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Derivatives - Fair Value of Derivative Contracts (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value
Derivative assets	$ 58,086	$ 130,403
Derivative liabilities	(95,315)	(110,411)
Total net derivative contracts	(37,229)	19,992
Current assets
Derivatives, Fair Value
Derivative assets	21,686	91,346
Current assets | Oil Price Swaps
Derivatives, Fair Value
Derivative assets	14,585	88,052
Current assets | Natural Gas Price Swaps
Derivatives, Fair Value
Derivative assets	6,374	0
Current assets | Oil Basis Swaps
Derivatives, Fair Value
Derivative assets	0	183
Current assets | Natural Gas Collars
Derivatives, Fair Value
Derivative assets	727	3,111
Noncurrent assets
Derivatives, Fair Value
Derivative assets	36,400	39,057
Noncurrent assets | Oil Price Swaps
Derivatives, Fair Value
Derivative assets	23,050	37,983
Noncurrent assets | Oil Collars - Three Way
Derivatives, Fair Value
Derivative assets	12,837	190
Noncurrent assets | Natural Gas Collars
Derivatives, Fair Value
Derivative assets	513	884
Current liabilities
Derivatives, Fair Value
Derivative liabilities	(49,851)	(35,184)
Current liabilities | Oil Price Swaps
Derivatives, Fair Value
Derivative liabilities	(43,519)	(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	(92)	(103)
Current liabilities | Oil Collars - Three Way
Derivatives, Fair Value
Derivative liabilities	(6,240)	0
Current liabilities | Interest Rate Swap
Derivatives, Fair Value
Derivative liabilities	0	(2,395)
Noncurrent liabilities
Derivatives, Fair Value
Derivative liabilities	(45,464)	(75,227)
Noncurrent liabilities | Oil Price Swaps
Derivatives, Fair Value
Derivative liabilities	(45,464)	(67,900)
Noncurrent liabilities | Oil Collars - Three Way
Derivatives, Fair Value
Derivative liabilities	$ 0	$ (7,327)

X

- Definition

Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312



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 before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312



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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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=28364263&loc=d3e13433-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-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=28364263&loc=d3e13495-108611



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-Publisher FASB

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-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

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

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