2.4.0.8028 - Disclosure - Note 2 - Vessel Acquisitions and Dispositions (Details) - New Build ProgramtruefalseIn Millions, unless otherwise specifiedfalse1false USDfalsefalse$c39_From1Jan2013To30Jun2013_RemontowaMember_LargePlatformSupplyVesselTwoMember_NorthSeaMemberhttp://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-06-30T00:00:00ftStandardhttp://www.xbrl.org/2009/utrftutr0tStandardhttp://www.xbrl.org/2009/utrTutr0hpStandardhttp://www.xbrl.org/2009/utrhputr0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse1false USDtruefalse$c39_From1Jan2013To30Jun2013_RemontowaMember_LargePlatformSupplyVesselTwoMember_NorthSeaMemberhttp://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseRemontowa [Member]glf_ConstructionyardAxisxbrldihttp://xbrl.org/2006/xbrldiglf_RemontowaMemberglf_ConstructionyardAxisexplicitMemberfalsefalseNorth Sea [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldiglf_NorthSeaMemberus-gaap_StatementGeographicalAxisexplicitMemberfalsefalseLarge Platform Supply Vessel Two [Member]glf_VesselTypeAxisxbrldihttp://xbrl.org/2006/xbrldiglf_LargePlatformSupplyVesselTwoMemberglf_VesselTypeAxisexplicitMemberftStandardhttp://www.xbrl.org/2009/utrftutr0tStandardhttp://www.xbrl.org/2009/utrTutr0hpStandardhttp://www.xbrl.org/2009/utrhputr0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Remontowa [Member] | North Sea [Member] | Large Platform Supply Vessel Two [Member]2true 3glf_Note2VesselAcquisitionsandDispositionsDetailsNewBuildProgramLineItemsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 2 - Vessel Acquisitions and Dispositions (Details) - New Build Program [Line Items]3false 4glf_ExpectedDeliveryOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Q3 2013falsefalsefalseus-types:dateStringItemTypenormalizedstringExpected delivery.No definition available.false0Expected Delivery4false 4glf_LengthOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse291291falsefalsefalsenum:lengthItemTypedecimalLength.No definition available.false256Length (feet) (in Feet)5false 4glf_BrakeHorsePowerOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse95749574[1]falsefalsefalsenum:powerItemTypedecimalBrake horse power of vessels.No definition available.false256BHP (in Horsepower)6false 4glf_DeadweightTonsOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse51005100[2]falsefalsefalsenum:weightItemTypedecimalDeadweight tons.No definition available.false256DWT (in US Ton)7false 4glf_ExpectedCostOfVesselsglf_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse3700000037.0USD$falsetruefalsexbrli:monetaryItemTypemonetaryExpected cost.No definition available.false2Expected Cost (in Dollars)8false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2false USDtruefalse$c40_From1Jan2013To30Jun2013_RemontowaMember_LargePlatformSupplyVesselThreeMember_NorthSeaMemberhttp://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseRemontowa [Member]glf_ConstructionyardAxisxbrldihttp://xbrl.org/2006/xbrldiglf_RemontowaMemberglf_ConstructionyardAxisexplicitMemberfalsefalseNorth Sea [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldiglf_NorthSeaMemberus-gaap_StatementGeographicalAxisexplicitMemberfalsefalseLarge Platform Supply Vessel Three [Member]glf_VesselTypeAxisxbrldihttp://xbrl.org/2006/xbrldiglf_LargePlatformSupplyVesselThreeMemberglf_VesselTypeAxisexplicitMemberhpStandardhttp://www.xbrl.org/2009/utrhputr0tStandardhttp://www.xbrl.org/2009/utrTutr0ftStandardhttp://www.xbrl.org/2009/utrftutr0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Remontowa [Member] | North Sea [Member] | Large Platform Supply Vessel Three [Member]9true 3glf_Note2VesselAcquisitionsandDispositionsDetailsNewBuildProgramLineItemsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 2 - Vessel Acquisitions and Dispositions (Details) - New Build Program [Line Items]10false 4glf_ExpectedDeliveryOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Q3 2013falsefalsefalseus-types:dateStringItemTypenormalizedstringExpected delivery.No definition available.false0Expected Delivery11false 4glf_LengthOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse260260falsefalsefalsenum:lengthItemTypedecimalLength.No definition available.false256Length (feet) (in Feet)12false 4glf_BrakeHorsePowerOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse95749574[1]falsefalsefalsenum:powerItemTypedecimalBrake horse power of vessels.No definition available.false256BHP (in Horsepower)13false 4glf_DeadweightTonsOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse40004000[2]falsefalsefalsenum:weightItemTypedecimalDeadweight