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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, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Assets |  |
Beginning balance | $ 1,284 | $ 91
Transfers into Level 3 |  |
Transfers out of Level 3 |  |
Total realized and unrealized gain (loss) included in operating results | 1,925 | 233
Purchases |  |
Issuances |  |
Sales | (1,536) | (12)
Settlements |  |
Ending balance | 1,673 | 312
Total gains (losses) for the period included in operating results attributed to the change in unrealized gains or losses on assets and liabilities still held at the reporting date | 1,004 | 221
Liabilities |  |
Beginning balance | (1,284) | (91)
Transfers into Level 3 |  |
Transfers out of Level 3 |  |
Total realized and unrealized gain (loss) included in operating results | (1,634) | (233)
Purchases |  |
Issuances |  |
Sales |  |
Settlements | 1,245 | 12
Ending balance | (1,673) | (312)
Total gains (losses) for the period included in operating results attributed to the change in unrealized gains or losses on assets and liabilities still held at the reporting date | $ (1,004) | $ (221)

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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=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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