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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

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- Definition This element represents an interest income receivable on an uncertain tax position. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- 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
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Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |