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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
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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 | (20,951,000) | 216,739,000 | 85,477,000 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the net income impact from the alternative energy tax credits. + References No definition available. + Details
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- Details
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- Definition The total amount of tax credits earned for the production and use of alternative fuels in an entity's trade or business. + References No definition available. + Details
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- Definition Represents expenses incurred related to the alternative energy tax credits. + References No definition available. + Details
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- Definition Represents the increase or decrease during the period in the reserve for uncertain tax positions. + References No definition available. + Details
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- Definition Represents tax credit per gallon of alternative fuel produced. + References No definition available. + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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