2.2.0.25truefalse071 - Statement - Geographic Concentration Risk (Detail)truefalsefalse1falsefalsetruefalse{igt_GeographicConcentrationRiskAxis} : Nevada [Member] 9/30/2010 c204_AsOf30Sep2010_NevadaMemberhttp://www.sec.gov/CIK0000353944instant2010-09-30T00:00:000001-01-01T00:00:00falsefalseNevada [Member]igt_GeographicConcentrationRiskAxisxbrldihttp://xbrl.org/2006/xbrldiigt_NevadaMemberigt_GeographicConcentrationRiskAxisexplicitMemberratioStandardhttp://www.xbrl.org/2003/instancepurexbrli01false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/geographicconcentrationrisktable1falsefalsefalse00falsefalsefalsefalsefalse1falsefalsetruefalse{igt_GeographicConcentrationRiskAxis} : Nevada [Member] 9/30/2010 c204_AsOf30Sep2010_NevadaMemberhttp://www.sec.gov/CIK0000353944instant2010-09-30T00:00:000001-01-01T00:00:00falsefalseNevada [Member]igt_GeographicConcentrationRiskAxisxbrldihttp://xbrl.org/2006/xbrldiigt_NevadaMemberigt_GeographicConcentrationRiskAxisexplicitMemberratioStandardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseNevada [Member]2false0us-gaap_ConcentrationRiskPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.110.11falsefalsefalsefalsefalseOtherus-types:percentItemTypepureFor an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.No authoritative reference available.falsefalseConcentration Risk Percentage3false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/geographicconcentrationrisktable1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsetruefalse{igt_GeographicConcentrationRiskAxis} : Alabama [Member] 9/30/2010 c205_AsOf30Sep2010_AlabamaMemberhttp://www.sec.gov/CIK0000353944instant2010-09-30T00:00:000001-01-01T00:00:00falsefalseAlabama [Member]igt_GeographicConcentrationRiskAxisxbrldihttp://xbrl.org/2006/xbrldiigt_AlabamaMemberigt_GeographicConcentrationRiskAxisexplicitMemberratioStandardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseAlabama [Member]4false0us-gaap_ConcentrationRiskPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.050.05falsefalsefalsefalsefalseOtherus-types:percentItemTypepureFor an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.No authoritative reference available.falsefalseConcentration Risk Percentage5false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/geographicconcentrationrisktable1falsefalsefalse00falsefalsefalsefalsefalse3falsefalsetruefalse{igt_GeographicConcentrationRiskAxis} : Oklahoma [Member] 9/30/2010 c206_AsOf30Sep2010_OklahomaMemberhttp://www.sec.gov/CIK0000353944instant2010-09-30T00:00:000001-01-01T00:00:00falsefalseOklahoma [Member]igt_GeographicConcentrationRiskAxisxbrldihttp://xbrl.org/2006/xbrldiigt_OklahomaMemberigt_GeographicConcentrationRiskAxisexplicitMemberratioStandardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseOklahoma [Member]6false0us-gaap_ConcentrationRiskPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.050.05falsefalsefalsefalsefalseOtherus-types:percentItemTypepureFor an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.No authoritative reference available.falsefalseConcentration Risk Percentage7false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/geographicconcentrationrisktable1falsefalsefalse00falsefalsefalsefalsefalse4falsefalsetruefalse{igt_GeographicConcentrationRiskAxis} : Other North America [Member] 9/30/2010 c207_AsOf30Sep2010_OtherNorthAmericaMemberhttp://www.sec.gov/CIK0000353944instant2010-09-30T00:00:000001-01-01T00:00:00falsefalseOther North America [Member]igt_GeographicConcentrationRiskAxisxbrldihttp://xbrl.org/2006/xbrldiigt_OtherNorthAmericaMemberigt_GeographicConcentrationRiskAxisexplicitMemberratioStandardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseOther North America [Member]8false0us-gaap_ConcentrationRiskPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.290.29falsefalsefalsefalsefalseOtherus-types:percentItemTypepureFor an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.No authoritative reference available.falsefalseConcentration Risk Percentage9false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/geographicconcentrationrisktable1falsefalsefalse00falsefalsefalsefalsefalse5falsefalsetruefalse{igt_GeographicConcentrationRiskAxis} : North America [Member] 9/30/2010 c208_AsOf30Sep2010_NorthAmericaMemberhttp://www.sec.gov/CIK0000353944instant2010-09-30T00:00:000001-01-01T00:00:00falsefalseNorth America [Member]igt_GeographicConcentrationRiskAxisxbrldihttp://xbrl.org/2006/xbrldiigt_NorthAmericaMemberigt_GeographicConcentrationRiskAxisexplicitMemberratioStandardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseNorth America [Member]10false0us-gaap_ConcentrationRiskPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.500.50falsefalsefalsefalsefalseOtherus-types:percentItemTypepureFor an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.No authoritative reference available.falsefalseConcentration Risk Percentage11false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/geographicconcentrationrisktable1falsefalsefalse00falsefalsefalsefalsefalse6falsefalsetruefalse{igt_GeographicConcentrationRiskAxis} : Argentina [Member] 9/30/2010 c209_AsOf30Sep2010_ArgentinaMemberhttp://www.sec.gov/CIK0000353944instant2010-09-30T00:00:000001-01-01T00:00:00falsefalseArgentina [Member]igt_GeographicConcentrationRiskAxisxbrldihttp://xbrl.org/2006/xbrldiigt_ArgentinaMemberigt_GeographicConcentrationRiskAxisexplicitMemberratioStandardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseArgentina [Member]12false0us-gaap_ConcentrationRiskPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.240.24falsefalsefalsefalsefalseOtherus-types:percentItemTypepureFor an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.No authoritative reference available.falsefalseConcentration Risk Percentage13false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/geographicconcentrationrisktable1falsefalsefalse00falsefalsefalsefalsefalse7falsefalsetruefalse{igt_GeographicConcentrationRiskAxis} : Europe [Member] 9/30/2010 c210_AsOf30Sep2010_EuropeMemberhttp://www.sec.gov/CIK0000353944instant2010-09-30T00:00:000001-01-01T00:00:00falsefalseEurope [Member]igt_GeographicConcentrationRiskAxisxbrldihttp://xbrl.org/2006/xbrldiigt_EuropeMemberigt_GeographicConcentrationRiskAxisexplicitMemberratioStandardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseEurope [Member]14false0us-gaap_ConcentrationRiskPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.120.12falsefalsefalsefalsefalseOtherus-types:percentItemTypepureFor an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.No authoritative reference available.falsefalseConcentration Risk Percentage15false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/geographicconcentrationrisktable1falsefalsefalse00falsefalsefalsefalsefalse8falsefalsetruefalse{igt_GeographicConcentrationRiskAxis} : Other Latin America [Member] 9/30/2010 c211_AsOf30Sep2010_OtherLatinAmericaMemberhttp://www.sec.gov/CIK0000353944instant2010-09-30T00:00:000001-01-01T00:00:00falsefalseOther Latin America [Member]igt_GeographicConcentrationRiskAxisxbrldihttp://xbrl.org/2006/xbrldiigt_OtherLatinAmericaMemberigt_GeographicConcentrationRiskAxisexplicitMemberratioStandardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseOther Latin America [Member]16false0us-gaap_ConcentrationRiskPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.070.07falsefalsefalsefalsefalseOtherus-types:percentItemTypepureFor an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.No authoritative reference available.falsefalseConcentration Risk Percentage17false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/geographicconcentrationrisktable1falsefalsefalse00falsefalsefalsefalsefalse9falsefalsetruefalse{igt_GeographicConcentrationRiskAxis} : Other International [Member] 9/30/2010 c212_AsOf30Sep2010_OtherInternationalMemberhttp://www.sec.gov/CIK0000353944instant2010-09-30T00:00:000001-01-01T00:00:00falsefalseOther International [Member]igt_GeographicConcentrationRiskAxisxbrldihttp://xbrl.org/2006/xbrldiigt_OtherInternationalMemberigt_GeographicConcentrationRiskAxisexplicitMemberratioStandardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseOther International [Member]18false0us-gaap_ConcentrationRiskPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.070.07falsefalsefalsefalsefalseOtherus-types:percentItemTypepureFor an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.No authoritative reference available.falsefalseConcentration Risk Percentage19false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/geographicconcentrationrisktable1falsefalsefalse00falsefalsefalsefalsefalse10falsefalsetruefalse{igt_GeographicConcentrationRiskAxis} : International [Member] 9/30/2010 c213_AsOf30Sep2010_InternationalMemberhttp://www.sec.gov/CIK0000353944instant2010-09-30T00:00:000001-01-01T00:00:00falsefalseInternational [Member]igt_GeographicConcentrationRiskAxisxbrldihttp://xbrl.org/2006/xbrldiigt_InternationalMemberigt_GeographicConcentrationRiskAxisexplicitMemberratioStandardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseInternational [Member]20false0us-gaap_ConcentrationRiskPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.500.50falsefalsefalsefalsefalseOtherus-types:percentItemTypepureFor an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.No authoritative reference available.falsefalseConcentration Risk Percentage120Geographic Concentration Risk (Detail)UnKnownUnKnownUnKnownUnKnowntruetrue