XML 1054 R50.htm IDEA: XBRL DOCUMENT
v2.4.1.9

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