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Schedule of Vessel Commitments (Parenthetical) (Detail)	3 Months Ended
	Jun. 30, 2017 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: