Summarized Quarterly Financial Data (Unaudited) - Quarterly Operating Results (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
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 159,094	$ 177,404	$ 162,233	$ 143,013	$ 139,756	$ 162,125	$ 183,998	$ 134,735	$ 641,744	$ 620,614	$ 717,229
Gross profit	76,864	82,547	79,798	69,677	67,383	79,972	95,201	74,087	308,886	316,643	414,318
Operating income	10,639	17,210	14,053	6,563	2,874	10,276	26,838	16,181	48,465	56,169	189,138
Net Income	$ 11,840	$ 16,205	$ 9,859	$ 7,890	$ 3,961	$ 9,272	$ 21,070	$ 12,960	$ 45,794	$ 47,263	$ 138,577
Earnings per common share	$ 0.21	$ 0.28	$ 0.17	$ 0.13	$ 0.06	$ 0.15	$ 0.33	$ 0.20	$ 0.78	$ 0.75	$ 2.16
Earnings per common share assuming dilution	$ 0.20	$ 0.28	$ 0.17	$ 0.13	$ 0.06	$ 0.15	$ 0.33	$ 0.20	$ 0.77	$ 0.74	$ 2.12