2.2.0.25truefalse0615 - Disclosure - (Gain)/Loss on Asset Disposal/Involuntary Conversion, Net (Details Textuals)truefalseIn Thousands, unless otherwise specifiedfalse1falsefalseUSDfalsefalse3/1/2009 - 3/31/2009 USD ($) $OneMonthEnded_31Mar2009http://www.sec.gov/CIK0001458891duration2009-03-01T00:00:002009-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2falsefalseUSDfalsefalse4/1/2009 - 6/30/2009 USD ($) / shares USD ($) $ThreeMonthsEnded_30Jun2009http://www.sec.gov/CIK0001458891duration2009-04-01T00:00:002009-06-30T00:00:00USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3falsefalseUSDfalsefalse7/1/2008 - 9/30/2008 USD ($) $ThreeMonthsEnded_30Sep2008http://www.sec.gov/CIK0001458891duration2008-07-01T00:00:002008-09-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4falsefalseUSDfalsefalse4/1/2008 - 6/30/2008 USD ($) $ThreeMonthsEnded_30Jun2008http://www.sec.gov/CIK0001458891duration2008-04-01T00:00:002008-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$5falsefalseUSDfalsefalse1/1/2009 - 12/31/2009 USD ($) USD ($) / shares $TwelveMonthsEnded_31Dec2009http://www.sec.gov/CIK0001458891duration2009-01-01T00:00:002009-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$6falsefalseUSDfalsefalse1/1/2008 - 12/31/2008 USD ($) USD ($) / shares $TwelveMonthsEnded_31Dec2008http://www.sec.gov/CIK0001458891duration2008-01-01T00:00:002008-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$7falsefalseUSDtruefalse{us-gaap_PropertyPlantAndEquipmentByTypeAxis} : Damaged Legs [Member] 4/1/2009 - 6/30/2009 USD ($) $ThreeMonthsEnded_30Jun2009_Damaged_Legs_Memberhttp://www.sec.gov/CIK0001458891duration2009-04-01T00:00:002009-06-30T00:00:00falsefalseDamaged Legs [Member]us-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldine_DamagedLegsMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8falsefalseUSDtruefalse{us-gaap_PropertyPlantAndEquipmentByTypeAxis} : Rigs Operating in Us Gulf of Mexico [Member] 10/31/2010 USD ($) $BalanceAsOf_30Sep2008_Rigs_Operating_In_Us_Gulf_Of_Mexico_Memberhttp://www.sec.gov/CIK0001458891instant2010-10-31T00:00:000001-01-01T00:00:00falsefalseRigs Operating in Us Gulf of Mexico [Member]us-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldine_RigsOperatingInUsGulfOfMexicoMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2true0ne_GainLossOnAssetDisposalInvoluntaryConversionNetTextualsAbstractnefalsenadurationGain loss on asset disposal involuntary conversion net.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringGain loss on asset disposal involuntary conversion net.falsefalse(Gain)/ loss on asset disposal/ involuntary conversion, net (Textuals) [Abstract]3false0us-gaap_AssetImpairmentChargesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1200000012000falsetruefalsefalsefalse2truefalsefalse1700000017000falsetruefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5truefalsefalse3083900030839falsetruefalsefalsefalse6truefalsefalse-26485000-26485falsetruefalsefalsefalse7truefalsefalse90000009000falsetruefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 falsefalseInvoluntary conversion charges4false0ne_AggregateInsuranceLimitAvailablenefalsedebitinstantAggregate insurance limit available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsetruefalse8truefalsefalse200000000200000falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate insurance limit available.No authoritative reference available.falsefalseAggregate Insurance limit available5false0ne_InsuranceClaimDeductibleExpensenefalsedebitdurationInsurance claim deductible expense.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse1000000010000falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryInsurance claim deductible expense.No authoritative reference available.falsefalseDeduction in the existing insurance program6false0us-gaap_ProceedsFromDivestitureOfBusinessesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse3500000035000falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 16 falsefalseSales of business7false0ne_LaborContractsForPlatformOperationsInSaleOfBusinessUnitnefalsenadurationLabor contracts for platform operations in the sale of business unit.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse1111falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:integerItemTypeintegerLabor contracts for platform operations in the sale of business unit.No authoritative reference available.falsefalseLabor contracts for platform operations in the sale of business unit8false0us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposalus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse3600000036000falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 37, 45 falsefalseGain on sale of business9false0us-gaap_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTranslationGainsLossesus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse50000005000falsetruefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of foreign currency translation gains (losses) included in the disposal group, whether or not a component of the entity (discontinued operation), that were previously reported in accumulated other comprehensive income (loss).No authoritative reference available.falsefalseGain on sale of business included in cumulative currency translation adjustment88(Gain)/Loss on Asset Disposal/Involuntary Conversion, Net (Details Textuals) (USD $)ThousandsUnKnownUnKnownUnKnowntruetrue