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Properties and Equipment, Accrued Expenses, Other Current Liabilities and Other Liabilities - Additional Information (Details) | Mar. 31, 2020 Vessel
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Properties And Equipment Other Assets Accrued Expenses Other Current Liabilities And Other Liabilities [Abstract] |
Number of vessels | 170

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

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- 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