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Comparison of Total Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Mar. 31, 2014
Segment and Geographic Distribution of Operations [Line Items]
Assets	$ 4,716,626us-gaap_Assets		$ 4,885,829us-gaap_Assets
Investments in, at equity, and advances to unconsolidated companies	65,478us-gaap_EquityMethodInvestments		63,928us-gaap_EquityMethodInvestments
Operating Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets	4,130,961us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember		4,435,925us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments | Americas
Segment and Geographic Distribution of Operations [Line Items]
Assets	1,030,511us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_AmericasSegmentMember		1,017,736us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_AmericasSegmentMember
Operating Segments | Asia/Pacific
Segment and Geographic Distribution of Operations [Line Items]
Assets	434,398us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_AsiaPacificSegmentMember		421,379us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_AsiaPacificSegmentMember
Operating Segments | Middle East/North Africa
Segment and Geographic Distribution of Operations [Line Items]
Assets	652,806us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_MiddleEastAndNorthAfricaMember		613,303us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_MiddleEastAndNorthAfricaMember
Operating Segments | Sub-Saharan Africa/Europe
Segment and Geographic Distribution of Operations [Line Items]
Assets	2,013,246us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember		2,383,507us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember
Other
Segment and Geographic Distribution of Operations [Line Items]
Assets	52,728us-gaap_Assets / us-gaap_ConsolidationItemsAxis = tdw_OtherActivityMember		31,545us-gaap_Assets / us-gaap_ConsolidationItemsAxis = tdw_OtherActivityMember
Assets Before Equity Method Investments
Segment and Geographic Distribution of Operations [Line Items]
Assets	4,183,689us-gaap_Assets / us-gaap_ConsolidationItemsAxis = tdw_AssetsBeforeEquityMethodInvestmentsMember		4,467,470us-gaap_Assets / us-gaap_ConsolidationItemsAxis = tdw_AssetsBeforeEquityMethodInvestmentsMember
Assets Before Corporate Assets
Segment and Geographic Distribution of Operations [Line Items]
Assets	4,249,167us-gaap_Assets / us-gaap_ConsolidationItemsAxis = tdw_AssetsBeforeCorporateAssetsMember		4,531,398us-gaap_Assets / us-gaap_ConsolidationItemsAxis = tdw_AssetsBeforeCorporateAssetsMember
Corporate
Segment and Geographic Distribution of Operations [Line Items]
Assets	$ 467,459us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	[1]	$ 354,431us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	[1]
[1] Included in Corporate are vessels currently under construction which have not yet been assigned to a non-corporate reporting segment. A vessel's construction costs are reported in Corporate until the earlier of the date the vessels is assigned to a non-corporate reporting segment or the date it is delivered. At December 31, 2014 and March 31, 2014, $327.5 million and $228.9 million, respectively, of vessel construction costs are included in Corporate.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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