XML 90 R78.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Summary of Debt Outstanding (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Debt [Line Items] |  |  |
Amount outstanding including debt premium and discounts, net |  | $ 448,160 |
Amount outstanding | $ 436,403 | 438,827 |
Debt premiums and discounts, net | 8,446 | 9,333 |
Less: Current portion of long-term debt | 6,290 | 5,103 |
Total long-term debt | 438,559 | 443,057 |
8.00% New Secured Notes Due August 2022 |  |  |
Debt [Line Items] |  |  |
New secured notes | 349,954 | 350,000 |
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding | 13,595 | 14,054 |
Premium |  | 115 |
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding | 25,315 | 25,965 |
Discount |  | (1,586) |
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding | 22,729 | 23,345 |
Discount |  | (1,678) |
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding | $ 24,810 | 25,463 |
Discount |  | (1,847) |
New Secured Notes [Member] |  |  |
Debt [Line Items] |  |  |
Premium |  | $ 14,329 |
Predecessor |  |  |
Debt [Line Items] |  |  |
Amount outstanding including debt premium and discounts, net |  |  | $ 2,040,525
Less: Deferred debt issue costs |  |  | 6,401
Less: Current portion of long-term debt |  |  | 2,034,124
Predecessor | Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 14,864
Predecessor | Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 26,167
Predecessor | United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 24,573
Predecessor | United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 27,421
Predecessor | Bank Term Loan Due July Two Thousand Nineteen [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 300,000
Predecessor | Three Point Nine Zero Percent September Two Thousand Ten Senior Notes Due December Two Thousand Seventeen [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 44,500
Predecessor | Three Point Nine Five Percent September Two Thousand Ten Senior Notes Due December Two Thousand Seventeen [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 25,000
Predecessor | Four Point One Two Percent September Two Thousand Ten Senior Notes Due December Two Thousand Eighteen [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 25,000
Predecessor | Four Point One Seven Percent September Two Thousand Ten Senior Notes Due December Two Thousand Eighteen [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 25,000
Predecessor | Four Point Three Three Percent September Two Thousand Ten Senior Notes Due December Two Thousand Nineteen [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 50,000
Predecessor | Four Point Five One Percent September Two Thousand Ten Senior Notes Due December Two Thousand Twenty [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 100,000
Predecessor | Four Point Five Six Percent September Two Thousand Ten Senior Notes Due December Two Thousand Twenty [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 65,000
Predecessor | Four Point Six One Percent September Two Thousand Ten Senior Notes Due December Two Thousand Twenty Two [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 48,000
Predecessor | Four Point Zero Six Percent August Two Thousand Eleven Senior Notes Due March Two Thousand Nineteen [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 50,000
Predecessor | Four Point Five Four Percent August Two Thousand Eleven Senior Notes Due June Two Thousand Twenty One [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 65,000
Predecessor | Four Point Six Four Percent August Two Thousand Eleven Senior Notes Due June Two Thousand Twenty One [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 50,000
Predecessor | Four Point Two Six Percent September Two Thousand Thirteen Senior Notes Due November Two Thousand Twenty [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 123,000
Predecessor | Five Point Zero One Percent September Two Thousand Thirteen Senior Notes Due November Two Thousand Twenty Three [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 250,000
Predecessor | Five Point One Six Percent September Two Thousand Thirteen Senior Notes Due November Two Thousand Twenty Five [Member] |  |  |
Debt [Line Items] |  |  |
Amount outstanding |  |  | 127,000
Predecessor | Revolving Credit Facility | Revolving Line Of Credit Due July 2019 |  |  |
Debt [Line Items] |  |  |
Outstanding borrowing |  |  | $ 600,000

X
- Definition Amount, before 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 No definition available. + Details
Name: | tdw_LongtermDebtIncludingDebtPremiumsAndDiscounts
Namespace Prefix: | tdw_
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 Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after accumulated amortization, of debt discount (premium). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28567-108399 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after accumulated amortization, of debt premium. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 + Details
Name: | us-gaap_DebtInstrumentUnamortizedPremium
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + 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 210.5-02.17) -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 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
Name: | us-gaap_DeferredFinanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 + Details
Name: | us-gaap_LongTermDebtNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: 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 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 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_SecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_EightPointZeroZeroPercentNewSecuredNotesDueAugustTwoThousandTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_NorwegianKronerDenominatedNotesDueMayTwoThousandTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_NorwegianKronerDenominatedNotesDueJanuaryTwoThousandTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_UnitedStatesDollarDenominatedNotesDueJanuaryTwoThousandTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_UnitedStatesDollarDenominatedNotesDueAprilTwoThousandTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_NewSecuredNotesMember
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_DebtInstrumentAxis=tdw_BankTermLoanDueJulyTwoThousandNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_ThreePointNineZeroPercentSeptemberTwoThousandTenSeniorNotesDueDecemberTwoThousandSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_ThreePointNineFivePercentSeptemberTwoThousandTenSeniorNotesDueDecemberTwoThousandSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_FourPointOneTwoPercentSeptemberTwoThousandTenSeniorNotesDueDecemberTwoThousandEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_FourPointOneSevenPercentSeptemberTwoThousandTenSeniorNotesDueDecemberTwoThousandEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_FourPointThreeThreePercentSeptemberTwoThousandTenSeniorNotesDueDecemberTwoThousandNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_FourPointFiveOnePercentSeptemberTwoThousandTenSeniorNotesDueDecemberTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_FourPointFiveSixPercentSeptemberTwoThousandTenSeniorNotesDueDecemberTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_FourPointSixOnePercentSeptemberTwoThousandTenSeniorNotesDueDecemberTwoThousandTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_FourPointZeroSixPercentAugustTwoThousandElevenSeniorNotesDueMarchTwoThousandNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_FourPointFiveFourPercentAugustTwoThousandElevenSeniorNotesDueJuneTwoThousandTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_FourPointSixFourPercentAugustTwoThousandElevenSeniorNotesDueJuneTwoThousandTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_FourPointTwoSixPercentSeptemberTwoThousandThirteenSeniorNotesDueNovemberTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_FivePointZeroOnePercentSeptemberTwoThousandThirteenSeniorNotesDueNovemberTwoThousandTwentyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_FivePointOneSixPercentSeptemberTwoThousandThirteenSeniorNotesDueNovemberTwoThousandTwentyFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_RevolvingLineOfCreditDueJulyTwoThousandNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |