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Summary of Net Properties and Equipment (Parenthetical) (Detail) (Other Property Plant and Equipment)	Mar. 31, 2015 Vehicle	Mar. 31, 2014 Vehicle
Other Property Plant and Equipment
Property, Plant and Equipment [Line Items]
Number of remotely operated vehicles	2tdw_NumberOfVehicles / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember	6tdw_NumberOfVehicles / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember

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

- Details

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