2.2.0.25falsefalse0605 - Disclosure - Share-Based Compensation (Details)truefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $Jan-01-2010_Dec-31-2010http://www.sec.gov/CIK0000042542duration2010-01-01T00:00:002010-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2009 - 12/31/2009 USD ($) USD ($) / shares $TwelveMonthsEnded_31Dec2009http://www.sec.gov/CIK0000042542duration2009-01-01T00:00:002009-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$3falsefalseUSDfalsefalse1/1/2008 - 12/31/2008 USD ($) USD ($) / shares $TwelveMonthsEnded_31Dec2008http://www.sec.gov/CIK0000042542duration2008-01-01T00:00:002008-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3true0us-gaap_ShareBasedCompensationAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseCompensation cost for share-based compensation plans4false0us-gaap_ShareBasedCompensationus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse8140000081400000falsetruefalsefalsefalse2truefalsefalse6670000066700000falsetruefalsefalsefalse3truefalsefalse3640000036400000falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 falsefalseCompensation cost5false0gr_ShareBasedCompensationNetOfTaxgrfalsedebitdurationShare-based compensation net of tax.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse5240000052400000falsefalsefalsefalsefalse2truefalsefalse4320000043200000falsefalsefalsefalsefalse3truefalsefalse2390000023900000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryShare-based compensation net of tax.No authoritative reference available.falsefalseCompensation cost net of tax benefit6false0gr_ShareBaseCompensationCostPerDilutedShareNetOfTaxBenefitgrfalsenadurationShare base compensation cost per diluted share - net of tax benefit.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse0.410.41falsetruefalsefalsefalse2truefalsefalse0.350.35falsetruefalsefalsefalse3truefalsefalse0.190.19falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryShare base compensation cost per diluted share - net of tax benefit.No authoritative reference available.falsefalseCompensation cost per diluted share - net of tax benefit34Share-Based Compensation (Details) (USD $)NoRoundingUnKnownUnKnownUnKnownfalsetrue