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Alternative Energy Tax Credits - Additional Information (Detail) (USD $)
 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Alternative Fuel Mixture Credits
Mar. 31, 2012
Alternative Fuel Mixture Credits
Dec. 31, 2010
Alternative Fuel Mixture Credits
Dec. 31, 2009
Alternative Fuel Mixture Credits
Dec. 31, 2013
Cellulosic Biofuel Tax Credits
Mar. 31, 2012
Cellulosic Biofuel Tax Credits
Dec. 31, 2010
Cellulosic Biofuel Tax Credits
Dec. 31, 2009
Cellulosic Biofuel Tax Credits
Dec. 31, 2012
Alternative Energy Tax Credits
Mar. 31, 2012
Alternative Energy Tax Credits
Dec. 31, 2012
Alternative Energy Tax Credits
Dec. 31, 2010
Alternative Energy Tax Credits
Dec. 31, 2010
Alternative Energy Tax Credits
Additional
Dec. 31, 2013
Tax Related to Cellulosic Biofuel Tax Credits
Dec. 31, 2013
Accrued Interest Related to Cellulosic Biofuel Tax Credits
Dec. 31, 2013
Other Long-Term Liabilities
Alternative Fuel Mixture Credits
Dec. 31, 2013
Deferred Tax Asset
Alternative Fuel Mixture Credits
Alternative Energy Tax Credits [Line Items]                                          
Refundable tax credit per gallon               $ 0.50       $ 1.01                  
Alternative energy tax credits           95,500,000 (86,300,000)           3,400,000 (23,000,000)           13,100,000 49,000,000
(Provision) benefit for income taxes (17,729,000) 214,463,000 85,971,000   62,100,000       103,900,000 (118,500,000) 135,500,000             102,000,000 1,900,000    
Expenses related to alternative energy tax credits                                 1,600,000        
Income (charge) related to alternative energy tax credits                         3,400,000 (23,000,000) (19,600,000) 47,700,000          
Uncertain tax positions       $ 102,000,000