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Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | $ 2,723,414 | $ 2,565,943 | $ 1,462,931
Operating income | 497,361 | 525,601 | 200,925
Income from continuing operations, net of income taxes | 299,477 | 322,780 | 117,898
Loss from discontinued operations, net of income taxes |  | (367) | (956)
Net income | 299,477 | 322,413 | 116,942
Basic income per common share: |  |  |
From continuing operations | $ 1.96 | $ 2.08 | $ 0.77
From discontinued operations | $ 0.00 | $ 0.00 | $ (0.01)
Net income | $ 1.96 | $ 2.08 | $ 0.76
Diluted income per common share: |  |  |
From continuing operations | $ 1.96 | $ 2.06 | $ 0.76
From discontinued operations | $ 0.00 | $ 0.00 | $ (0.01)
Net income | $ 1.96 | $ 2.06 | $ 0.76
First Quarter |  |  |
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | 745,921 | 567,404 |
Operating income | 157,664 | 117,547 |
Income from continuing operations, net of income taxes | 97,274 | 71,619 |
Loss from discontinued operations, net of income taxes |  | (367) |
Net income | 97,274 | 71,252 |
Basic income per common share: |  |  |
From continuing operations | $ 0.62 | $ 0.46 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.62 | $ 0.46 |
Diluted income per common share: |  |  |
From continuing operations | $ 0.62 | $ 0.46 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.62 | $ 0.46 |
Second Quarter |  |  |
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | 681,112 | 600,064 |
Operating income | 150,894 | 131,860 |
Income from continuing operations, net of income taxes | 92,538 | 81,638 |
Net income | 92,538 | 81,638 |
Basic income per common share: |  |  |
From continuing operations | $ 0.60 | $ 0.53 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.60 | $ 0.53 |
Diluted income per common share: |  |  |
From continuing operations | $ 0.60 | $ 0.52 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.60 | $ 0.52 |
Third Quarter |  |  |
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | 643,631 | 673,828 |
Operating income | 88,594 | 132,294 |
Income from continuing operations, net of income taxes | 50,806 | 81,928 |
Net income | 50,806 | 81,928 |
Basic income per common share: |  |  |
From continuing operations | $ 0.34 | $ 0.53 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.34 | $ 0.53 |
Diluted income per common share: |  |  |
From continuing operations | $ 0.33 | $ 0.53 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.33 | $ 0.53 |
Fourth Quarter |  |  |
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | 652,750 | 724,647 |
Operating income | 100,209 | 143,900 |
Income from continuing operations, net of income taxes | 58,859 | 87,595 |
Net income | $ 58,859 | $ 87,595 |
Basic income per common share: |  |  |
From continuing operations | $ 0.40 | $ 0.56 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.40 | $ 0.56 |
Diluted income per common share: |  |  |
From continuing operations | $ 0.40 | $ 0.56 |
From discontinued operations | $ 0.00 | $ 0.00 |
Net income | $ 0.40 | $ 0.56 |

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- 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 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
Name: | us-gaap_SalesRevenueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration