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Quarterly Results - Schedule of Income (Loss) from Continuing Operations and Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Selected Quarterly Financial Information [Abstract]
Net sales	$ 229,480	$ 209,855	$ 215,742	$ 211,209	$ 209,327	$ 210,120	$ 195,974	$ 184,941	$ 866,286	$ 800,362	$ 761,216
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross Profit	$ 30,674	$ 29,872	$ 33,300	$ 36,561	$ 38,337	$ 37,375	$ 35,096	$ 32,781	$ 130,407	$ 143,589	$ 131,749
Income (loss) from continuing operations	$ (3,289)	$ (705)	$ 1,278	$ 2,268	$ (14,699)	$ 5,045	$ 2,341	$ 1,701	$ (448)	$ (5,612)	$ (14,177)
Earnings (loss) per share	$ (0.08)	$ (0.02)	$ 0.03	$ 0.05	$ (0.34)	$ 0.11	$ 0.05	$ 0.04

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or 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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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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