XML 102 R82.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Schedule of Carrying Value of Trust Assets and Obligations Under Supplemental Plan (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments held in Rabbi Trust | [1] | $ 8,908 |
Obligations under the supplemental plan |  | $ 32,508 |
Predecessor |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments held in Rabbi Trust |  |  | $ 8,759
Obligations under the supplemental plan |  |  | $ 29,108
[1] | The company plans to liquidate the rabbi trust (valued at $8.9 million as of December 31, 2017) in advance of paying a lump sum benefit to the former CEO in April 2018 of $9.6 million.

X
- Definition Defined Benefit Plan Supplemental Plan Obligations + References No definition available. + Details
Name: | tdw_DefinedBenefitPlanSupplementalPlanObligations
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DeferredCompensationPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |