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Pro Forma Consolidated Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2011
Business Acquisition [Line Items]
Revenue	$ 2,167,037
Net income	$ 41,976
Earnings per share
Basic	$ 1.14
Diluted	$ 1.13

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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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