XML 70 R59.htm IDEA: XBRL DOCUMENT v3.10.0.1

Commitment and Contingencies (Arbitral Award for the Taking of the Company's Venezuelan Operations) - Additional Information (Detail) - Compensatory Purposes - VENEZUELA $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($) Subsidiary
Commitments and Contingencies Disclosure [Line Items]
Number of subsidiaries awarded grant | Subsidiary	2
Compensation awarded to the claimants	$ 56.9
Litigation settlement accrual interest	$ 0.6

X

- Definition

Commitments and Contingencies Disclosure [Line Items]

+ References

No definition available.

+ Details

Name:	tdw_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix:	tdw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of subsidiaries awarded grant.

+ References

No definition available.

+ Details

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

X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Interest expense (income) directly attributable to an award in settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_LitigationStatusAxis=tdw_CompensatoryPurposesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_VE
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: