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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 |

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- 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of Financial Accounting Standard (FAS) -Number 131 -Paragraph 38 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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