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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     $ 283,699us-gaap_Goodwill [1] $ 297,822us-gaap_Goodwill [2] $ 297,822us-gaap_Goodwill [2]  
Goodwill acquired       42,160us-gaap_GoodwillAcquiredDuringPeriod [2]    
Impairments 283,699us-gaap_GoodwillImpairmentLoss 56,283us-gaap_GoodwillImpairmentLoss 283,699us-gaap_GoodwillImpairmentLoss [1] 56,283us-gaap_GoodwillImpairmentLoss    
Goodwill, Ending Balance   283,699us-gaap_Goodwill [2]   283,699us-gaap_Goodwill [2]    
Asia/Pacific            
Goodwill [Line Items]            
Goodwill, Beginning Balance       56,283us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_AsiaPacificSegmentMember		 56,283us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_AsiaPacificSegmentMember		  
Impairments 283,700us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_AsiaPacificSegmentMember		 56,300us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_AsiaPacificSegmentMember		   56,283us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_AsiaPacificSegmentMember		    
Americas            
Goodwill [Line Items]            
Goodwill, Beginning Balance     114,237us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_AmericasSegmentMember		     114,237us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_AmericasSegmentMember
Impairments     114,237us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_AmericasSegmentMember		      
Goodwill, Ending Balance   114,237us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_AmericasSegmentMember		   114,237us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_AmericasSegmentMember		   114,237us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_AmericasSegmentMember
Sub-Saharan Africa/Europe            
Goodwill [Line Items]            
Goodwill, Beginning Balance     169,462us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_SubSaharanAfricaAndEuropeMember		 127,302us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_SubSaharanAfricaAndEuropeMember		 127,302us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_SubSaharanAfricaAndEuropeMember		  
Goodwill acquired       42,160us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_SubSaharanAfricaAndEuropeMember		 42,200us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_SubSaharanAfricaAndEuropeMember		  
Impairments     169,462us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_SubSaharanAfricaAndEuropeMember		      
Goodwill, Ending Balance   $ 169,462us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= tdw_SubSaharanAfricaAndEuropeMember		   $ 169,462us-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.