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Summary of Norwegian Kroner (NOK) Denominated Borrowings Outstanding (Detail) In Thousands, unless otherwise specified	Dec. 31, 2014 3.81% January 2014 notes USD ($)	Dec. 31, 2014 3.81% January 2014 notes NOK	Mar. 31, 2014 3.81% January 2014 notes USD ($)	Mar. 31, 2014 3.81% January 2014 notes NOK	Dec. 31, 2014 5.38% May 2012 notes USD ($)	Dec. 31, 2014 5.38% May 2012 notes NOK	Mar. 31, 2014 5.38% May 2012 notes USD ($)	Mar. 31, 2014 5.38% May 2012 notes NOK	Dec. 31, 2014 Variable rate borrowings, June 2013 borrowing agreement USD ($)		Dec. 31, 2014 Variable rate borrowings, June 2013 borrowing agreement NOK		Mar. 31, 2014 Variable rate borrowings, June 2013 borrowing agreement USD ($)		Mar. 31, 2014 Variable rate borrowings, June 2013 borrowing agreement NOK		Dec. 31, 2014 Variable rate borrowings, May 2012 borrowing agreement USD ($)		Dec. 31, 2014 Variable rate borrowings, May 2012 borrowing agreement NOK		Mar. 31, 2014 Variable rate borrowings, May 2012 borrowing agreement USD ($)		Mar. 31, 2014 Variable rate borrowings, May 2012 borrowing agreement NOK
Debt [Line Items]
Long-term debt outstanding	$ 38,575us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NotesPayableOneMember	287,500us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NotesPayableOneMember	$ 50,028us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NotesPayableOneMember	300,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NotesPayableOneMember	$ 21,720us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NotesPayableTwoMember	161,880us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NotesPayableTwoMember	$ 29,867us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NotesPayableTwoMember	178,920us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NotesPayableTwoMember	$ 3,354us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_BorrowingOneMember	[1]	25,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_BorrowingOneMember	[1]	$ 4,168us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_BorrowingOneMember	[1]	25,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_BorrowingOneMember	[1]	$ 2,683us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_BorrowingTwoMember	[1]	20,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_BorrowingTwoMember	[1]	$ 5,837us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_BorrowingTwoMember	[1]	35,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_BorrowingTwoMember	[1]
Fair value in U.S. dollar equivalent (Level 2)	$ 38,581us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = tdw_NotesPayableOneMember		$ 50,044us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = tdw_NotesPayableOneMember		$ 21,634us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = tdw_NotesPayableTwoMember		$ 29,588us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = tdw_NotesPayableTwoMember
[1] Fair values approximate carrying values because the borrowings bear interest at variable rates.

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/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611

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X

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. 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/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Paragraph 1

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



Reference 3: http://www.xbrl.org/2003/role/presentationRef

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

-Section S99

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