Acquisitions (Schedule of Pro Forma Financial Information) (Detail) (Allstar Business Solutions Limited [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Allstar Business Solutions Limited [Member]
Business Acquisition [Line Items]
Revenues, net	$ 595,864	$ 505,287
Income before income taxes	223,251	162,153
Net income	$ 156,430	$ 115,496
Earnings per share, Basic	$ 1.94	$ 3.22
Earnings per share, Diluted	$ 1.87	$ 1.43
Weighted average shares outstanding, Basic	80,610	35,434
Weighted average shares outstanding, Diluted	83,654	80,751

Business Acquisition Pro Forma Net Income Losses Before Income Taxes

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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The weighted average number of shares or units and dilutive common stock or unit equivalents outstanding in the calculation of proforma diluted earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering.

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The weighted average number of shares (units) outstanding in the calculation of pro forma basic earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering.

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