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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Dec. 31, 2014	May 31, 2014	May 31, 2013
May 2014 Authorized Amount
Stockholders Equity Note [Line Items]
Amount authorized to repurchase shares		$ 200.0us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = tdw_MayTwoThousandFourteenAuthorizedAmountMember
Amount remaining to repurchase shares	100.0us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_ShareRepurchaseProgramAxis = tdw_MayTwoThousandFourteenAuthorizedAmountMember
May 2013 Authorized Amount
Stockholders Equity Note [Line Items]
Amount authorized to repurchase shares			$ 200.0us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = tdw_MayTwoThousandThirteenAuthorizedAmountMember
Number of shares repurchased	0us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = tdw_MayTwoThousandThirteenAuthorizedAmountMember

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

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