Capitalization Rate

No definition available.

Name:	tdw_CapitalizationRate
Namespace Prefix:	tdw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument Aggregate Rate

+ References

No definition available.

+ Details

Name:	tdw_DebtInstrumentAggregateRate
Namespace Prefix:	tdw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Maturity, Month and Year

+ References

No definition available.

+ Details

Name:	tdw_DebtInstrumentMaturityMonthAndYear
Namespace Prefix:	tdw_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility Expiration Dates

+ References

No definition available.

+ Details

Name:	tdw_LineOfCreditFacilityExpirationDates
Namespace Prefix:	tdw_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility, revolving line of credit

+ References

No definition available.

+ Details

Name:	tdw_LineOfCreditFacilityRevolvingLineOfCredit
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line of credit facility, term loan

+ References

No definition available.

+ Details

Name:	tdw_LineOfCreditFacilityTermLoan
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of Contracts Terminated

+ References

No definition available.

+ Details

Name:	tdw_NumberOfContractsTerminated
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Significant Commitment Number Of Vessel

+ References

No definition available.

+ Details

Name:	tdw_SignificantCommitmentNumberOfVessel
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Significant Commitment Remaining Balance Of Vessel Under Construction

+ References

No definition available.

+ Details

Name:	tdw_SignificantCommitmentRemainingBalanceOfVesselUnderConstruction
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Significant Commitments, New Construction

+ References

No definition available.

+ Details

Name:	tdw_SignificantCommitmentsNewConstruction
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Significant Commitments, New Construction Progress Payments Invested

+ References

No definition available.

+ Details

Name:	tdw_SignificantCommitmentsNewConstructionProgressPaymentsInvested
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Significant Supply Commitment, Expiration Date

+ References

No definition available.

+ Details

Name:	tdw_SignificantSupplyCommitmentExpirationDate
Namespace Prefix:	tdw_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Decrease for amounts of indebtedness forgiven by the holder of the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

+ Details

Name:	us-gaap_DebtInstrumentDecreaseForgiveness
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the required periodic payments applied to principal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-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://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=tdw_TromsOffshoreSupplyAsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	tdw_SignificantPurchaseAndSupplyCommitmentAxis=tdw_DeepwaterPlatformSupplyVesselsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=tdw_CurrentCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=tdw_VesselsUnderConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended	1 Months Ended			2 Months Ended	1 Months Ended	0 Months Ended
	Mar. 31, 2015	Mar. 31, 2015	Apr. 30, 2015 Contract	May 27, 2015	May 31, 2015 Vessel	May 27, 2015 Vessel	Apr. 23, 2015 Vessel	May 27, 2015
Subsequent Event [Line Items]
Amount remaining authorized to repurchase shares	$ 100,000,000	$ 100,000,000
Number of Vessels, commitments	21tdw_SignificantCommitmentNumberOfVessel	21tdw_SignificantCommitmentNumberOfVessel
Troms Offshore Supply AS \| Notes Due April 2027
Subsequent Event [Line Items]
Debt instruments face amount	29,500,000	29,500,000
Debt instrument maturity, month and year	2027-01
Semi-annual principal payments	1,200,000
Debt instrument bearing floating interest rate	2.91%	2.91%
Indebtedness rate	1.30%
Total capitalization rate	4.21%	4.21%
Deepwater PSVs
Subsequent Event [Line Items]
Aggregate installment payment	1,000,000	1,000,000
7145 BHP towing-supply-class ATHS vessels
Subsequent Event [Line Items]
Aggregate installment payment	1,000,000	1,000,000
Current Credit Facility
Subsequent Event [Line Items]
Credit facility expiration date		2018-06
Revolving credit facility	900,000,000	900,000,000
Credit facility term		5 years
Revolving line of credit		600,000,000
Term loan		300,000,000
Subsequent Event
Subsequent Event [Line Items]
Number of terminated contracts			3
Subsequent Event \| Troms Offshore Supply AS \| Notes Due April 2027
Subsequent Event [Line Items]
Debt instruments face amount				31,300,000		31,300,000		31,300,000
Debt instrument maturity, month and year				2027-04
Semi-annual principal payments				1,300,000
Debt instrument bearing floating interest rate				2.92%		2.92%		2.92%
Indebtedness rate				1.30%
Total capitalization rate				4.22%		4.22%		4.22%
Subsequent Event \| Deepwater PSVs
Subsequent Event [Line Items]
Aggregate installment payment				5,400,000	5,700,000	5,400,000		5,400,000
Aggregate estimated remaining cost					41,000,000
Number of vessels under construction					2	2
Significant commitment, new construction delivery date				Jun. 30, 2016	Jun. 30, 2016
Obligation to be relieved						21,700,000
Subsequent Event \| 7145 BHP towing-supply-class ATHS vessels
Subsequent Event [Line Items]
Number of Vessels, commitments							6
Number of terminated contracts							3
Aggregate installment payment							36,100,000
Aggregate estimated remaining cost							12,700,000
Subsequent Event \| Current Credit Facility
Subsequent Event [Line Items]
Credit facility expiration date								2019-06
Revolving credit facility				900,000,000		900,000,000		900,000,000
Credit facility term								5 years
Revolving line of credit								600,000,000
Term loan								$ 300,000,000