2.2.0.25falsefalse40301 - Disclosure - Available-For-Sale Securities (Narrative) (Details)truefalsefalse1falsefalseUSDfalsefalse12/31/2010
USD ($)
USD ($) / shares
$As_Of_12_31_2010http://www.sec.gov/CIK0000882095instant2010-12-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2falsefalseUSDfalsefalse12/31/2009
USD ($)
USD ($) / shares
$As_Of_12_31_2009http://www.sec.gov/CIK0000882095instant2009-12-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$5false0gild_NumberOfSecuritiesInUnrealizedLossPositionPercentageOfTotalTextBlockgildfalsenainstantNumber Of Securities In An Unrealized Loss Position Percentage Of Total [Text Block]falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse0.340.34falsefalsefalsefalsefalse2truetruefalse0.320.32falsefalsefalsefalsefalseOtherus-types:percentItemTypepureNumber Of Securities In An Unrealized Loss Position Percentage Of Total [Text Block]No authoritative reference available.falsefalse21Available-For-Sale Securities (Narrative) (Details)UnKnownUnKnownUnKnownUnKnowntruetrue
