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)

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

(12)

312

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)

$ (312)

$ (42)

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