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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
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Mar. 31, 2016
USD ($)
Vessel
Mar. 31, 2015
USD ($)
Vessel
Mar. 31, 2014
USD ($)
Commitments and Contingencies Disclosure [Line Items]            
Vessel revenues       $ 955,400 $ 1,468,358 $ 1,418,461
Due from affiliate       $ 338,595 $ 420,365  
Number of vessels operating | Vessel       253 263  
Investments in, at equity, and advances to unconsolidated companies       $ 37,502 $ 65,844 $ 63,928
Due to affiliate       187,971 185,657  
Commissions payable       $ 7,193 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%    
Agreement expiration date       2015-11    
Foreign receipt, exposure to risk, description       If the company is unable to reach agreement on a new split billing 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 split billing arrangements entered into with customers prior to the expiration of the consortium agreement remain in force.    
Proceeds from dividends received   $ 15,000 $ 10,000      
Due from affiliate and due to affiliate       $ 84,000    
Due from affiliate       339,000 420,000  
Unpaid vessel revenue       $ 97,000    
Number of vessels operating | Vessel       8    
Number of vessels stacked | Vessel       3    
Investments in, at equity, and advances to unconsolidated companies       $ 37,000 67,000  
Due to affiliate       188,000 186,000  
Commissions payable       $ 32,000 66,000  
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 | U.S Dollar Denominated            
Commitments and Contingencies Disclosure [Line Items]            
Bank deposits maintained       $ 3,000    
Sonatide joint venture | Angolan kwanza-denominated            
Commitments and Contingencies Disclosure [Line Items]            
Bank deposits maintained       119,000    
Sonatide joint venture | U.S. dollars initially received by Sonatide on behalf of the company or dollars collected from other customers            
Commitments and Contingencies Disclosure [Line Items]            
Proceeds from related party       122,000 159,000  
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to company            
Commitments and Contingencies Disclosure [Line Items]            
Proceeds from related party       $ 93,000 179,000  
Sonatide joint venture | ANGOLA            
Commitments and Contingencies Disclosure [Line Items]            
Ownership percentage requirement of local vessel operators       100.00%    
Proceeds from related party       $ 215,000 338,000  
Vessel revenues       $ 213,000 $ 351,000  
Percentage of Angolan operation revenue       22.00% 23.00%  
Number of vessels operating | Vessel       65 80  
Number of vessels stacked | Vessel       8 8  
Number of vessels transferred out of Angola | Vessel       23