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Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Operations (Detail) (Derivatives Not Designated as Cash-Flow Hedging Instruments [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Derivatives not designated as cash-flow hedge instruments: |  |
Amount of gain/loss recognized in income | $ (1,971) | $ 3,985
Unrealized 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 | (1,309) | 1,040
Unrealized 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 | 660 | 2,443
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 | 796 |
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 | $ (2,118) | $ 502

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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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