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Summary of International Sales (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues From External Customers
Net sales	$ 116,494	$ 89,975	$ 77,905	$ 70,673	$ 87,468	$ 82,447	$ 72,724	$ 69,474	$ 355,047	$ 312,113	$ 289,382
Mexico
Revenues From External Customers
Net sales									16,030	16,690	17,096
South and Central America
Revenues From External Customers
Net sales									25,748	16,234	15,970
Europe
Revenues From External Customers
Net sales									10,700	14,519	12,350
Asia
Revenues From External Customers
Net sales									28,880	17,138	13,847
Africa
Revenues From External Customers
Net sales									7,893	7,111	8,622
Australia
Revenues From External Customers
Net sales									4,334	3,735	4,158
Canada
Revenues From External Customers
Net sales									4,083	3,690	1,585
Middle East
Revenues From External Customers
Net sales									1,237	4,041	3,230
Other
Revenues From External Customers
Net sales										101	437
International
Revenues From External Customers
Net sales									$ 98,905	$ 83,259	$ 77,295

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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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