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Financial Instruments - Effect of Derivative Instruments on Condensed Consolidated Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | $ (421) | $ 2,471
Derivatives Designated as Cash-Flow Hedging Instruments [Member] | Interest Rate Swap [Member] | Interest Expense [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | (210) |
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Unrealized Gain (Loss) on Derivative Instruments, Net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | 565 | (437)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Realized Gain (Loss) on Derivative Instruments, Net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | (580) | 331
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Unrealized Gain (Loss) on Derivative Instruments, Net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | 1,796 | 2,834
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Realized Gain (Loss) on Derivative Instruments, Net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | $ (1,992) | $ (257)

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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=35706170&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=35706170&loc=SL5624171-113959 + Details
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