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Schedule of Gain on Disposition of Assets (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2015 Vessel | Mar. 31, 2014 Vessel | Mar. 31, 2013 Vessel
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on vessels disposed | $ 4,275 us-gaap_GainLossOnDispositionOfAssets | $ (1,537)us-gaap_GainLossOnDispositionOfAssets | $ 3,590 us-gaap_GainLossOnDispositionOfAssets | $ 2,943 us-gaap_GainLossOnDispositionOfAssets | $ 2,363 us-gaap_GainLossOnDispositionOfAssets | $ 7,170 us-gaap_GainLossOnDispositionOfAssets | $ 49 us-gaap_GainLossOnDispositionOfAssets | $ 2,140 us-gaap_GainLossOnDispositionOfAssets | $ 9,271 us-gaap_GainLossOnDispositionOfAssets | $ 11,722 us-gaap_GainLossOnDispositionOfAssets | $ 6,609 us-gaap_GainLossOnDispositionOfAssets
Number of vessels disposed |  |  |  |  |  |  |  |  | 13 tdw_NumberOfVesselsSoldOrScrapped | 48 tdw_NumberOfVesselsSoldOrScrapped | 32 tdw_NumberOfVesselsSoldOrScrapped
Vessels |  |  |  |  |  |  |  |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on vessels disposed |  |  |  |  |  |  |  |  | $ 2,988 us-gaap_GainLossOnDispositionOfAssets / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_VesselsMember | $ 12,247 us-gaap_GainLossOnDispositionOfAssets / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_VesselsMember | $ 12,191 us-gaap_GainLossOnDispositionOfAssets / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_VesselsMember

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- Definition Number of Vessels Sold or Scrapped + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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