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Summary of Worldwide Export Sales (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Worldwide Export Sales	$ 77,295	$ 73,706	$ 69,772
Mexico
Segment Reporting Information [Line Items]
Worldwide Export Sales	17,096	14,601	15,661
Central & South America
Segment Reporting Information [Line Items]
Worldwide Export Sales	15,970	16,585	15,491
Europe
Segment Reporting Information [Line Items]
Worldwide Export Sales	12,350	13,249	12,942
Asia
Segment Reporting Information [Line Items]
Worldwide Export Sales	13,847	7,683	8,129
Africa
Segment Reporting Information [Line Items]
Worldwide Export Sales	8,622	9,310	8,322
Australia
Segment Reporting Information [Line Items]
Worldwide Export Sales	4,158	4,202	2,692
Canada
Segment Reporting Information [Line Items]
Worldwide Export Sales	1,585	4,910	3,976
Middle East
Segment Reporting Information [Line Items]
Worldwide Export Sales	3,230	$ 3,166	2,500
Other
Segment Reporting Information [Line Items]
Worldwide Export Sales	$ 437		$ 59

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