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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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Assets
Beginning balance	$ 312	$ 42	$ 91	$ 42
Transfers into Level 3
Transfers out of Level 3
Total realized and unrealized gains (losses) included in earnings	313		546
Purchases
Issuances
Sales			(12)
Settlements
Ending balance	625	42	625	42
Liabilities
Beginning balance	(312)	(42)	(91)	(42)
Transfers into Level 3
Transfers out of Level 3
Total realized and unrealized gains (losses) included in earnings	(313)		(546)
Purchases
Issuances
Sales
Settlements			12
Ending balance	$ (625)	$ (42)	$ (625)	$ (42)

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