XML 87 R70.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Schedule of Losses Before Income Taxes Derived from United States and Non-U.S Operation (Detail) - USD ($) $ in Thousands | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Mar. 31, 2017
Schedule Of Components Of Income Before Income Tax Expense Benefit [Line Items] |  |  |  |
Losses before income taxes, Non-U.S |  | $ (5,137) | $ (99,607) |
Losses before income taxes, Non-U.S |  | (31,550) | (53,912) |
Total pre-tax amounts |  | $ (36,687) | $ (153,519) |
Predecessor |  |  |  |
Schedule Of Components Of Income Before Income Tax Expense Benefit [Line Items] |  |  |  |
Losses before income taxes, Non-U.S | $ (1,603,788) |  |  | $ (498,931)
Losses before income taxes, Non-U.S | (44,355) |  |  | (144,683)
Total pre-tax amounts | $ (1,648,143) |  |  | $ (643,614)

X
- Definition Sum of operating profit and nonoperating income (expense) before income taxes. + References No definition available. + Details
Name: | tdw_IncomeLossFromContinuingOperationsBeforeIncomeTaxes
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items] + References No definition available. + Details
Name: | tdw_ScheduleOfComponentsOfIncomeBeforeIncomeTaxExpenseBenefitLineItems
Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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