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Combined Pro Forma of Revenues and Net Earnings (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Business Acquisition [Line Items]
Revenues	$ 292,580	$ 318,932	$ 885,878	$ 966,926
Income from continuing operations, net of taxes	$ 9,622	$ 16,380	$ 24,296	$ 41,164
Basic	$ 0.22	$ 0.36	$ 0.57	$ 0.89
Diluted	$ 0.22	$ 0.36	$ 0.57	$ 0.89

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect per basic share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

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- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, per diluted share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

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