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Schedule of Goodwill by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Mar. 31, 2013
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill, Beginning Balance |  |  |  | $ 283,699 us-gaap_Goodwill | [1] | $ 297,822 us-gaap_Goodwill | [2] | $ 297,822 us-gaap_Goodwill | [2] |
Goodwill acquired |  |  |  |  |  | 42,160 us-gaap_GoodwillAcquiredDuringPeriod | [2] |  |  |
Impairments | 283,699 us-gaap_GoodwillImpairmentLoss | 56,283 us-gaap_GoodwillImpairmentLoss |  | 283,699 us-gaap_GoodwillImpairmentLoss | [1] | 56,283 us-gaap_GoodwillImpairmentLoss |  |  |  |
Goodwill, Ending Balance |  | 283,699 us-gaap_Goodwill | [2] |  |  | 283,699 us-gaap_Goodwill | [2] |  |  |
Asia/Pacific |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill, Beginning Balance |  |  |  |  |  | 56,283 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdw_AsiaPacificSegmentMember |  | 56,283 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdw_AsiaPacificSegmentMember |  |
Impairments | 283,700 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = tdw_AsiaPacificSegmentMember | 56,300 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = tdw_AsiaPacificSegmentMember |  |  |  | 56,283 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = tdw_AsiaPacificSegmentMember |  |  |  |
Americas |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill, Beginning Balance |  |  |  | 114,237 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdw_AmericasSegmentMember |  |  |  |  |  | 114,237 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdw_AmericasSegmentMember
Impairments |  |  |  | 114,237 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = tdw_AmericasSegmentMember |  |  |  |  |  |
Goodwill, Ending Balance |  | 114,237 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdw_AmericasSegmentMember |  |  |  | 114,237 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdw_AmericasSegmentMember |  |  |  | 114,237 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdw_AmericasSegmentMember
Sub-Saharan Africa/Europe |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill, Beginning Balance |  |  |  | 169,462 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember |  | 127,302 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember |  | 127,302 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember |  |
Goodwill acquired |  |  |  |  |  | 42,160 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember |  | 42,200 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember |  |
Impairments |  |  |  | 169,462 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember |  |  |  |  |  |
Goodwill, Ending Balance |  | $ 169,462 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember |  |  |  | $ 169,462 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = tdw_SubSaharanAfricaAndEuropeMember |  |  |  |
[1] | The total carrying amount of goodwill at December 31, 2014 is net of accumulated impairment charges of $370.9 million.
[2] | 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.

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