XML 81 R61.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Investment in Unconsolidated Companies (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | ---
Sonatide Marine, Ltd. |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage in unconsolidated affiliates | 49.00% |
Investments in, at equity, and advances to unconsolidated companies | $ 26,935 |
Sonatide Marine, Ltd. | Predecessor |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in, at equity, and advances to unconsolidated companies |  | $ 45,115
DTDW Holdings, Ltd. |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage in unconsolidated affiliates | 40.00% |
Investments in, at equity, and advances to unconsolidated companies | $ 2,281 |
Sonatide Marine Ltd and DTDW Holdings Ltd. |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in, at equity, and advances to unconsolidated companies | $ 29,216 |
Sonatide Marine Ltd and DTDW Holdings Ltd. | Predecessor |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in, at equity, and advances to unconsolidated companies |  | $ 45,115

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the entity's ownership percentage in the investee multiplied by the investee's total equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=tdw_SonatideMarineLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=tdw_DtdwHoldingsLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=tdw_SonatideMarineLtdAndDtdwHoldingsLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |