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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2013
Sep. 30, 2015
USD ($)
Vessel
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Vessel
Sep. 30, 2015
USD ($)
Vessel
Sep. 30, 2014
USD ($)
Vessel
Mar. 31, 2015
USD ($)
Vessel
Mar. 31, 2014
USD ($)
Commitments and Contingencies Disclosure [Line Items]                
Foreign receipt, exposure to risk, description         If the company is unable to reach agreement on a new split payment arrangement, any contract entered into after the expiration of the consortium agreement would result in the receipt of 100% Angolan kwanzas, which would be subject to the challenges and risks described above. The company believes that the split payment contracts entered into with customers prior to the expiration of the consortium agreement will remain in force until their expirations.      
Vessel revenues   $ 264,131   $ 390,952 $ 562,444 $ 772,462    
Other operating revenues   7,792   $ 6,572 14,253 10,739    
Due from affiliate   346,884     346,884   $ 420,365  
Investments in, at equity, and advances to unconsolidated companies   59,420     59,420   65,844  
Due to affiliate   165,945     165,945   185,657  
Commissions payable [1]   $ 7,203     $ 7,203   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%     49.00%      
Proceeds from dividends received     $ 10,000          
Other operating revenues         $ 71,000      
Due from affiliate   $ 346,000     $ 346,000   420,000  
Number of vessels operating | Vessel   8     8      
Number of vessels stacked | Vessel   3     3      
Investments in, at equity, and advances to unconsolidated companies   $ 59,000     $ 59,000     $ 67,000
Due to affiliate   166,000     166,000   186,000  
Commissions payable   23,000     23,000   66,000  
Sonatide joint venture | Angolan kwanza-denominated                
Commitments and Contingencies Disclosure [Line Items]                
Bank deposits maintained   98,000     98,000      
Sonatide joint venture | U.S Dollar Denominated                
Commitments and Contingencies Disclosure [Line Items]                
Bank deposits maintained   $ 31,000     31,000      
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         112,000   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         83,000   179,000  
Sonatide joint venture | ANGOLA                
Commitments and Contingencies Disclosure [Line Items]                
Proceeds from related party         195,000   338,000  
Vessel revenues         $ 124,000 $ 179,000 $ 351,000  
Percentage of Angolan operation revenue         22.00% 23.00%    
Number of vessels operating | Vessel   68   83 68 83    
Number of vessels stacked | Vessel   11   5 11 5    
Ownership percentage requirement of local vessel operators         100.00%      
Number of vessels transferred out of Angola | Vessel             13  
Number of vessels stacked transferred | Vessel   16     16      
[1] Excludes $22.6 million and $46.3 million of commissions due to Sonatide at September 30, 2015 and March 31, 2015, respectively. These amounts are included in amounts due to affiliate.