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Restructuring Charges - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2019
Restructuring And Related Activities [Abstract] |  |
Lease term expiration |  | lease terms expiring between 2023 and 2026
Lease exit and severance charges | $ 7.3 | $ 5.9

X
- Definition Business exit costs and severance charges. + References No definition available. + Details
Name: | tdw_BusinessExitCostsAndSeveranceCharges
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Description of lease term expiration. + References No definition available. + Details
Name: | tdw_DescriptionOfLeaseTermExpiration
Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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