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Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | $ 2,565,943 | $ 1,462,931 | $ 781,946
Operating income | 525,601 | 200,925 | (48,214)
Income from continuing operations, net of income taxes | 322,780 | 117,898 | (33,960)
Loss from discontinued operations, net of income taxes | (367) | (956) | (4,330)
Net income | 322,413 | 116,942 | (38,290)
Basic income (loss) per common share: |  |  |
From continuing operations | $ 2.08 | $ 0.77 | $ (0.22)
From discontinued operations | $ 0.00 | $ (0.01) | $ (0.03)
Net income | $ 2.08 | $ 0.76 | $ (0.25)
Diluted income (loss) per common share: |  |  |
From continuing operations | $ 2.06 | $ 0.76 | $ (0.22)
From discontinued operations | $ 0.00 | $ (0.01) | $ (0.03)
Net income | $ 2.06 | $ 0.76 | $ (0.25)
First Quarter |  |  |
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | 567,404 | 271,598 |
Operating income | 117,547 | 7,831 |
Income from continuing operations, net of income taxes | 71,619 | 4,186 |
Loss from discontinued operations, net of income taxes | (367) |  |
Net income | 71,252 | 4,186 |
Basic income (loss) per common share: |  |  |
From continuing operations | $ 0.46 | $ 0.03 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.46 | $ 0.03 |
Diluted income (loss) per common share: |  |  |
From continuing operations | $ 0.46 | $ 0.03 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.46 | $ 0.03 |
Second Quarter |  |  |
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | 600,064 | 306,992 |
Operating income | 131,860 | 45,757 |
Income from continuing operations, net of income taxes | 81,638 | 29,528 |
Net income | 81,638 | 29,528 |
Basic income (loss) per common share: |  |  |
From continuing operations | $ 0.53 | $ 0.19 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.53 | $ 0.19 |
Diluted income (loss) per common share: |  |  |
From continuing operations | $ 0.52 | $ 0.19 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.52 | $ 0.19 |
Third Quarter |  |  |
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | 673,828 | 378,663 |
Operating income | 132,294 | 52,509 |
Income from continuing operations, net of income taxes | 81,928 | 29,374 |
Net income | 81,928 | 29,374 |
Basic income (loss) per common share: |  |  |
From continuing operations | $ 0.53 | $ 0.19 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.53 | $ 0.19 |
Diluted income (loss) per common share: |  |  |
From continuing operations | $ 0.53 | $ 0.19 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.53 | $ 0.19 |
Fourth Quarter |  |  |
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | 724,647 | 505,678 |
Operating income | 143,900 | 94,828 |
Income from continuing operations, net of income taxes | 87,595 | 54,810 |
Loss from discontinued operations, net of income taxes |  | (956) |
Net income | $ 87,595 | $ 53,854 |
Basic income (loss) per common share: |  |  |
From continuing operations | $ 0.56 | $ 0.36 |
From discontinued operations | $ 0.00 | $ (0.01) |
Net income | $ 0.56 | $ 0.35 |
Diluted income (loss) per common share: |  |  |
From continuing operations | $ 0.56 | $ 0.35 |
From discontinued operations | $ 0.00 | $ (0.01) |
Net income | $ 0.56 | $ 0.35 |

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X
- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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