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Alternative Energy Tax Credits - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2010 | Mar. 31, 2012 Alternative Fuel Mixture Credits | Dec. 31, 2009 Alternative Fuel Mixture Credits | Mar. 31, 2012 Cellulosic Biofuel Tax Credits | Dec. 31, 2009 Cellulosic Biofuel Tax Credits | Dec. 31, 2010 Amended Two Thousand Nine Federal Return | Mar. 31, 2012 Alternative Energy Tax Credits
Alternative Energy Tax Credits [Line Items] |  |  |  |  |  |  |  |  |  |  |
Refundable tax credit per gallon |  |  |  |  |  |  | $ 0.50 |  | $ 1.01 |  |
Cellulosic biofuel producer credits |  |  |  |  |  |  |  |  |  | 107,000,000 |
Uncertain tax positions |  |  |  |  | 102,000,000 |  |  |  |  |  |
Alternative energy tax credits |  |  |  |  |  |  |  |  |  |  | (23,000,000)
Provision for income taxes | 33,573,000 | 25,448,000 | 66,955,000 | 167,031,000 |  |  |  | 118,500,000 |  |  |
Alternative energy tax credits |  |  |  | 95,500,000 |  | 95,500,000 |  |  |  |  |
Change in reserve for unrecognized tax benefit, minimum | 0 |  | 0 |  |  |  |  |  |  |  |
Change in reserve for unrecognized tax benefit, maximum | 105,000,000 |  | 105,000,000 |  |  |  |  |  |  |  |
Tax credits used to offset future cash tax payment | $ 3,900,000 |  | $ 3,900,000 |  |  |  |  |  |  |  |

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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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- Definition Represents the cellulosic biofuel producer credits before any reserves for uncertain tax positions. + 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 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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- Definition The estimated lower bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The estimated upper bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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