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Subsequent Events - Additional Information (Detail) - Jeffrey M. Platt - Subsequent Event $ in Thousands | Oct. 15, 2017 USD ($)
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Subsequent Event [Line Items] |
Settlement of distribution | $ 1,220
Supplemental executive retirement plan obligation settlement payable | $ 9,600
Supplemental executive retirement plan obligation settlement date | 2018-04
Estimated supplemental savings plan obligation settlement payable | $ 1,100
Estimated benefit plan gain (loss) due to settlements | $ 500

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- Definition Estimated benefit plan gain (loss) due to settlements. + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Estimated supplemental savings plan obligation settlement payable. + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Supplemental executive retirement plan obligation settlement date. + References No definition available. + Details
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Balance Type: | na
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- Definition Supplemental executive retirement plan obligation settlement payable. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of distribution made to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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- Details
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