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Note H - Goodwill and Other Intangible Assets (Detail) - Major Components of Goodwill and Other Intangible Assets (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Goodwill [Member] |  |
Historical Cost | $ 17,452 | $ 14,672
Trade Names And Trade Marks [Member] |  |
Historical Cost | 3,532 | 2,920
Total [Member] |  |
Historical Cost | 36,700 | 29,023
Accumulated Amortization | 4,414 | 3,542
Customer Relationships [Member] |  |
Historical Cost | 8,366 | 5,274
Accumulated Amortization | 1,582 | 1,011
Technology And Drawings [Member] |  |
Historical Cost | 5,790 | 4,600
Accumulated Amortization | 1,379 | 1,118
Other Intangible Assets [Member] |  |
Historical Cost | 1,560 | 1,557
Accumulated Amortization | 1,453 | 1,413
Total [Member] |  |
Historical Cost | 15,716 | 11,431
Accumulated Amortization | $ 4,414 | $ 3,542

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | grc_IntangibleAssetsAccumulatedAmortization
Namespace Prefix: | grc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
Name: | us-gaap_IntangibleAssetsNetIncludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant