XML 152 R144.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Commitment and Contingencies (Arbitral Award for the Taking of the Company's Venezuelan Operations) - Additional Information (Detail) - VENEZUELA - Compensatory Purposes [Member] $ in Millions | 1 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 27, 2016 USD ($) | Mar. 13, 2015 USD ($) | Jun. 30, 2018 USD ($) Subsidiary | Dec. 31, 2017 USD ($)
Significant Purchase And Supply Commitment [Line Items] |  |  |  |
"Number of subsidiaries awarded grant | Subsidiary" |  |  | 2 | 2,000,000
Compensation awarded to the claimants | $ 36.4 | $ 46.4 | $ 56.9 | $ 56.1
Litigation settlement reduction amount | $ 10.0 |  |  |
Litigation Settlement Interest Percentage Of Interest | 4.50% |  |  |
Litigation settlement accrual interest |  |  | $ 0.6 |
Net Interest Settlements |  |  |  |
Significant Purchase And Supply Commitment [Line Items] |  |  |  |
Compensation awarded to the claimants |  |  |  | $ 17.1
Legal And Other Settlements [Member] |  |  |  |
Significant Purchase And Supply Commitment [Line Items] |  |  |  |
Compensation awarded to the claimants | $ 2.5 |  |  |

X
- Definition Litigation Settlement Interest Percentage Of Interest + References No definition available. + Details
Name: | tdw_LitigationSettlementInterestPercentageOfInterest
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Litigation Settlement Reduction Amount + References No definition available. + Details
Name: | tdw_LitigationSettlementReductionAmount
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number Of Subsidiaries Awarded Grant + References No definition available. + Details
Name: | tdw_NumberOfSubsidiariesAwardedGrant
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Significant Purchase And Supply Commitment [Line Items] + References No definition available. + Details
Name: | tdw_SignificantPurchaseAndSupplyCommitmentLineItems
Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Interest expense (income) directly attributable to an award in settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_VE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationStatusAxis=tdw_CompensatoryPurposesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GainContingenciesByNatureAxis=tdw_NetInterestSettlementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GainContingenciesByNatureAxis=tdw_LegalAndOtherSettlementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |