Quarterly Results of Operations (unaudited) - Schedule of 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
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 43,265	$ 39,156	$ 37,260	$ 35,365	$ 38,837	$ 36,292	$ 46,642	$ 32,258	$ 155,047	$ 154,029	$ 168,082
Gross profit	27,846	25,054	23,882	23,087	24,382	23,855	29,451	21,878	99,871	99,565	108,112
Operating expenses	23,805	20,023	21,958	20,372	20,843	17,579	20,454	19,663	86,159	78,538	83,347
Operating income	4,041	5,031	1,924	2,715	3,539	6,276	8,997	2,215	13,712	21,027	24,765
Net income-continuing operations	3,336	3,369	1,850	2,412	2,154	4,682	7,398	1,994	10,967	16,229	24,251
Income (loss) from Discontinued Operations	(105)	(47)	(41)	374	(137)	(173)	(236)	(84)	180	(630)	(6,118)
Net income	$ 3,231	$ 3,322	$ 1,809	$ 2,786	$ 2,017	$ 4,509	$ 7,162	$ 1,910	$ 11,147	$ 15,599	$ 18,133
Basic income/(loss) per share:
Continuing operations	$ 0.09	$ 0.09	$ 0.05	$ 0.06	$ 0.05	$ 0.12	$ 0.19	$ 0.05	$ 0.28	$ 0.43	$ 0.65
Discontinued operations	$ (0.01)	$ 0.00	$ 0.00	$ 0.01	$ 0.00	$ 0.00	$ (0.01)	$ 0.00	$ 0.00	$ (0.02)	$ (0.16)
Total Net income per share	$ 0.08	$ 0.09	$ 0.05	$ 0.07	$ 0.05	$ 0.12	$ 0.18	$ 0.05	$ 0.28	$ 0.41	$ 0.48
Diluted income/(loss) per share:
Continuing operations	$ 0.09	$ 0.08	$ 0.05	$ 0.06	$ 0.05	$ 0.12	$ 0.19	$ 0.05	$ 0.28	$ 0.42	$ 0.63
Discontinued operations	$ (0.01)	$ 0.00	$ 0.00	$ 0.01	$ 0.00	$ 0.00	$ (0.01)	$ 0.00	$ 0.00	$ (0.02)	$ (0.16)
Total Net income per share	$ 0.08	$ 0.08	$ 0.05	$ 0.07	$ 0.05	$ 0.12	$ 0.18	$ 0.05	$ 0.28	$ 0.40	$ 0.47

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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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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