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Note I - Business Segment Information (Detail) - Components of Customer Sales Determined Based on the Location of Customers (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Sales by Location (in Dollars) | $ 375,691 | $ 359,490 | $ 296,808
Percentage of Sales | 100.00% | 100.00% | 100.00%
United States [Member] |  |  |
Sales by Location (in Dollars) | 239,153 | 241,405 | 180,705
Percentage of Sales | 64.00% | 67.00% | 61.00%
Foreign Countries [Member] |  |  |
Sales by Location (in Dollars) | $ 136,538 | $ 118,085 | $ 116,103
Percentage of Sales | 36.00% | 33.00% | 39.00%

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | grc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a, b, c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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Period Type: | duration