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Summary of Worldwide Export Sales (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Worldwide Export Sales	$ 69,909	$ 63,454	$ 39,049
Mexico
Segment Reporting Information [Line Items]
Worldwide Export Sales	17,980	16,616	13,887
Central & South America
Segment Reporting Information [Line Items]
Worldwide Export Sales	16,374	11,991	7,541
Asia
Segment Reporting Information [Line Items]
Worldwide Export Sales	7,308	8,469	5,485
Africa
Segment Reporting Information [Line Items]
Worldwide Export Sales	7,229	8,234	2,575
Europe
Segment Reporting Information [Line Items]
Worldwide Export Sales	9,744	5,931	2,275
Canada
Segment Reporting Information [Line Items]
Worldwide Export Sales	4,320	4,270	5,100
Middle East
Segment Reporting Information [Line Items]
Worldwide Export Sales	2,495	3,876	1,051
Australia
Segment Reporting Information [Line Items]
Worldwide Export Sales	4,444	3,395	1,135
Other
Segment Reporting Information [Line Items]
Worldwide Export Sales	$ 15	$ 672

X

- Definition

Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 38

-Subparagraph a(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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