2.2.0.7 true Employee Benefit Plans (Details) (USD $) 0608 - Disclosure - Employee Benefit Plans (Details) true false In Thousands false false 1 USD true false false false Defined Contribution Pension [Member] us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_DefinedContributionPensionMember us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 2 USD true false false false Defined Contribution Pension [Member] us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_DefinedContributionPensionMember us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 3 USD true false false false Restoration Plan [Member] us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis xbrldi http://xbrl.org/2006/xbrldi ne_RestorationPlanMember us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 4 USD true false false false Restoration Plan [Member] us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis xbrldi http://xbrl.org/2006/xbrldi ne_RestorationPlanMember us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 5 USD true false false false U.S. [Member] us-gaap_StatementGeographicalAxis xbrldi http://xbrl.org/2006/xbrldi ne_UsMember us-gaap_StatementGeographicalAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 6 USD true false false false U.S. [Member] us-gaap_StatementGeographicalAxis xbrldi http://xbrl.org/2006/xbrldi ne_UsMember us-gaap_StatementGeographicalAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false U.S. [Member] us-gaap_StatementGeographicalAxis xbrldi http://xbrl.org/2006/xbrldi ne_UsMember us-gaap_StatementGeographicalAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 8 USD true false false false U.S. [Member] us-gaap_StatementGeographicalAxis xbrldi http://xbrl.org/2006/xbrldi ne_UsMember us-gaap_StatementGeographicalAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 9 USD true false false false Non-U.S. [Member] us-gaap_StatementGeographicalAxis xbrldi http://xbrl.org/2006/xbrldi ne_NonUsMember us-gaap_StatementGeographicalAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 10 USD true false false false Non-U.S. [Member] us-gaap_StatementGeographicalAxis xbrldi http://xbrl.org/2006/xbrldi ne_NonUsMember us-gaap_StatementGeographicalAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 11 USD true false false false Non-U.S. [Member] us-gaap_StatementGeographicalAxis xbrldi http://xbrl.org/2006/xbrldi ne_NonUsMember us-gaap_StatementGeographicalAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 12 USD true false false false Non-U.S. [Member] us-gaap_StatementGeographicalAxis xbrldi http://xbrl.org/2006/xbrldi ne_NonUsMember us-gaap_StatementGeographicalAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 5 Pension Costs 3 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:stringItemType string No definition available. false 6 Service cost 4 us-gaap_DefinedBenefitPlanServiceCost us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 true true false false 1912000 1912 true false false 6 true true false false 1803000 1803 true false false 7 true true false false 3824000 3824 true false false 8 true true false false 3606000 3606 true false false 9 true true false false 1050000 1050 true false false 10 true true false false 757000 757 true false false 11 true true false false 2166000 2166 true false false 12 true true false false 1505000 1505 true false false xbrli:monetaryItemType monetary The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a, h false 7 Interest cost 4 us-gaap_DefinedBenefitPlanInterestCost us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false true false false 1957000 1957 true false false 6 false true false false 1713000 1713 true false false 7 false true false false 3914000 3914 true false false 8 false true false false 3426000 3426 true false false 9 false true false false 1204000 1204 true false false 10 false true false false 1063000 1063 true false false 11 false true false false 2470000 2470 true false false 12 false true false false 2085000 2085 true false false xbrli:monetaryItemType monetary The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a, h false 8 Return on plan assets 4 us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false true false false -2392000 -2392 true false false 6 false true false false -1786000 -1786 true false false 7 false true false false -4784000 -4784 true false false 8 false true false false -3572000 -3572 true false false 9 false true false false -1302000 -1302 true false false 10 false true false false -1322000 -1322 true false false 11 false true false false -2668000 -2668 true false false 12 false true false false -2593000 -2593 true false false xbrli:monetaryItemType monetary An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h false 9 Amortization of prior service cost 4 us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false true false false 57000 57 true false false 6 false true false false 73000 73 true false false 7 false true false false 114000 114 true false false 8 false true false false 146000 146 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h false 10 Amortization of transition obligation 4 us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false true false false 18000 18 true false false 10 false true false false 18000 18 true false false 11 false true false false 36000 36 true false false 12 false true false false 35000 35 true false false xbrli:monetaryItemType monetary The amount of the transition obligation or asset recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h false 11 Recognized net actuarial loss 4 us-gaap_DefinedBenefitPlanActuarialNetGainsLosses us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false true false false 705000 705 true false false 6 false true false false 1031000 1031 true false false 7 false true false false 1410000 1410 true false false 8 false true false false 2062000 2062 true false false 9 false true false false 175000 175 true false false 10 false true false false 61000 61 true false false 11 false true false false 356000 356 true false false 12 false true false false 118000 118 true false false xbrli:monetaryItemType monetary The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a true 12 Net pension expense 4 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false true false false 2239000 2239 true false false 6 false true false false 2834000 2834 true false false 7 false true false false 4478000 4478 true false false 8 false true false false 5668000 5668 true false false 9 false true false false 1145000 1145 true false false 10 false true false false 577000 577 true false false 11 false true false false 2360000 2360 true false false 12 false true false false 1150000 1150 true false false xbrli:monetaryItemType monetary The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain or loss, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h true 13 Liability under the restoration plan 3 us-gaap_DefinedBenefitPlanBenefitObligation us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false true false false 6000000 6000000 true false false 4 false true false false 8000000 8000000 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. The projected benefit obligation is measured using assumptions as to future compensation levels if the pension benefit formula is based on those future compensation levels (pay-related, final-pay, final-average-pay, or career-average-pay plans). For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. Prior to an employee's full eligibility date, the accumulated postretirement benefit obligation as of a particular date for an employee is the portion of the expected postretirement benefit obligation attributed to that employee's service rendered to that date; on and after the full eligibility date, the accumulated and expected postretirement benefit obligations for an employee are the same. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 6 -Subparagraph a Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph E1 false 14 Value of investments held for out benefit to mitigate phantom investment income and losses 3 us-gaap_Investments us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false true false false 7000000 7000000 true false false 4 false true false false 8000000 8000000 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of current and noncurrent investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph h -Article 7 false 17 Employee Benefit Plans (Textuals) 3 ne_EmployeeBenefitPlansTextualsAbstract ne false na duration Employee Benefit Plans. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:stringItemType string Employee Benefit Plans. false 18 Pension plan fund target for 2011 4 ne_PensionPlanFundTargetForNextYear ne false na duration Pension plan fund target for 2011. false false false false false false false false false false false verboselabel false 1 false true false false 1 1 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false us-types:percentItemType pure Pension plan fund target for 2011. No authoritative reference available. false 19 Contributions to pension plans 4 us-gaap_DefinedBenefitPlanContributionsByEmployer us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 5000000 5000000 true false false 2 false true false false 1000000 1000000 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of contributions made by the employer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b false 20 Expected contributions to pension plans during 2010 4 ne_DefinedBenefitPlanEstimatedTotalForCurrentFiscalYear ne false debit instant Defined Benefit Plan Estimated Total For Current Fiscal Year false false false false false false false false false false false terselabel false 1 true true false false 17000000 17000000 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Defined Benefit Plan Estimated Total For Current Fiscal Year No authoritative reference available. false 12 14 false Thousands UnKnown UnKnown false true