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Derivatives, Hedges, Financial Instruments and Carbon Credits - Reconciliation of Beginning and Ending Balances for Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets [Abstract] |  |  |  |
Assets, Beginning balance | $ 4,049 | $ 1,673 | $ 2,779 | $ 1,284
Assets, Transfers into Level 3 | 0 | 0 | 0 | 0
Assets, Transfers out of Level 3 | 0 | 0 | 0 | 0
Assets, Total net realized and unrealized gains (losses) included in earnings |  |  | 1,334 | 1,925
Assets, Purchases | 0 | 0 | 0 | 0
Assets, Issuances | 0 | 0 | 0 | 0
Assets,Sales | (3,862) |  | (3,926) | (1,536)
Assets, Settlements | 0 | 0 | 0 | 0
Assets, Ending balance | 187 | 1,673 | 187 | 1,673
Total net gains (losses) for the period included in earnings attributed to the change in unrealized gains or losses on assets and liabilities still held at the reporting date |  |  | 177 | 1,004
Liabilities, Beginning balance | (4,049) | (1,673) | (2,779) | (1,284)
Liabilities, Transfers into Level 3 | 0 | 0 | 0 | 0
Liabilities, Transfers out of Level 3 | 0 | 0 | 0 | 0
Liabilities, Total net realized and unrealized gains (losses) included in earnings | 904 |  | (430) | (1,634)
Liabilities, Purchases | 0 | 0 | 0 | 0
Liabilities, Issuances | 0 | 0 | 0 | 0
Liabilities, Sales | 0 | 0 | 0 | 0
Liabilities, Settlements | 2,958 |  | 3,022 | 1,245
Liabilities, Ending balance | $ (187) | $ (1,673) | (187) | (1,673)
Total net gains (losses) for the period included in earnings attributed to the change in unrealized gains or losses on assets and liabilities still held at the reporting date |  |  | $ (177) | $ (1,004)

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis assets. + References No definition available. + Details
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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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