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Summaries of Net Properties and Equipment (Parenthetical) (Detail) - Other Property Plant and Equipment - Vehicle | Dec. 31, 2017 | Mar. 31, 2017
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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

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- 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

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- 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: |