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Derivatives - Fair Value of Derivative Contracts (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative assets	$ 90,707	$ 130,403
Derivative liabilities	(93,149)	(110,411)
Total net derivative contracts	(2,442)	19,992
Current assets
Derivatives, Fair Value [Line Items]
Derivative assets	45,339	91,346
Current assets | Oil Price Swaps
Derivatives, Fair Value [Line Items]
Derivative assets	44,306	88,052
Current assets | Oil Basis Swaps
Derivatives, Fair Value [Line Items]
Derivative assets	122	183
Current assets | Oil Collars - Three Way
Derivatives, Fair Value [Line Items]
Derivative assets	311	0
Current assets | Natural Gas Collars
Derivatives, Fair Value [Line Items]
Derivative assets	600	3,111
Noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets	45,368	39,057
Noncurrent assets | Oil Price Swaps
Derivatives, Fair Value [Line Items]
Derivative assets	32,710	37,983
Noncurrent assets | Oil Collars - Three Way
Derivatives, Fair Value [Line Items]
Derivative assets	12,019	190
Noncurrent assets | Natural Gas Collars
Derivatives, Fair Value [Line Items]
Derivative assets	639	884
Current liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	(32,616)	(35,184)
Current liabilities | Oil Price Swaps
Derivatives, Fair Value [Line Items]
Derivative liabilities	(29,161)	(31,991)
Current liabilities | Natural Gas Price Swap
Derivatives, Fair Value [Line Items]
Derivative liabilities	(2,985)	0
Current liabilities | Oil Basis Swaps
Derivatives, Fair Value [Line Items]
Derivative liabilities	(333)	(695)
Current liabilities | Oil Collars - Two Way
Derivatives, Fair Value [Line Items]
Derivative liabilities	(137)	(103)
Current liabilities | Interest rate swap
Derivatives, Fair Value [Line Items]
Derivative liabilities	0	(2,395)
Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	(60,533)	(75,227)
Noncurrent liabilities | Oil Price Swaps
Derivatives, Fair Value [Line Items]
Derivative liabilities	(60,533)	(67,900)
Noncurrent liabilities | Oil Collars - Three Way
Derivatives, Fair Value [Line Items]
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

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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 815

-SubTopic 10

-Section 45

-Paragraph 6

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



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-Publisher FASB

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-Topic 815

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-Section 45

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