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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2013
Jun. 30, 2015
USD ($)
Vessel
Dec. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
Vessel
Mar. 31, 2015
USD ($)
Vessel
Mar. 31, 2014
USD ($)
Commitments and Contingencies Disclosure [Line Items]            
Vessel revenues   $ 298,313   $ 381,510    
Other operating revenues   6,461   4,167    
Investments in, at equity, and advances to unconsolidated companies   62,701     $ 65,844  
Commissions payable   $ 6,288     8,282  
Minimum            
Commitments and Contingencies Disclosure [Line Items]            
Additional percentage of surcharges on foreign exchange transactions   10.00%        
Maximum            
Commitments and Contingencies Disclosure [Line Items]            
Expected time period to deliver the new build vessels   2 years        
Sonatide joint venture            
Commitments and Contingencies Disclosure [Line Items]            
Definitive joint venture agreement term 2 years          
Ownership Interest In Joint Venture   49.00%        
Proceeds from related party         338,000  
Proceeds from dividends received     $ 10,000      
Other operating revenues   $ 33,000        
Due from related parties   $ 385,000        
Number of vessels operating | Vessel   8        
Number of vessels stacked | Vessel   2        
Investments in, at equity, and advances to unconsolidated companies   $ 62,000       $ 67,000
Sonatide joint venture | Dollars held by Sonatide that did not need to be converted to U.S dollars prior to payment to Tidewater            
Commitments and Contingencies Disclosure [Line Items]            
Proceeds from related party   49,000     159,000  
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to Tidewater            
Commitments and Contingencies Disclosure [Line Items]            
Proceeds from related party   52,000     179,000  
Sonatide joint venture | Angolan kwanza-denominated            
Commitments and Contingencies Disclosure [Line Items]            
Bank deposits maintained   111,000        
Sonatide joint venture | U.S Dollar Denominated            
Commitments and Contingencies Disclosure [Line Items]            
Bank deposits maintained   30,000        
Sonatide joint venture | ANGOLA            
Commitments and Contingencies Disclosure [Line Items]            
Proceeds from related party   101,000        
Vessel revenues   $ 68,000   $ 87,000 $ 351,000  
Percentage of Angolan operation revenue   23.00%   23.00%    
Number of vessels operating | Vessel   70   83    
Number of vessels stacked | Vessel   7   4    
Ownership percentage requirement of local vessel operators   100.00%        
Number of vessels transferred out of Angola | Vessel         13  
Number of vessels stacked transferred | Vessel   4        
Sonatide joint venture | Trade and other receivables            
Commitments and Contingencies Disclosure [Line Items]            
Due from related parties   $ 385,000     $ 420,000  
Sonatide joint venture | Accrued expenses            
Commitments and Contingencies Disclosure [Line Items]            
Due to related parties   192,000     186,000  
Commissions payable   $ 41,000     $ 66,000