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Summary of International Sales (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues From External Customers
Net sales	$ 140,747	$ 117,439	$ 104,555	$ 95,962	$ 130,521	$ 124,884	$ 113,104	$ 99,676	$ 458,704	$ 468,186	$ 454,272
South and Central America
Revenues From External Customers
Net sales									102,281	111,106	86,172
Mexico
Revenues From External Customers
Net sales									33,517	28,835	24,578
Asia
Revenues From External Customers
Net sales									19,290	15,554	14,828
Canada
Revenues From External Customers
Net sales									10,572	11,637	3,403
Australia
Revenues From External Customers
Net sales									9,902	2,798	2,635
Africa
Revenues From External Customers
Net sales									6,072	6,750	8,027
Middle East
Revenues From External Customers
Net sales									3,054	2,392	3,256
Europe
Revenues From External Customers
Net sales									2,292	6,889	11,059
International
Revenues From External Customers
Net sales									$ 186,980	$ 185,961	$ 153,958

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