Properties and Equipment, Accrued Expenses, Other Current Liabilities and Other Liabilities - Additional Information (Details)	6 Months Ended
Jun. 30, 2020 Vessel
Properties And Equipment Other Assets Accrued Expenses Other Current Liabilities And Other Liabilities [Abstract]
Number of vessels	146
Number Of vessels held for sale	46

Properties and equipment other assets accrued expenses other current liabilities and other liabilities.

No definition available.

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