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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, 2013 | Mar. 31, 2012
Assets |  |
Beginning balance | $ 91 | $ 42
Transfers into Level 3 |  |
Transfers out of Level 3 |  |
Total realized and unrealized gain (loss) included in operating results | 233 |
Purchases |  |
Issuances |  |
Sales | (12) |
Settlements |  |
Ending balance | 312 | 42
Liabilities |  |
Beginning balance | (91) | (42)
Transfers into Level 3 |  |
Transfers out of Level 3 |  |
Total realized and unrealized gain (loss) included in operating results | (233) |
Purchases |  |
Issuances |  |
Sales |  |
Settlements | 12 |
Ending balance | $ (312) | $ (42)

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