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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2013
Dec. 31, 2015
USD ($)
Vessel
Dec. 31, 2014
USD ($)
Vessel
Dec. 31, 2015
USD ($)
Vessel
Dec. 31, 2014
USD ($)
Vessel
Mar. 31, 2015
USD ($)
Vessel
Commitments and Contingencies Disclosure [Line Items]            
Vessel revenues   $ 212,908 $ 378,126 $ 775,352 $ 1,150,588  
Other operating revenues   5,283 9,428 19,536 20,167  
Due from affiliate   336,474   336,474   $ 420,365
Investments in, at equity, and advances to unconsolidated companies   45,663   45,663   65,844
Due to affiliate   169,943   169,943   185,657
Commissions payable [1]   $ 7,197   $ 7,197   8,282
Sonatide joint venture            
Commitments and Contingencies Disclosure [Line Items]            
Definitive joint venture agreement term 2 years     1 year    
Ownership Interest In Joint Venture   49.00%   49.00%    
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 may 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.    
Agreement expiration date       2015-11    
Proceeds from dividends received   $ 15,000 $ 10,000      
Other operating revenues       $ 10,000    
Due from affiliate and due to affiliate       65,000    
Due from affiliate   $ 336,000   $ 336,000   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   $ 43,000   $ 43,000   67,000
Due to affiliate   170,000   170,000   186,000
Commissions payable   27,000   $ 27,000   66,000
Sonatide joint venture | Minimum            
Commitments and Contingencies Disclosure [Line Items]            
Additional percentage of surcharges on foreign exchange transactions       10.00%    
Sonatide joint venture | Maximum            
Commitments and Contingencies Disclosure [Line Items]            
Expected time period to deliver the new build vessels       2 years    
Sonatide joint venture | Angolan kwanza-denominated            
Commitments and Contingencies Disclosure [Line Items]            
Bank deposits maintained   95,000   $ 95,000    
Sonatide joint venture | U.S Dollar Denominated            
Commitments and Contingencies Disclosure [Line Items]            
Bank deposits maintained   $ 1,000   1,000    
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       93,000   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       $ 89,000   179,000
Sonatide joint venture | ANGOLA            
Commitments and Contingencies Disclosure [Line Items]            
Ownership percentage requirement of local vessel operators       100.00%    
Proceeds from related party       $ 182,000   338,000
Vessel revenues       $ 172,000 $ 271,000 $ 351,000
Percentage of Angolan operation revenue       22.00% 23.00%  
Number of vessels operating | Vessel   66 83 66 83  
Number of vessels stacked | Vessel   8 4 8 4  
Number of vessels transferred out of Angola | Vessel           13
Number of vessels stacked transferred | Vessel   18   18    
[1] Excludes $27.3 million and $46.3 million of commissions due to Sonatide at December 31, 2015 and March 31, 2015, respectively. These amounts are included in amounts due to affiliate.