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v3.20.2

Recently Adopted Accounting Pronouncements - Additional Information (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2020 USD ($)
Accounting Changes And Error Corrections [Abstract] |
Reduction in trade and other receivables,net | $ 0.2

X
- Definition Increase (decrease) in trade and other receivables net. + References No definition available. + Details
Name: | tdw_IncreaseDecreaseInTradeAndOtherReceivablesNet
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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