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Pro Forma Results Under Acquisitions (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010
Business Acquisition, Pro Forma Information [Line Items] |  |
Revenue | $ 1,527,044 | $ 1,652,153
Income from continuing operations | 357,060 | 309,549
Net income | $ 382,976 | $ 314,972
Income from continuing operations per common share, basic | $ 1.93 | $ 1.72
Income from continuing operations per common share, diluted | $ 1.56 | $ 1.42
Net income per common share, basic | $ 2.07 | $ 1.75
Net income per common share, diluted | $ 1.67 | $ 1.44

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