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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |  |  | 12 Months Ended
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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 |

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- Definition A reduction in federal net operating loss deferred tax assets, resulting from excess tax benefits from share-based compensation not recognized in additional paid-in capital. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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