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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, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Sales		$ 401,142		$ 776,155
Operating income		26,372		47,058
Net income		$ 17,442		$ 29,957
Basic net income per share	$ 0.20	$ 0.03	$ 0.29	$ 0.10
Diluted net income per share	$ 0.20	$ 0.25	$ 0.29	$ 0.44

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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