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Financial Instruments - Effect of Derivative Instruments on Condensed Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative assets	$ 1,386	$ 1,347
Derivative liabilities	(2,969)	(1,425)
Total derivative instruments	(1,583)	(78)
Other assets [Member] | Interest rate swap [Member] | Derivatives designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	135
Other assets [Member] | Crude oil commodity contracts [Member] | Derivatives not designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	703	118
Other assets [Member] | Natural gas commodity contracts [Member] | Derivatives not designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	25
Other current assets [Member] | Crude oil commodity contracts [Member] | Derivatives not designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets		189
Other current assets [Member] | Natural gas commodity contracts [Member] | Derivatives not designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	523	1,040
Derivative liability short-term [Member] | Interest rate swap [Member] | Derivatives designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(158)
Derivative liability short-term [Member] | Crude oil commodity contracts [Member] | Derivatives not designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(2,598)	(994)
Derivative liability short-term [Member] | Natural gas commodity contracts [Member] | Derivatives not designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(4)
Derivative liability long-term [Member] | Interest rate swap [Member] | Derivatives designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(64)	(54)
Derivative liability long-term [Member] | Crude oil commodity contracts [Member] | Derivatives not designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (145)	$ (377)

X

- Definition

Fair value of 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, elected not to be offset against an obligation to return collateral under a master netting arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (d)

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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313

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X

- Definition

Fair value of 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, elected not to be offset against a right to receive collateral under a master netting arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (d)

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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313



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-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313

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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

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-Section 45

-Paragraph 5

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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611



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