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Summary of Net Properties and Equipment (Parenthetical) (Detail) - Other Property Plant and Equipment - Vehicle	Dec. 31, 2017	Mar. 31, 2017
Property, Plant and Equipment [Line Items]
Number of remotely operated vehicles		8
Number of remotely operated vehicles sold	8

X

- Definition

Number of Vehicles

+ References

No definition available.

+ Details

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

X

- Definition

Number of vehicles sold.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: