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Quarterly Financial Data - Additional Information (Detail) (USD $) | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2012 Refinancing of Debt | Jun. 30, 2012 Refinancing of Debt | Dec. 31, 2012 State Income Tax | Dec. 31, 2012 Plant Closure | Dec. 31, 2011 Discontinued Operation Or Asset Disposals | Sep. 30, 2011 Discontinued Operation Or Asset Disposals | Jun. 30, 2011 Discontinued Operation Or Asset Disposals | Mar. 31, 2011 Discontinued Operation Or Asset Disposals | Jun. 30, 2011 Medical Benefits Reserves | Mar. 31, 2012 Alternative Fuel Mixture Credits | Mar. 31, 2012 Cellulosic Biofuel Tax Credits | Mar. 31, 2012 Alternative Energy Tax Credits
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative energy tax credits |  |  |  |  |  |  |  |  |  |  |  |  | $ 95,500,000 |  | $ 23,000,000
Provision for income taxes | 216,739,000 | 85,477,000 | (52,331,000) |  |  |  |  |  |  |  |  |  |  | 118,500,000 |
Decrease (Increase) in net income per share |  |  |  | $ 0.14 | $ 0.025 | $ (0.03) | $ 0.01 | $ 0.005 | $ 0.010 | $ 0.010 | $ 0.020 | $ (0.01) |  | $ 0.24 |
Decrease (Increase)in net income |  |  |  | $ 13,500,000 | $ 2,500,000 | $ (3,400,000) | $ 1,400,000 | $ 500,000 | $ 1,000,000 | $ 1,200,000 | $ 2,100,000 | $ (1,000,000) |  |  |

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