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Segment Information, Geographical Data and Major Customers (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |
Additions to properties and equipment | $ 231,685 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | $ 397,458 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Sub-Saharan Africa/Europe | Troms Offshore Supply AS |  |
Segment Reporting Information [Line Items] |  |
Additions to properties and equipment |  | $ 245,600 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = tdw_TromsOffshoreSupplyAsMember / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Details
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Period Type: | duration

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- Details
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Data Type: | na
Balance Type: |
Period Type: |