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Summary of International Sales (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues From External Customers
Net sales	$ 87,468	$ 82,447	$ 72,724	$ 69,474	$ 83,808	$ 72,486	$ 66,523	$ 66,565	$ 312,113	$ 289,382	$ 298,634
Mexico
Revenues From External Customers
Net sales									16,690	17,096	14,601
South & Central America
Revenues From External Customers
Net sales									16,234	15,970	16,585
Europe
Revenues From External Customers
Net sales									14,519	12,350	13,249
Asia
Revenues From External Customers
Net sales									17,138	13,847	7,683
Africa
Revenues From External Customers
Net sales									7,111	8,622	9,310
Australia
Revenues From External Customers
Net sales									3,735	4,158	4,202
Canada
Revenues From External Customers
Net sales									3,690	1,585	4,910
Middle East
Revenues From External Customers
Net sales									4,041	3,230	3,166
Other
Revenues From External Customers
Net sales									101	437
International
Revenues From External Customers
Net sales									$ 83,259	$ 77,295	$ 73,706

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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