tons.No definition available.false256DWT (in US Ton)14false 4glf_ExpectedCostOfVesselsglf_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse3400000034.0USD$falsefalsefalsexbrli:monetaryItemTypemonetaryExpected cost.No definition available.false2Expected Cost (in Dollars)15false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse3false USDtruefalse$c41_From1Jan2013To30Jun2013_RosettiMarinoMember_LargePlatformSupplyVesselFourMember_NorthSeaMemberhttp://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseRosetti Marino [Member]glf_ConstructionyardAxisxbrldihttp://xbrl.org/2006/xbrldiglf_RosettiMarinoMemberglf_ConstructionyardAxisexplicitMemberfalsefalseNorth Sea [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldiglf_NorthSeaMemberus-gaap_StatementGeographicalAxisexplicitMemberfalsefalseLarge Platform Supply Vessel Four [Member]glf_VesselTypeAxisxbrldihttp://xbrl.org/2006/xbrldiglf_LargePlatformSupplyVesselFourMemberglf_VesselTypeAxisexplicitMemberftStandardhttp://www.xbrl.org/2009/utrftutr0hpStandardhttp://www.xbrl.org/2009/utrhputr0tStandardhttp://www.xbrl.org/2009/utrTutr0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Rosetti Marino [Member] | North Sea [Member] | Large Platform Supply Vessel Four [Member]16true 3glf_Note2VesselAcquisitionsandDispositionsDetailsNewBuildProgramLineItemsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 2 - Vessel Acquisitions and Dispositions (Details) - New Build Program [Line Items]17false 4glf_ExpectedDeliveryOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Q4 2013falsefalsefalseus-types:dateStringItemTypenormalizedstringExpected delivery.No definition available.false0Expected Delivery18false 4glf_LengthOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse246246falsefalsefalsenum:lengthItemTypedecimalLength.No definition available.false256Length (feet) (in Feet)19false 4glf_BrakeHorsePowerOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse84578457[1]falsefalsefalsenum:powerItemTypedecimalBrake horse power of vessels.No definition available.false256BHP (in Horsepower)20false 4glf_DeadweightTonsOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse30003000[2]falsefalsefalsenum:weightItemTypedecimalDeadweight tons.No definition available.false256DWT (in US Ton)21false 4glf_ExpectedCostOfVesselsglf_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse3100000031.0USD$falsefalsefalsexbrli:monetaryItemTypemonetaryExpected cost.No definition available.false2Expected Cost (in Dollars)22false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse4false USDtruefalse$c42_From1Jan2013To30Jun2013_RosettiMarinoMember_LargePlatformSupplyVesselFiveMember_NorthSeaMemberhttp://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseRosetti Marino [Member]glf_ConstructionyardAxisxbrldihttp://xbrl.org/2006/xbrldiglf_RosettiMarinoMemberglf_ConstructionyardAxisexplicitMemberfalsefalseNorth Sea [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldiglf_NorthSeaMemberus-gaap_StatementGeographicalAxisexplicitMemberfalsefalseLarge Platform Supply Vessel Five [Member]glf_VesselTypeAxisxbrldihttp://xbrl.org/2006/xbrldiglf_LargePlatformSupplyVesselFiveMemberglf_VesselTypeAxisexplicitMembertStandardhttp://www.xbrl.org/2009/utrTutr0hpStandardhttp://www.xbrl.org/2009/utrhputr0ftStandardhttp://www.xbrl.org/2009/utrftutr0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Rosetti Marino [Member] | North Sea [Member] | Large Platform Supply Vessel Five [Member]23true 3glf_Note2VesselAcquisitionsandDispositionsDetailsNewBuildProgramLineItemsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 2 - Vessel Acquisitions and Dispositions (Details) - New Build Program [Line Items]24false 4glf_ExpectedDeliveryOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Q1 2014falsefalsefalseus-types:dateStringItemTypenormalizedstringExpected delivery.No definition available.false0Expected Delivery25false 4glf_LengthOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse246246falsefalsefalsenum:lengthItemTypedecimalLength.No definition available.false256Length (feet) (in Feet)26false 4glf_BrakeHorsePowerOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse84578457[1]falsefalsefalsenum:powerItemTypedecimalBrake horse power of vessels.No definition available.false256BHP (in Horsepower)27false 4glf_DeadweightTonsOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse30003000[2]falsefalsefalsenum:weightItemTypedecimalDeadweight tons.No definition available.false256DWT (in US Ton)28false 4glf_ExpectedCostOfVesselsglf_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse3100000031.0USD$falsefalsefalsexbrli:monetaryItemTypemonetaryExpected cost.No definition available.false2Expected Cost (in Dollars)29false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse5false USDtruefalse$c43_From1Jan2013To30Jun2013_SimekMember_LargePlatformSupplyVesselSixMember_NorthSeaMemberhttp://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseSimek [Member]glf_ConstructionyardAxisxbrldihttp://xbrl.org/2006/xbrldiglf_SimekMemberglf_ConstructionyardAxisexplicitMemberfalsefalseNorth Sea [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldiglf_NorthSeaMemberus-gaap_StatementGeographicalAxisexplicitMemberfalsefalseLarge Platform Supply Vessel Six [Member]glf_VesselTypeAxisxbrldihttp://xbrl.org/2006/xbrldiglf_LargePlatformSupplyVesselSixMemberglf_VesselTypeAxisexplicitMembertStandardhttp://www.xbrl.org/2009/utrTutr0hpStandardhttp://www.xbrl.org/2009/utrhputr0ftStandardhttp://www.xbrl.org/2009/utrftutr0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Simek [Member] | North Sea [Member] | Large Platform Supply Vessel Six [Member]30true 3glf_Note2VesselAcquisitionsandDispositionsDetailsNewBuildProgramLineItemsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 2 - Vessel Acquisitions and Dispositions (Details) - New Build Program [Line Items]31false 4glf_ExpectedDeliveryOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Q3 2013falsefalsefalseus-types:dateStringItemTypenormalizedstringExpected delivery.No definition available.false0Expected Delivery32false 4glf_LengthOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse304304falsefalsefalsenum:lengthItemTypedecimalLength.No definition available.false256Length (feet) (in Feet)33false 4glf_BrakeHorsePowerOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse1193511935[1]falsefalsefalsenum:powerItemTypedecimalBrake horse power of vessels.No definition available.false256BHP (in Horsepower)34false 4glf_DeadweightTonsOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse47004700[2]falsefalsefalsenum:weightItemTypedecimalDeadweight tons.No definition available.false256DWT (in US Ton)35false 4glf_ExpectedCostOfVesselsglf_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse5800000058.0USD$falsefalsefalsexbrli:monetaryItemTypemonetaryExpected cost.No definition available.false2Expected Cost (in Dollars)36false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse6false USDtruefalse$c44_From1Jan2013To30Jun2013_SimekMember_LargePlatformSupplyVesselSevenMember_NorthSeaMemberhttp://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseSimek [Member]glf_ConstructionyardAxisxbrldihttp://xbrl.org/2006/xbrldiglf_SimekMemberglf_ConstructionyardAxisexplicitMemberfalsefalseNorth Sea [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldiglf_NorthSeaMemberus-gaap_StatementGeographicalAxisexplicitMemberfalsefalseLarge Platform Supply Vessel Seven [Member]glf_VesselTypeAxisxbrldihttp://xbrl.org/2006/xbrldiglf_LargePlatformSupplyVesselSevenMemberglf_VesselTypeAxisexplicitMemberftStandardhttp://www.xbrl.org/2009/utrftutr0tStandardhttp://www.xbrl.org/2009/utrTutr0hpStandardhttp://www.xbrl.org/2009/utrhputr0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Simek [Member] | North Sea [Member] | Large Platform Supply Vessel Seven [Member]37true 3glf_Note2VesselAcquisitionsandDispositionsDetailsNewBuildProgramLineItemsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 2 - Vessel Acquisitions and Dispositions (Details) - New Build Program [Line Items]38false 4glf_ExpectedDeliveryOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Q1 2014falsefalsefalseus-types:dateStringItemTypenormalizedstringExpected delivery.No definition available.false0Expected Delivery39false 4glf_LengthOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse304304falsefalsefalsenum:lengthItemTypedecimalLength.No definition available.false256Length (feet) (in Feet)40false 4glf_BrakeHorsePowerOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse1193511935[1]falsefalsefalsenum:powerItemTypedecimalBrake horse power of vessels.No definition available.false256BHP (in Horsepower)41false 4glf_DeadweightTonsOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse47004700[2]falsefalsefalsenum:weightItemTypedecimalDeadweight tons.No definition available.false256DWT (in US Ton)42false 4glf_ExpectedCostOfVesselsglf_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse6000000060.0USD$falsefalsefalsexbrli:monetaryItemTypemonetaryExpected cost.No definition available.false2Expected Cost (in Dollars)43false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse7false USDtruefalse$c45_From1Jan2013To30Jun2013_ThomaSeaMember_LargePlatformSupplyVesselNineMember_AmericasMemberhttp://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseThoma Sea [Member]glf_ConstructionyardAxisxbrldihttp://xbrl.org/2006/xbrldiglf_ThomaSeaMemberglf_ConstructionyardAxisexplicitMemberfalsefalseAmericas [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AmericasMemberus-gaap_StatementGeographicalAxisexplicitMemberfalsefalseLarge Platform Supply Vessel Nine [Member]glf_VesselTypeAxisxbrldihttp://xbrl.org/2006/xbrldiglf_LargePlatformSupplyVesselNineMemberglf_VesselTypeAxisexplicitMemberftStandardhttp://www.xbrl.org/2009/utrftutr0hpStandardhttp://www.xbrl.org/2009/utrhputr0tStandardhttp://www.xbrl.org/2009/utrTutr0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Thoma Sea [Member] | Americas [Member] | Large Platform Supply Vessel Nine [Member]44true 3glf_Note2VesselAcquisitionsandDispositionsDetailsNewBuildProgramLineItemsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 2 - Vessel Acquisitions and Dispositions (Details) - New Build Program [Line Items]45false 4glf_ExpectedDeliveryOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Q4 2013falsefalsefalseus-types:dateStringItemTypenormalizedstringExpected delivery.No definition available.false0Expected Delivery46false 4glf_LengthOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse271271falsefalsefalsenum:lengthItemTypedecimalLength.No definition available.false256Length (feet) (in Feet)47false 4glf_BrakeHorsePowerOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse99909990[1]falsefalsefalsenum:powerItemTypedecimalBrake horse power of vessels.No definition available.false256BHP (in Horsepower)48false 4glf_DeadweightTonsOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse36003600[2]falsefalsefalsenum:weightItemTypedecimalDeadweight tons.No definition available.false256DWT (in US Ton)49false 4glf_ExpectedCostOfVesselsglf_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse3600000036.0USD$falsefalsefalsexbrli:monetaryItemTypemonetaryExpected cost.No definition available.false2Expected Cost (in Dollars)50false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse8false USDtruefalse$c46_From1Jan2013To30Jun2013_ThomaSeaMember_LargePlatformSupplyVesselEightMember_AmericasMemberhttp://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseThoma Sea [Member]glf_ConstructionyardAxisxbrldihttp://xbrl.org/2006/xbrldiglf_ThomaSeaMemberglf_ConstructionyardAxisexplicitMemberfalsefalseAmericas [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AmericasMemberus-gaap_StatementGeographicalAxisexplicitMemberfalsefalseLarge Platform Supply Vessel Eight [Member]glf_VesselTypeAxisxbrldihttp://xbrl.org/2006/xbrldiglf_LargePlatformSupplyVesselEightMemberglf_VesselTypeAxisexplicitMemberftStandardhttp://www.xbrl.org/2009/utrftutr0tStandardhttp://www.xbrl.org/2009/utrTutr0hpStandardhttp://www.xbrl.org/2009/utrhputr0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Thoma Sea [Member] | Americas [Member] | Large Platform Supply Vessel Eight [Member]51true 3glf_Note2VesselAcquisitionsandDispositionsDetailsNewBuildProgramLineItemsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 2 - Vessel Acquisitions and Dispositions (Details) - New Build Program [Line Items]52false 4glf_ExpectedDeliveryOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Q1 2014falsefalsefalseus-types:dateStringItemTypenormalizedstringExpected delivery.No definition available.false0Expected Delivery53false 4glf_LengthOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse271271falsefalsefalsenum:lengthItemTypedecimalLength.No definition available.false256Length (feet) (in Feet)54false 4glf_BrakeHorsePowerOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse99909990[1]falsefalsefalsenum:powerItemTypedecimalBrake horse power of vessels.No definition available.false256BHP (in Horsepower)55false 4glf_DeadweightTonsOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse36003600[2]falsefalsefalsenum:weightItemTypedecimalDeadweight tons.No definition available.false256DWT (in US Ton)56false 4glf_ExpectedCostOfVesselsglf_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse3600000036.0USD$falsefalsefalsexbrli:monetaryItemTypemonetaryExpected cost.No definition available.false2Expected Cost (in Dollars)57false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse9false USDtruefalse$c47_From1Jan2013To30Jun2013_BaeSystemsMember_LargePlatformSupplyVesselTenMember_AmericasMemberhttp://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseBae Systems [Member]glf_ConstructionyardAxisxbrldihttp://xbrl.org/2006/xbrldiglf_BaeSystemsMemberglf_ConstructionyardAxisexplicitMemberfalsefalseAmericas [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AmericasMemberus-gaap_StatementGeographicalAxisexplicitMemberfalsefalseLarge Platform Supply Vessel Ten [Member]glf_VesselTypeAxisxbrldihttp://xbrl.org/2006/xbrldiglf_LargePlatformSupplyVesselTenMemberglf_VesselTypeAxisexplicitMembertStandardhttp://www.xbrl.org/2009/utrTutr0ftStandardhttp://www.xbrl.org/2009/utrftutr0hpStandardhttp://www.xbrl.org/2009/utrhputr0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Bae Systems [Member] | Americas [Member] | Large Platform Supply Vessel Ten [Member]58true 3glf_Note2VesselAcquisitionsandDispositionsDetailsNewBuildProgramLineItemsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 2 - Vessel Acquisitions and Dispositions (Details) - New Build Program [Line Items]59false 4glf_ExpectedDeliveryOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Q3 2014falsefalsefalseus-types:dateStringItemTypenormalizedstringExpected delivery.No definition available.false0Expected Delivery60false 4glf_LengthOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse286286falsefalsefalsenum:lengthItemTypedecimalLength.No definition available.false256Length (feet) (in Feet)61false 4glf_BrakeHorsePowerOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse1096010960[1]falsefalsefalsenum:powerItemTypedecimalBrake horse power of vessels.No definition available.false256BHP (in Horsepower)62false 4glf_DeadweightTonsOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse53005300[2]falsefalsefalsenum:weightItemTypedecimalDeadweight tons.No definition available.false256DWT (in US Ton)63false 4glf_ExpectedCostOfVesselsglf_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse4800000048.0USD$falsefalsefalsexbrli:monetaryItemTypemonetaryExpected cost.No definition available.false2Expected Cost (in Dollars)64false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse10false USDtruefalse$c48_From1Jan2013To30Jun2013_BaeSystemsMember_LargePlatformSupplyVesselElevenMember_AmericasMemberhttp://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseBae Systems [Member]glf_ConstructionyardAxisxbrldihttp://xbrl.org/2006/xbrldiglf_BaeSystemsMemberglf_ConstructionyardAxisexplicitMemberfalsefalseAmericas [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AmericasMemberus-gaap_StatementGeographicalAxisexplicitMemberfalsefalseLarge Platform Supply Vessel Eleven [Member]glf_VesselTypeAxisxbrldihttp://xbrl.org/2006/xbrldiglf_LargePlatformSupplyVesselElevenMemberglf_VesselTypeAxisexplicitMembertStandardhttp://www.xbrl.org/2009/utrTutr0ftStandardhttp://www.xbrl.org/2009/utrftutr0hpStandardhttp://www.xbrl.org/2009/utrhputr0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Bae Systems [Member] | Americas [Member] | Large Platform Supply Vessel Eleven [Member]65true 3glf_Note2VesselAcquisitionsandDispositionsDetailsNewBuildProgramLineItemsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 2 - Vessel Acquisitions and Dispositions (Details) - New Build Program [Line Items]66false 4glf_ExpectedDeliveryOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Q1 2015falsefalsefalseus-types:dateStringItemTypenormalizedstringExpected delivery.No definition available.false0Expected Delivery67false 4glf_LengthOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse286286falsefalsefalsenum:lengthItemTypedecimalLength.No definition available.false256Length (feet) (in Feet)68false 4glf_BrakeHorsePowerOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse1096010960[1]falsefalsefalsenum:powerItemTypedecimalBrake horse power of vessels.No definition available.false256BHP (in Horsepower)69false 4glf_DeadweightTonsOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse53005300[2]falsefalsefalsenum:weightItemTypedecimalDeadweight tons.No definition available.false256DWT (in US Ton)70false 4glf_ExpectedCostOfVesselsglf_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse4800000048.0USD$falsetruefalsexbrli:monetaryItemTypemonetaryExpected cost.No definition available.false2Expected Cost (in Dollars)1BHP - Brake Horsepower2DWT - Deadweight TonsfalseNote 2 - Vessel Acquisitions and Dispositions (Details) - New Build Program (USD $)HundredThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.gulfmark.com/role/NewBuildProgramTable170