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Sale/ Leaseback Arrangements - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) Vessel | Sep. 30, 2016 USD ($) Vessel
Sale Leaseback Transaction [Line Items] |  |
Deferred gains on sale/leaseback transactions | $ | $ 5.9 | $ 11.7
Sale/Leaseback Arrangement |  |
Sale Leaseback Transaction [Line Items] |  |
Number of vessels operating | 16 | 16
Number of vessels stacked | 9 | 9

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- Definition Number of vessels. + References No definition available. + Details
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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 The portion of the deferred gain that was recognized in the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35688829&loc=d3e50609-112754 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |