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Schedule of Vessel Commitments (Parenthetical) (Detail) | 9 Months Ended
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Dec. 31, 2016 Vessel
Option Agreement |
Significant Purchase and Supply Commitment [Line Items] |
Number of vessels under construction | 2

X
- Definition Significant commitments, new construction. + References No definition available. + Details
Name: | tdw_SignificantCommitmentsNewConstruction
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Significant Purchase and Supply Commitment [Line Items] + References No definition available. + Details
Name: | tdw_SignificantPurchaseAndSupplyCommitmentLineItems
Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=tdw_OptionAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |