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Quarterly Results - Schedule of Net Income (Loss) and Earnings (Loss) Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Quarterly Financial Information [Abstract]
Net sales	$ 434,811	$ 456,648	$ 425,967	$ 405,189	$ 391,389	$ 404,354	$ 384,693	$ 397,352	$ 1,722,615	$ 1,577,788	$ 1,603,154
Gross profit	54,406	66,039	40,840	57,375	52,609	59,192	40,878	60,970	218,660	213,649	206,193
Net Income	$ 16,477	$ 34,119	$ 933	$ 15,629	$ 6,970	$ 20,099	$ 13,432	$ 18,878
Diluted earnings per share	$ 0.37	$ 0.77	$ 0.02	$ 0.36	$ 0.16	$ 0.46	$ 0.31	$ 0.43	$ 1.52	$ 1.36	$ 0.93

X

- 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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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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