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Sale/ Leaseback Arrangements - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2016 USD ($) Vessel	Dec. 31, 2016 USD ($) Vessel
Sale Leaseback Transaction [Line Items]
Deferred gain amortization from sale leaseback transactions | $	$ 5.8	$ 17.5
Sale/Leaseback Arrangement
Sale Leaseback Transaction [Line Items]
Number of vessels operating	16	16
Number of vessels stacked	10	10

X

- Definition

Deferred gain amortization from sale leaseback transactions.

+ References

No definition available.

+ Details

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Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of vessels.

+ References

No definition available.

+ Details

Name:	tdw_NumberOfVessel
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of vessels stacked.

+ References

No definition available.

+ Details

Name:	tdw_NumberOfVesselsStacked
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleLeasebackTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SaleLeasebackTransactionDescriptionAxis=tdw_SaleLeasebackArrangementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: