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Sale/ Leaseback Arrangements - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) Vessel | Dec. 31, 2016 USD ($) Vessel
Sale Leaseback Transaction [Line Items] |  |
Deferred gain amortization from sale leaseback transactions | $ | $ 5.8 | $ 17.5
Sale/Leaseback Arrangement |  |
Sale Leaseback Transaction [Line Items] |  |
Number of vessels operating | 16 | 16
Number of vessels stacked | 10 | 10

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- Definition Deferred gain amortization from sale leaseback transactions. + References No definition available. + Details
Name: | tdw_DeferredGainAmortizationFromSaleLeasebackTransactions
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of vessels. + References No definition available. + Details
Name: | tdw_NumberOfVessel
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of vessels stacked. + References No definition available. + Details
Name: | tdw_NumberOfVesselsStacked
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_SaleLeasebackTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SaleLeasebackTransactionDescriptionAxis=tdw_SaleLeasebackArrangementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |