2.4.0.8027 - Disclosure - Note 2 - Vessel Acquisitions and Dispositions (Details) - Vessels Addedtruefalsefalse1false falsefalsec38_From1Jan2013To30Jun2013_LgSPVMember_NorthSeaMember_HighlandDefenderMemberhttp://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-06-30T00:00:00hpStandardhttp://www.xbrl.org/2009/utrhputr0tStandardhttp://www.xbrl.org/2009/utrTutr0ftStandardhttp://www.xbrl.org/2009/utrftutr01false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse1false truefalsec38_From1Jan2013To30Jun2013_LgSPVMember_NorthSeaMember_HighlandDefenderMemberhttp://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseLgSPV [Member]us-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldiglf_LgSPVMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMemberfalsefalseHighland Defender [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiglf_HighlandDefenderMemberdei_LegalEntityAxisexplicitMemberfalsefalseNorth Sea [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldiglf_NorthSeaMemberus-gaap_StatementGeographicalAxisexplicitMemberhpStandardhttp://www.xbrl.org/2009/utrhputr0tStandardhttp://www.xbrl.org/2009/utrTutr0ftStandardhttp://www.xbrl.org/2009/utrftutr0nanafalse0LgSPV [Member] | Highland Defender [Member] | North Sea [Member]2true 3us-gaap_SignificantAcquisitionsAndDisposalsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Significant Acquisitions and Disposals [Line Items]3false 4glf_YearBuiltglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse002013falsefalsefalsexbrli:gYearItemTypepositiveintegerYear built.No definition available.false0Highland Defender4false 4glf_LengthOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse291291falsefalsefalsenum:lengthItemTypedecimalLength.No definition available.false256Highland Defender (in Feet)5false 4glf_BrakeHorsePowerOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse95749574[1]falsefalsefalsenum:powerItemTypedecimalBrake horse power of vessels.No definition available.false256Highland Defender (in Horsepower)6false 4glf_DeadweightTonsOfVesselsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse51005100[2]falsefalsefalsenum:weightItemTypedecimalDeadweight tons.No definition available.false256Highland Defender (in US Ton)7false 4glf_MonthDisposedglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Jul-13falsefalsefalsexbrli:stringItemTypestringMonth disposed.No definition available.false0Highland Defender1BHP - Brake Horsepower2DWT - Deadweight TonsfalseNote 2 - Vessel Acquisitions and Dispositions (Details) - Vessels Added (LgSPV [Member], Highland Defender [Member], North Sea [Member])UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.gulfmark.com/role/VesselsAddedTable17