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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Valuation Allowances, State Tax Losses [Member]
Dec. 31, 2012
Valuation Allowances, State Tax Losses [Member]
Dec. 31, 2011
Valuation Allowances, State Tax Losses [Member]
Dec. 31, 2013
Valuation allowances, State Tax Credits [Member]
Dec. 31, 2012
Valuation allowances, State Tax Credits [Member]
Dec. 31, 2011
Valuation allowances, State Tax Credits [Member]
Dec. 31, 2013
Valuation Allowance Of Deferred Tax Foreign
Dec. 31, 2012
Valuation Allowance Of Deferred Tax Foreign
Dec. 31, 2011
Valuation Allowance Of Deferred Tax Foreign
Dec. 31, 2013
Cellulosic Biofuel Producer Credit [Member]
Sep. 30, 2013
Cellulosic Biofuel Producer Credit [Member]
Dec. 31, 2013
Alternative Fuel Mixture Tax Credit [Member]
Tax Credit Carryforward [Line Items]                              
Statutory federal income tax rate 35.00%                            
Unrecognized excess tax benefits   $ 1,400,000                          
Excess tax benefits allocated to deferred tax assets 2,300,000                            
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net 2,400,000 (15,800,000) (900,000)                        
Tax expense, reflecting remeasurement of state deferred tax assets and liabilities 700,000 700,000                          
Change for uncertain tax positions 69,100,000                           62,600,000
Deferred tax assets, gross 114,031,000 141,099,000                          
Deferred Tax Assets, Valuation Allowance 13,622,000 14,957,000                          
Change in valuation allowance (1,300,000) (6,900,000) (2,800,000) 1,200,000 500,000 (2,500,000) 400,000 (8,200,000) (2,200,000) (300,000) 800,000 1,900,000      
Unrecognized tax benefits , if recognized, would favorably impact effective tax rate 2,700,000                            
Accrued interest related to tax obligations 2,000,000 1,900,000 2,400,000                        
Federal and state credit carryforwards $ 27,597,000 $ 20,447,000                     $ 3,495,000 $ 3,500,000