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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Change in pension plan and supplemental pension plan liability	$ 0	$ 0

X

- Definition

Other comprehensive income pension plan and supplemental pension plan liability adjustment tax period increase decrease.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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