XML 1056 R75.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Employee Retirement Plans - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2010 Person | Mar. 31, 2015 Person | Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2012
Schedule Of Defined Benefit Plans Disclosures [Line Items] |  |  |  |  |
Number of employers participated in defined benefit plan | 60 tdw_DefinedBenefitPlanNumberOfEmployeesParticipating |  |  |  |
Number of employers still remains in defined benefit plan |  | 45 tdw_DefinedBenefitPlanNumberOfEmployeesRemainingInPlan |  |  |
Percentage of defined benefit plan, actuarial discount rate assumption |  | 4.00%tdw_DefinedBenefitPlanActuarialDiscountRateAssumption |  |  |
Defined benefit plan, significant concentrations of risk |  | The pension plan and the supplemental plan assets are periodically evaluated for concentration risks. As of March 31, 2015, the company did not have any individual asset investments that comprised 10% or more of each plan's overall assets. |  |  |
Defined benefit plan, concentration risk, assets, debt securities, maximum single issuer |  | 5.00%tdw_DefinedBenefitPlanConcentrationRiskAssetsDebtSecuritiesMaximumSingleIssuer |  |  |
Defined benefit plan, concentration risk, assets, debt securities, maximum value single issuer |  | $ 2,500,000 tdw_DefinedBenefitPlanConcentrationRiskAssetsDebtSecuritiesMaximumValueSingleIssuer |  |  |
Defined benefit plan, concentration risk, assets, equity securities, difference plan assets and liabilities |  | 15.00%tdw_DefinedBenefitPlanConcentrationRiskAssetsEquitySecuritiesDifferencePlanAssetsAndLiabilities |  |  |
Defined benefit plan, concentration risk, assets, equity securities, maximum single investment |  | 5.00%tdw_DefinedBenefitPlanConcentrationRiskAssetsEquitySecuritiesMaximumSingleInvestment |  |  |
Defined benefit plan, concentration risk, assets, equity securities, maximum foreign and us stock |  | 10.00%tdw_DefinedBenefitPlanConcentrationRiskAssetsEquitySecuritiesMaximumOfForeignAndUsStock |  |  |
Defined benefit plan, concentration risk, diversification, equity limit, single industry |  | 25.00%tdw_DefinedBenefitPlanConcentrationRiskDiversificationEquityLimitSingleIndustry |  |  |
Defined benefit plan, concentration risk, diversification, equity limit, single corporation |  | 10.00%tdw_DefinedBenefitPlanConcentrationRiskDiversificationEquityLimitSingleCorporation |  |  |
Defined benefit plan, concentration risk, diversification, debt limit, single issuer |  | 10.00%tdw_DefinedBenefitPlanConcentrationRiskDiversificationDebtLimitSingleIssuer |  |  |
Retirement Contributions |  |  |  |  |
Schedule Of Defined Benefit Plans Disclosures [Line Items] |  |  |  |  |
Defined contribution plan, company contribution percentage |  | 3.00%tdw_DefinedContributionPlanCompanyContributionPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_RetirementPlansContributionsMember |  |  |
Defined contribution plan, company contribution, vesting period, years |  | 5 tdw_DefinedContributionPlanCompanyContributionVestingPeriod / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_RetirementPlansContributionsMember |  |  |
Retirement Contributions | Minimum |  |  |  |  |
Schedule Of Defined Benefit Plans Disclosures [Line Items] |  |  |  |  |
Defined contribution plan, company contribution percentage additional percentage |  | 1.00%tdw_DefinedContributionPlanCompanyContributionPercentageAdditionalPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_RetirementPlansContributionsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Retirement Contributions | Maximum |  |  |  |  |
Schedule Of Defined Benefit Plans Disclosures [Line Items] |  |  |  |  |
Defined contribution plan, company contribution percentage additional percentage |  | 8.00%tdw_DefinedContributionPlanCompanyContributionPercentageAdditionalPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_RetirementPlansContributionsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Defined Contribution Pension Plan 401k |  |  |  |  |
Schedule Of Defined Benefit Plans Disclosures [Line Items] |  |  |  |  |
Defined contribution plan, company contribution, vesting period, years |  | 5 tdw_DefinedContributionPlanCompanyContributionVestingPeriod / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_DefinedContributionPensionPlanFourZeroOneKMember |  |  |
Percentage of defined plan, minimum employee contribution |  | 2.00%tdw_DefinedContributionPlanPercentContributedByEmployeeMinimum / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_DefinedContributionPensionPlanFourZeroOneKMember |  |  |
Percentage of defined plan, maximum employee contribution |  | 75.00%tdw_DefinedContributionPlanPercentContributedByEmployeeMaximum / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_DefinedContributionPensionPlanFourZeroOneKMember |  |  |
Defined contribution plan, company contribution percentage match, common stock |  | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_DefinedContributionPensionPlanFourZeroOneKMember |  |  |
Defined contribution plan, company contribution percentage match, common stock |  | 8.00%tdw_DefinedContributionPlanCompanyContributionPercentageMatchCommonStock / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_DefinedContributionPensionPlanFourZeroOneKMember |  |  |
Non-Qualified Supplemental Savings Plan Executives |  |  |  |  |
Schedule Of Defined Benefit Plans Disclosures [Line Items] |  |  |  |  |
Defined contribution plan, company contribution percentage match, common stock |  | 50.00%tdw_DefinedContributionPlanCompanyContributionPercentageMatchCommonStock / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_NonQualifiedSupplementalSavingsPlanExecutivesMember |  |  |
Deferred compensation arrangement with individual, deferred compensation percentage |  | 50.00%tdw_DeferredCompensationArrangementWithIndividualDeferredCompensationPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_NonQualifiedSupplementalSavingsPlanExecutivesMember |  |  |
Deferred compensation arrangement with individual, deferred bonus percentage |  | 100.00%tdw_DeferredCompensationArrangementWithIndividualDeferredBonusPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_NonQualifiedSupplementalSavingsPlanExecutivesMember |  |  |
Defined contribution plan, restoration benefit |  | 3.00%tdw_DefinedContributionPlanRestorationBenefit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_NonQualifiedSupplementalSavingsPlanExecutivesMember |  |  |
Non-Qualified Supplemental Savings Plan Executives | Minimum |  |  |  |  |
Schedule Of Defined Benefit Plans Disclosures [Line Items] |  |  |  |  |
Defined contribution plan, company contribution percentage additional percentage |  | 1.00%tdw_DefinedContributionPlanCompanyContributionPercentageAdditionalPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_NonQualifiedSupplementalSavingsPlanExecutivesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Non-Qualified Supplemental Savings Plan Executives | Maximum |  |  |  |  |
Schedule Of Defined Benefit Plans Disclosures [Line Items] |  |  |  |  |
Defined contribution plan, company contribution percentage additional percentage |  | 8.00%tdw_DefinedContributionPlanCompanyContributionPercentageAdditionalPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_NonQualifiedSupplementalSavingsPlanExecutivesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Multinational Pension Savings Plan |  |  |  |  |
Schedule Of Defined Benefit Plans Disclosures [Line Items] |  |  |  |  |
Defined contribution plan, company contribution, vesting period, years |  | 6 tdw_DefinedContributionPlanCompanyContributionVestingPeriod / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_MultinationalPensionSavingsPlanMember |  |  |
Percentage of defined plan, minimum employee contribution |  | 1.00%tdw_DefinedContributionPlanPercentContributedByEmployeeMinimum / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_MultinationalPensionSavingsPlanMember |  |  |
Percentage of defined plan, maximum employee contribution |  | 15.00%tdw_DefinedContributionPlanPercentContributedByEmployeeMaximum / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_MultinationalPensionSavingsPlanMember |  |  |
Percentage of defined plan, company contribution match, cash |  | 50.00%tdw_DefinedContributionPlanCompanyContributionPercentageMatchCash / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_MultinationalPensionSavingsPlanMember |  |  |
Percentage of defined plan, company contribution match, employee deferred compensation |  | 6.00%tdw_DefinedContributionPlanCompanyContributionPercentageMatchDeferredCompensation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_MultinationalPensionSavingsPlanMember |  |  |
Pension Plans, Defined Benefit |  |  |  |  |
Schedule Of Defined Benefit Plans Disclosures [Line Items] |  |  |  |  |
Defined benefit plan, employer contributions |  |  | 0 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | 0 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Supplemental Executive Retirement Plan |  |  |  |  |
Schedule Of Defined Benefit Plans Disclosures [Line Items] |  |  |  |  |
Defined benefit plan, employer contributions |  | 0 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | 0 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember |  |
Chief Executive Officer |  |  |  |  |
Schedule Of Defined Benefit Plans Disclosures [Line Items] |  |  |  |  |
Distribution in settlement of plan obligation |  |  |  |  | 13,000,000 us-gaap_DefinedBenefitPlanBenefitsPaid / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Settlement loss recognized |  |  |  | $ (5,200,000)us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember | $ 5,200,000 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember

X
- Definition Deferred Compensation Arrangement with Individual Deferred Bonus Percentage + References No definition available. + Details
Name: | tdw_DeferredCompensationArrangementWithIndividualDeferredBonusPercentage
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Compensation Arrangement with Individual Deferred Compensation Percentage + References No definition available. + Details
Name: | tdw_DeferredCompensationArrangementWithIndividualDeferredCompensationPercentage
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan, Actuarial Discount Rate Assumption + References No definition available. + Details
Name: | tdw_DefinedBenefitPlanActuarialDiscountRateAssumption
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan, Concentration Risk, Assets, Debt Securities, Maximum Single Issuer + References No definition available. + Details
Name: | tdw_DefinedBenefitPlanConcentrationRiskAssetsDebtSecuritiesMaximumSingleIssuer
