XML 161 R141.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Schedule of Gain on Disposition of Assets (Detail) $ in Thousands | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 USD ($) Vessel | Dec. 31, 2017 USD ($) Vessel | Mar. 31, 2017 USD ($) Vessel
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |
Gain (loss) on vessels disposed |  | $ 6,616 |
Number of vessels disposed | Vessel |  | 11 |
Predecessor |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |
Gain (loss) on vessels disposed | $ 3,561 |  | $ 24,099
Number of vessels disposed | Vessel | 7 |  | 12
Vessels |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |
Gain (loss) on vessels disposed |  | $ (163) |
Vessels | Predecessor |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |
Gain (loss) on vessels disposed | $ 509 |  | $ (102)

X
- Definition Number of Vessels Sold or Scrapped + References No definition available. + Details
Name: | tdw_NumberOfVesselsSoldOrScrapped
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 + Details
Name: | us-gaap_GainLossOnDispositionOfAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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_ImpairedAssetsToBeDisposedOfByMethodOtherThanSaleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=tdw_VesselsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |