XML 94 R82.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2017
Debt [Line Items] |  |  |
Amount outstanding |  | $ 436,403 | $ 438,827
Predecessor |  |  |
Debt [Line Items] |  |  |
Aggregate debt outstanding | $ 500,000 |  |
Weighted average remaining life in years | 6 years 4 months 24 days |  |
Weighted average coupon rate on notes outstanding | 4.86% |  |
Fair value of debt outstanding | $ 280,000 |  |
September 2010 Senior Unsecured Notes | Predecessor |  |  |
Debt [Line Items] |  |  |
Aggregate debt outstanding | $ 382,500 |  |
Weighted average remaining life in years | 3 years 1 month 6 days |  |
Weighted average coupon rate on notes outstanding | 4.35% |  |
Fair value of debt outstanding | $ 214,200 |  |
August 2011 Senior Unsecured Notes | Predecessor |  |  |
Debt [Line Items] |  |  |
Aggregate debt outstanding | $ 165,000 |  |
Weighted average remaining life in years | 3 years 7 months 6 days |  |
Weighted average coupon rate on notes outstanding | 4.42% |  |
Fair value of debt outstanding | $ 92,400 |  |
Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Weighted average coupon rate on notes outstanding |  | 5.00% |
Troms Offshore Supply AS | May 2015 notes |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 25,463
Fair value of debt outstanding |  |  | 25,427
Troms Offshore Supply AS | May 2015 notes | Predecessor |  |  |
Debt [Line Items] |  |  |
Amount outstanding | 27,421 |  |
Fair value of debt outstanding | 27,395 |  |
Troms Offshore Supply AS | March 2015 notes |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 23,345
Fair value of debt outstanding |  |  | $ 23,251
Troms Offshore Supply AS | March 2015 notes | Predecessor |  |  |
Debt [Line Items] |  |  |
Amount outstanding | 24,573 |  |
Fair value of debt outstanding | $ 24,544 |  |

X
- Definition Weighted Average Life To Maturity + References No definition available. + Details
Name: | tdw_WeightedAverageLifeToMaturity
Namespace Prefix: | tdw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
Name: | us-gaap_DebtInstrumentFairValue
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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_UnsecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=tdw_TromsOffshoreSupplyAsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tdw_MayTwoThousandFifteenAndFourPointTwentyTwoPercentUnitedStatesDollarDenominatedBorrowingAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tdw_MarchTwoThousandFifteenAndFourPointTwentyOnePercentUnitedStatesDollarDenominatedBorrowingAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |