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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets
Derivative assets	$ 3,516	$ 1,347
Liabilities
Derivative liabilities	(880)	(1,425)
Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	3,516	1,347
Liabilities
Derivative liabilities	(880)	(1,425)
Commodity derivative contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	3,188	1,347
Liabilities
Derivative liabilities	(814)	(1,371)
Interest rate derivative contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	328
Liabilities
Derivative liabilities	(66)	(54)
Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets
Liabilities
Derivative liabilities
Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Commodity derivative contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets
Liabilities
Derivative liabilities
Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Interest rate derivative contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets
Liabilities
Derivative liabilities
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets
Liabilities
Derivative liabilities
Significant Other Observable Inputs (Level 2) [Member] | Commodity derivative contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets
Liabilities
Derivative liabilities
Significant Other Observable Inputs (Level 2) [Member] | Interest rate derivative contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets
Liabilities
Derivative liabilities
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	3,516	1,347
Liabilities
Derivative liabilities	(880)	(1,425)
Significant Unobservable Inputs (Level 3) [Member] | Commodity derivative contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	3,188	1,347
Liabilities
Derivative liabilities	(814)	(1,371)
Significant Unobservable Inputs (Level 3) [Member] | Interest rate derivative contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	328
Liabilities
Derivative liabilities	$ (66)	$ (54)

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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

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 20

-Section 50

-Paragraph 3

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-Name Accounting Standards Codification

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section 55

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



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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



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



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-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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