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Recently Adopted Accounting Pronouncements - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Accounting Changes And Error Corrections [Abstract]
Reduction in trade and other receivables,net	$ 0.2

X

- Definition

Increase (decrease) in trade and other receivables net.

+ References

No definition available.

+ Details

Name:	tdw_IncreaseDecreaseInTradeAndOtherReceivablesNet
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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