
Derivatives, Fair Value |  |
Derivative assets | 13,230 | 0
Current assets | Oil Basis Swaps |  |
Derivatives, Fair Value |  |
Derivative assets | 0 | 183
Current assets | Oil Collars - Three Way |  |
Derivatives, Fair Value |  |
Derivative assets | 8,203 | 0
Current assets | Natural Gas Collars |  |
Derivatives, Fair Value |  |
Derivative assets | 1,166 | 3,111
Noncurrent assets |  |
Derivatives, Fair Value |  |
Derivative assets | 68,237 | 39,057
Noncurrent assets | Oil Price Swaps |  |
Derivatives, Fair Value |  |
Derivative assets | 41,167 | 37,983
Noncurrent assets | Oil Collars - Three Way |  |
Derivatives, Fair Value |  |
Derivative assets | 26,483 | 190
Noncurrent assets | Natural Gas Collars |  |
Derivatives, Fair Value |  |
Derivative assets | 587 | 884
Current liabilities |  |
Derivatives, Fair Value |  |
Derivative liabilities | (17,621) | (35,184)
Current liabilities | Oil Price Swaps |  |
Derivatives, Fair Value |  |
Derivative liabilities | (17,576) | (31,991)
Current liabilities | Oil Basis Swaps |  |
Derivatives, Fair Value |  |
Derivative liabilities | 0 | (695)
Current liabilities | Oil Collars - Two Way |  |
Derivatives, Fair Value |  |
Derivative liabilities | (45) | (103)
Current liabilities | Interest Rate Swap |  |
Derivatives, Fair Value |  |
Derivative liabilities | 0 | (2,395)
Noncurrent liabilities |  |
Derivatives, Fair Value |  |
Derivative liabilities | (36,781) | (75,227)
Noncurrent liabilities | Oil Price Swaps |  |
Derivatives, Fair Value |  |
Derivative liabilities | (36,781) | (67,900)
Noncurrent liabilities | Oil Collars - Three Way |  |
Derivatives, Fair Value |  |
Derivative liabilities | $ 0 | $ (7,327)

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- Definition Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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