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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, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 62,426us-gaap_SalesRevenueNet	$ 52,633us-gaap_SalesRevenueNet	$ 47,654us-gaap_SalesRevenueNet	$ 38,823us-gaap_SalesRevenueNet	$ 43,265us-gaap_SalesRevenueNet	$ 39,156us-gaap_SalesRevenueNet	$ 37,260us-gaap_SalesRevenueNet	$ 35,365us-gaap_SalesRevenueNet	$ 201,537us-gaap_SalesRevenueNet	$ 155,047us-gaap_SalesRevenueNet	$ 154,029us-gaap_SalesRevenueNet
Gross profit	35,354us-gaap_GrossProfit	35,595us-gaap_GrossProfit	31,021us-gaap_GrossProfit	25,796us-gaap_GrossProfit	27,846us-gaap_GrossProfit	25,054us-gaap_GrossProfit	23,882us-gaap_GrossProfit	23,087us-gaap_GrossProfit	127,766us-gaap_GrossProfit	99,871us-gaap_GrossProfit	99,565us-gaap_GrossProfit
Operating expenses	22,645us-gaap_OperatingExpenses	21,753us-gaap_OperatingExpenses	23,375us-gaap_OperatingExpenses	21,905us-gaap_OperatingExpenses	23,805us-gaap_OperatingExpenses	20,023us-gaap_OperatingExpenses	21,958us-gaap_OperatingExpenses	20,372us-gaap_OperatingExpenses	89,678us-gaap_OperatingExpenses	86,159us-gaap_OperatingExpenses	78,538us-gaap_OperatingExpenses
Operating income	12,709us-gaap_OperatingIncomeLoss	13,842us-gaap_OperatingIncomeLoss	7,646us-gaap_OperatingIncomeLoss	3,891us-gaap_OperatingIncomeLoss	4,041us-gaap_OperatingIncomeLoss	5,031us-gaap_OperatingIncomeLoss	1,924us-gaap_OperatingIncomeLoss	2,715us-gaap_OperatingIncomeLoss	38,088us-gaap_OperatingIncomeLoss	13,712us-gaap_OperatingIncomeLoss	21,027us-gaap_OperatingIncomeLoss
Income from Continuing Operations	10,983us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	11,209us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	6,893us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3,526us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3,336us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3,369us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1,850us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	2,412us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	32,611us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	10,967us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	16,229us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income (loss) from Discontinued Operations	941us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(46)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(7)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(16)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(105)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(47)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(41)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	374us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	873us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	180us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(630)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income	$ 11,924us-gaap_NetIncomeLoss	$ 11,163us-gaap_NetIncomeLoss	$ 6,886us-gaap_NetIncomeLoss	$ 3,510us-gaap_NetIncomeLoss	$ 3,231us-gaap_NetIncomeLoss	$ 3,322us-gaap_NetIncomeLoss	$ 1,809us-gaap_NetIncomeLoss	$ 2,786us-gaap_NetIncomeLoss	$ 33,484us-gaap_NetIncomeLoss	$ 11,147us-gaap_NetIncomeLoss	$ 15,599us-gaap_NetIncomeLoss
Basic income/(loss) per share:
Continuing operations	$ 0.28us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.28us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.18us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.09us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.09us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.09us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.05us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.06us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.83us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.28us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.43us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued Operations	$ 0.02us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.02us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Total Net income per share	$ 0.30us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.08us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ 0.85us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic
Diluted income/(loss) per share:
Continuing operations	$ 0.28us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.28us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.17us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.09us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.09us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.08us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.05us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.06us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.83us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.28us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.42us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued Operations	$ 0.02us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.02us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Total Net income per share	$ 0.30us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.17us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.08us-gaap_EarningsPerShareDiluted	$ 0.08us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted	$ 0.85us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted

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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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