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Quarterly Financial Information - Quarterly Results of Operations (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	$ 98,543	$ 100,828	$ 111,716	$ 98,689	$ 104,200	$ 114,206	$ 111,940	$ 108,846
Gross profit	30,393	31,660	37,549	31,299	32,953	38,507	36,966	36,012	130,901	144,438	140,849
Income before income taxes	5,653	8,544	10,680	6,917	9,313	13,410	9,913	12,191	31,794	44,827	45,994
Net income	$ 3,132	$ 6,104	$ 6,386	$ 4,965	$ 5,273	$ 9,284	$ 6,596	$ 8,133	$ 20,587	$ 29,286	$ 30,984
Net income, basic	$ 0.59	$ 1.14	$ 1.19	$ 0.92	$ 0.99	$ 1.75	$ 1.24	$ 1.52	$ 3.84	$ 5.50	$ 5.89
Net income, diluted	$ 0.58	$ 1.12	$ 1.17	$ 0.91	$ 0.98	$ 1.71	$ 1.21	$ 1.50	$ 3.77	$ 5.45	$ 5.78

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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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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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