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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract] |  |
Change in pension plan and supplemental pension plan liability | $ 0.2 | $ 0.2

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- Definition Other comprehensive income pension plan and supplemental pension plan liability adjustment tax period increase decrease. + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration