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Comparison of Total Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Mar. 31, 2014
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Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | $ 4,716,626 us-gaap_Assets |  | $ 4,885,829 us-gaap_Assets |
Investments in, at equity, and advances to unconsolidated companies | 65,478 us-gaap_EquityMethodInvestments |  | 63,928 us-gaap_EquityMethodInvestments |
Operating Segments |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | 4,130,961 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |  | 4,435,925 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |
Operating Segments | Americas |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | 1,030,511 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_AmericasSegmentMember |  | 1,017,736 us-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 | 434,398 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_AsiaPacificSegmentMember |  | 421,379 us-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 | 652,806 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_MiddleEastAndNorthAfricaMember |  | 613,303 us-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 | 2,013,246 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember |  | 2,383,507 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember |
Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | 52,728 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = tdw_OtherActivityMember |  | 31,545 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = tdw_OtherActivityMember |
Assets Before Equity Method Investments |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | 4,183,689 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = tdw_AssetsBeforeEquityMethodInvestmentsMember |  | 4,467,470 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = tdw_AssetsBeforeEquityMethodInvestmentsMember |
Assets Before Corporate Assets |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | 4,249,167 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = tdw_AssetsBeforeCorporateAssetsMember |  | 4,531,398 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = tdw_AssetsBeforeCorporateAssetsMember |
Corporate |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | $ 467,459 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | [1] | $ 354,431 us-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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