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Properties and Equipment, Accrued Expenses, Other Current Liabilities and Other Liabilities - Additional Information (Details) | 6 Months Ended
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Jun. 30, 2020 Vessel
Properties And Equipment Other Assets Accrued Expenses Other Current Liabilities And Other Liabilities [Abstract] |
Number of vessels | 146
Number Of vessels held for sale | 46

X
- Definition Number of vessels. + References No definition available. + Details
Name: | tdw_NumberOfVessels
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of vessels held for sale. + References No definition available. + Details
Name: | tdw_NumberOfVesselsHeldForSale
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Properties and equipment other assets accrued expenses other current liabilities and other liabilities. + References No definition available. + Details
Name: | tdw_PropertiesAndEquipmentOtherAssetsAccruedExpensesOtherCurrentLiabilitiesAndOtherLiabilitiesAbstract
Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration