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Unaudited Pro Forma Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Sales	$ 401,142	$ 371,936	$ 776,155	$ 676,863
Operating income	26,372	11,262	47,058	20,956
Net income	$ 17,442	$ 2,323	$ 29,957	$ 3,794
Basic net income per share	$ 0.26	$ 0.03	$ 0.44	$ 0.06
Diluted net income per share	$ 0.25	$ 0.03	$ 0.44	$ 0.06

X

- Definition

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.

+ References

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