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Allocation of Purchase Price for Acquisition (Detail) (USD $)
In Thousands, unless otherwise specified

Mar. 31, 2014

Mar. 31, 2013

Jun. 30, 2013

Jun. 04, 2013

Business Combination Allocation of Purchase Price [Line Items]

Goodwill

$ 283,699us-gaap_Goodwill

^[1],[2]

$ 297,822us-gaap_Goodwill

^[1]

Troms Offshore Supply AS

Business Combination Allocation of Purchase Price [Line Items]

Cash

22,263us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= tdw_TromsOffshoreSupplyAsMember

Trade receivables and other current assets

9,816us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= tdw_TromsOffshoreSupplyAsMember

Vessels

245,605us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= tdw_TromsOffshoreSupplyAsMember

^[3]

Goodwill

42,200us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= tdw_TromsOffshoreSupplyAsMember

42,160us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= tdw_TromsOffshoreSupplyAsMember

^[4]

Payable and other liabilities

(13,020)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= tdw_TromsOffshoreSupplyAsMember

Notes payable

(156,824)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= tdw_TromsOffshoreSupplyAsMember

Total purchase price

$ 150,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= tdw_TromsOffshoreSupplyAsMember

[1]	The total carrying amount of goodwill at December 31, 2013 is net of accumulated impairment charges $30.9 million and $56.3 million related to the Middle East/North Africa and Asia/Pacific segments, respectively.
[2]	The total carrying amount of goodwill at December 31, 2014 is net of accumulated impairment charges of $370.9 million.
[3]	Includes $10.7 million in costs attributed to vessels under construction.
[4]	Subsequently written off in December 2014.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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