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Summary of International Sales (Detail) - USD ($) $ 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
Revenues From External Customers
Net sales	$ 131,338	$ 111,780	$ 107,046	$ 104,108	$ 116,494	$ 89,975	$ 77,905	$ 70,673	$ 454,272	$ 355,047	$ 312,113
Asia
Revenues From External Customers
Net sales									14,828	28,880	17,138
South and Central America
Revenues From External Customers
Net sales									86,172	25,748	16,234
Mexico
Revenues From External Customers
Net sales									24,578	16,030	16,690
Europe
Revenues From External Customers
Net sales									11,059	10,700	14,519
Africa
Revenues From External Customers
Net sales									8,027	7,893	7,111
Australia
Revenues From External Customers
Net sales									2,635	4,334	3,735
Canada
Revenues From External Customers
Net sales									3,403	4,083	3,690
Middle East
Revenues From External Customers
Net sales									3,256	1,237	4,041
Other
Revenues From External Customers
Net sales											101
International
Revenues From External Customers
Net sales									$ 153,958	$ 98,905	$ 83,259

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Amount, excluding 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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