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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2015 M | Mar. 31, 2014 | Mar. 31, 2013 | Jun. 30, 2013 | Jun. 04, 2013
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Extended useful life, months |  |  | 30 tdw_IncreaseOfAmortizationPeriod |  |  |  |  |  |  |  |
Inspection interval |  |  | The majority of the company's vessels require certification inspections twice in every five year period |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 283,699 us-gaap_Goodwill | [1],[2] | $ 297,822 us-gaap_Goodwill | [1] |  |  |
Goodwill impairment | 283,699 us-gaap_GoodwillImpairmentLoss | 56,283 us-gaap_GoodwillImpairmentLoss | 283,699 us-gaap_GoodwillImpairmentLoss | [2] | 56,283 us-gaap_GoodwillImpairmentLoss |  |  |  |  |  |
Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 42,200 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = tdw_TromsOffshoreSupplyAsMember | $ 42,160 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = tdw_TromsOffshoreSupplyAsMember | [3]
Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Highly liquid investments, maturities |  |  | 3 months |  |  |  |  |  |  |  |
Marine Equipment | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of salvage values |  |  | 10.00%us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_MarineEquipmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |
Marine Equipment | Maximum | From Date of Construction |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives, years |  |  | 25 years |  |  |  |  |  |  |  |
Marine Equipment | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of salvage values |  |  | 5.00%us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_MarineEquipmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |
Marine Equipment | Minimum | From Date of Construction |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives, years |  |  | 15 years |  |  |  |  |  |  |  |
Marine Equipment | Minimum | Regardless of Date Constructed |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives, years |  |  | 6 years |  |  |  |  |  |  |  |
Other Property Plant and Equipment | Maximum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives, years |  |  | 30 years |  |  |  |  |  |  |  |
Other Property Plant and Equipment | Minimum |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives, years |  |  | 3 years |  |  |  |  |  |  |  |
Stacked Vessels |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment average age |  |  | 20.7 tdw_PropertyPlantAndEquipmentAverageAge / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_StackedVesselsMember |  | 32.2 tdw_PropertyPlantAndEquipmentAverageAge / us-gaap_PropertyPlantAndEquipmentByTypeAxis = tdw_StackedVesselsMember |  |  |  |  |  |
[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] | Subsequently written off in December 2014.

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