XML 88 R76.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Schedule of Unrecognized Tax Benefits Which Would Lower Effective Tax Rate if Realized (Detail) - State and Local Jurisdiction - USD ($) $ in Thousands | 5 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2017 | Jun. 30, 2018
Income Tax Contingency [Line Items] |  |
Unrecognized tax benefit related to state tax issues | $ 12,425 | $ 12,425
Interest receivable on unrecognized tax benefit related to state tax issues | $ 54 | $ 58

X
- Definition This element represents an interest income receivable on an uncertain tax position. + References No definition available. + Details
Name: | tdw_UnrecognizedTaxBenefitInterestIncomeReceivable
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The gross amount of unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return. + References No definition available. + Details
Name: | tdw_UnrecognizedTaxBenefitsCurrentAndPriorPeriodTaxPositions
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_IncomeTaxContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |