XML 67 R49.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Note I - Business Segment Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Note I - Business Segment Information (Details) [Line Items] |  |
Number of Reportable Segments | 1 |
Number of Countries in which Entity Operates | 120 |
UNITED STATES |  |
Note I - Business Segment Information (Details) [Line Items] |  |
Long-Lived Assets, Percent | 99.00% | 98.00%

X
- Definition Percentage of long-lived assets. + References No definition available. + Details
Name: | grc_LongLivedAssetsPercent
Namespace Prefix: | grc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | grc_NoteIBusinessSegmentInformationDetailsLineItems
Namespace Prefix: | grc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of countries in which the entity operates as of balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration