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Summary of Unaudited Pro Forma Balance Sheet (Parenthetical) (Detail) $ in Millions	Jun. 30, 2017 USD ($)
Reorganizations [Abstract]
Success fees	$ 12.4

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- Definition

Success fees.

+ References

No definition available.

+ Details

Name:	tdw_SuccessFees
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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