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Derivatives - Fair Value of Derivative Contracts (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
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)

X

- 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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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)

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X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611



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-Publisher FASB

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-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

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-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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