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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
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assets      
Beginning balance $ 91 $ 42 $ 644
Transfers into Level 3       
Transfers out of Level 3       
Total realized and unrealized gains (losses) included in earnings 1,233 876 1,995
Purchases       
Issuances       
Sales (40) (827) (2,597)
Settlements       
Ending balance 1,284 91 42
Total 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 1,193 78 42
Liabilities      
Beginning balance (91) (42) (644)
Transfers into Level 3       
Transfers out of Level 3       
Total realized and unrealized gains (losses) included in earnings (1,233) (721) (1,844)
Purchases       
Issuances       
Sales       
Settlements 40 672 2,446
Ending balance (1,284) (91) (42)
Total 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 $ (1,193) $ (78) $ (42)