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Financial Instruments - Effect of Derivative Instruments on Condensed Consolidated Statement of Operations (Detail) (Derivatives not designated as cash-flow hedging instruments [Member], USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Derivatives not designated as cash-flow hedge instruments |  |
Amount of gain/loss recognized in income | $ 2,471 | $ 5,439
Unrealized loss on derivative instruments, net [Member] | Natural gas commodity contracts [Member] |  |
Derivatives not designated as cash-flow hedge instruments |  |
Amount of gain/loss recognized in income | (437) |
Unrealized gain on derivative instruments, net [Member] | Crude oil commodity contracts [Member] |  |
Derivatives not designated as cash-flow hedge instruments |  |
Amount of gain/loss recognized in income | 2,834 | 5,098
Realized gain (loss) on derivative instruments, net [Member] | Natural gas commodity contracts [Member] |  |
Derivatives not designated as cash-flow hedge instruments |  |
Amount of gain/loss recognized in income | 331 |
Realized gain (loss) on derivative instruments, net [Member] | Crude oil commodity contracts [Member] |  |
Derivatives not designated as cash-flow hedge instruments |  |
Amount of gain/loss recognized in income | $ (257) | $ 341

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Details
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