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Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail) R$ in Millions, $ in Millions	1 Months Ended	3 Months Ended
	May 31, 2016 BRL (R$)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 BRL (R$)	Apr. 30, 2011 BRL (R$)
Commitments And Contingencies Disclosure [Abstract]
Fines assessed		$ 10.0		R$ 33
Fines assessed	R$ 3	0.9
Deposit Amount		1.8	R$ 6
Remaining amount of fines contested		$ 9.1	R$ 30

X

- Definition

Assessed fine.

+ References

No definition available.

+ Details

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

X

- Definition

Assessed fine original.

+ References

No definition available.

+ Details

Name:	tdw_AssessedFineOriginal
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Deposit amount.

+ References

No definition available.

+ Details

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

X

- Definition

Remaining fine amount.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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