2.4.0.8035 - Disclosure - Note 5 - Stockholders' Equity (Details) - Repurchase of Equity Securitiestruefalsefalse1false falsefalsec75_From1Jun2013To30Jun2013http://www.sec.gov/CIK0001030749duration2013-06-01T00:00:002013-06-30T00:00:00sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli02false falsefalsec74_From1May2013To31May2013http://www.sec.gov/CIK0001030749duration2013-05-01T00:00:002013-05-31T00:00:00sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli03false falsefalsec73_From1Apr2013To30Apr2013http://www.sec.gov/CIK0001030749duration2013-04-01T00:00:002013-04-30T00:00:00sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli04false USDfalsefalse$c72_From1Mar2013To31Mar2013http://www.sec.gov/CIK0001030749duration2013-03-01T00:00:002013-03-31T00:00:00sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0usdPersharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$5false USDfalsefalse$c71_From1Feb2013To28Feb2013http://www.sec.gov/CIK0001030749duration2013-02-01T00:00:002013-02-28T00:00:00sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0usdPersharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$6false USDfalsefalse$c31_From1Jan2013To31Jan2013http://www.sec.gov/CIK0001030749duration2013-01-01T00:00:002013-01-31T00:00:00sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0usdPersharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$1true 1glf_RepurchaseOfEquitySecuritiesAbstractglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Repurchase of Equity Securities [Abstract]2false 2us-gaap_StockRepurchasedDuringPeriodSharesus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse2000020000falsefalsefalse5truefalsefalse102473102473falsefalsefalse6truefalsefalse215746215746falsefalsefalsexbrli:sharesItemTypesharesNumber of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 false1Total Number of Common Shares Repurchased3false 2us-gaap_TreasuryStockAcquiredAverageCostPerShareus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse35.2735.27USD$falsetruefalse5truefalsefalse37.7337.73USD$falsetruefalse6truefalsefalse34.6534.65USD$falsetruefalsenum:perShareItemTypedecimalTotal cost of shares repurchased divided by the total number of shares repurchased.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 false3Average Price Paid Per Common Share (in Dollars per share)4false 2glf_StockRepurchasedDuringPeriodSharesAsPartOfPubliclyAnnouncedPlansOrProgramsglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse373619373619falsefalsefalse5truefalsefalse353619353619falsefalsefalse6truefalsefalse251146251146falsefalsefalsexbrli:sharesItemTypesharesNo authoritative reference available.No definition available.false1Total Number of Common Shares Purchased as Part of Publicly Announced Plans or Programs5false 2glf_MaximumNumberOfCommonStockSharesToBePurchasedglf_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse8674586745falsefalsefalse2truefalsefalse8674586745falsefalsefalse3truefalsefalse8674586745falsefalsefalse4truefalsefalse8674586745falsefalsefalse5truefalsefalse8745087450falsefalsefalse6truefalsefalse9131991319falsefalsefalsexbrli:sharesItemTypesharesNo authoritative reference available.No definition available.false1Maximum Number (or Approximate Dollar Value) of Common Shares that May Yet Be Purchased Under the Plans or ProgramsfalseNote 5 - Stockholders' Equity (Details) - Repurchase of Equity Securities (USD $)UnKnownNoRoundingNoRoundingUnKnowntruefalsefalseSheethttp://www.gulfmark.com/role/RepurchaseofEquitySecuritiesTable65