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan, Concentration Risk, Assets, Debt Securities, Maximum Value Single Issuer + References No definition available. + Details
Name: | tdw_DefinedBenefitPlanConcentrationRiskAssetsDebtSecuritiesMaximumValueSingleIssuer
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Defined Benefit Plan, Concentration Risk, Assets, Equity Securities, Difference plan assets and liabilities + References No definition available. + Details
Name: | tdw_DefinedBenefitPlanConcentrationRiskAssetsEquitySecuritiesDifferencePlanAssetsAndLiabilities
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan, Concentration Risk, Assets, Equity Securities, Maximum of Foreign and US Stock + References No definition available. + Details
Name: | tdw_DefinedBenefitPlanConcentrationRiskAssetsEquitySecuritiesMaximumOfForeignAndUsStock
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan, Concentration Risk, Assets, Equity Securities, Maximum Single Investment + References No definition available. + Details
Name: | tdw_DefinedBenefitPlanConcentrationRiskAssetsEquitySecuritiesMaximumSingleInvestment
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan, Concentration Risk, Diversification, Debt Limit, Single Issuer + References No definition available. + Details
Name: | tdw_DefinedBenefitPlanConcentrationRiskDiversificationDebtLimitSingleIssuer
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan, Concentration Risk, Diversification, Equity Limit, Single Corporation + References No definition available. + Details
Name: | tdw_DefinedBenefitPlanConcentrationRiskDiversificationEquityLimitSingleCorporation
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan, Concentration Risk, Diversification, Equity Limit, Single Industry + References No definition available. + Details
Name: | tdw_DefinedBenefitPlanConcentrationRiskDiversificationEquityLimitSingleIndustry
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan, Number of Employees Participating + References No definition available. + Details
Name: | tdw_DefinedBenefitPlanNumberOfEmployeesParticipating
Namespace Prefix: | tdw_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan Number of Employees Remaining In Plan + References No definition available. + Details
Name: | tdw_DefinedBenefitPlanNumberOfEmployeesRemainingInPlan
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan Company Contribution Percentage + References No definition available. + Details
Name: | tdw_DefinedContributionPlanCompanyContributionPercentage
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Company Contribution Percentage Additional Percentage + References No definition available. + Details
Name: | tdw_DefinedContributionPlanCompanyContributionPercentageAdditionalPercentage
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Company Contribution Percentage Match Cash + References No definition available. + Details
Name: | tdw_DefinedContributionPlanCompanyContributionPercentageMatchCash
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan Company Contribution Percentage Match Common Stock + References No definition available. + Details
Name: | tdw_DefinedContributionPlanCompanyContributionPercentageMatchCommonStock
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Company Contribution Percentage Match Deferred Compensation + References No definition available. + Details
Name: | tdw_DefinedContributionPlanCompanyContributionPercentageMatchDeferredCompensation
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Company Contribution Vesting Period + References No definition available. + Details
Name: | tdw_DefinedContributionPlanCompanyContributionVestingPeriod
Namespace Prefix: | tdw_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan Percent Contributed By Employee Maximum + References No definition available. + Details
Name: | tdw_DefinedContributionPlanPercentContributedByEmployeeMaximum
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Defined Contribution Plan Percent Contributed By Employee Minimum + References No definition available. + Details
Name: | tdw_DefinedContributionPlanPercentContributedByEmployeeMinimum
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Defined Contribution Plan, Restoration Benefit + References No definition available. + Details
Name: | tdw_DefinedContributionPlanRestorationBenefit
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | tdw_ScheduleOfDefinedBenefitPlansDisclosuresLineItems
Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=6506267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=6506309 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanBenefitsPaid
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Narrative that provides an understanding of significant concentrations of risk within plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
Name: | us-gaap_DefinedBenefitPlanSignificantConcentrationsOfRisk
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=tdw_DefinedContributionPensionPlanFourZeroOneKMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=tdw_MultinationalPensionSavingsPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=tdw_NonQualifiedSupplementalSavingsPlanExecutivesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=tdw_RetirementPlansContributionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |