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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, 2016
USD ($)
Vessel
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Vessel
Sep. 30, 2016
USD ($)
Vessel
Sep. 30, 2015
USD ($)
Vessel
Mar. 31, 2016
USD ($)
Vessel
Commitments and Contingencies Disclosure [Line Items]              
Vessel revenues   $ 139,361   $ 264,131 $ 301,791 $ 562,444  
Due from affiliate   300,757     300,757   $ 338,595
Investments in, at equity, and advances to unconsolidated companies   38,200     38,200   37,502
Due to affiliate   $ 175,925     $ 175,925   187,971
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%    
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 by way of addenda or extensions to the previously executed contracts.    
Due from affiliate and due to affiliate         $ 37,000   84,000
Proceeds from dividends received     $ 15,000        
Due from affiliate   $ 300,000     300,000   339,000
Unpaid vessel revenue   $ 95,000     $ 95,000    
Number of vessels operating | Vessel   7     7    
Number of vessels stacked | Vessel   3     3    
Investments in, at equity, and advances to unconsolidated companies   $ 38,000     $ 38,000   37,000
Due to affiliate   176,000     $ 176,000   188,000
Additional percentage of surcharges on foreign exchange transactions         10.00%    
Percentage of tax valued on all debit transactions         0.10%    
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   $ 8,000     8,000    
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         63,000   122,000
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to company              
Commitments and Contingencies Disclosure [Line Items]              
Proceeds from related party         $ 6,000   93,000
Sonatide joint venture | ANGOLA              
Commitments and Contingencies Disclosure [Line Items]              
Ownership percentage requirement of local vessel operators         100.00%    
Proceeds from related party         $ 69,000   215,000
Vessel revenues         $ 71,400 $ 124,000 $ 213,000
Percentage of Angolan operation revenue         24.00% 22.00%  
Number of vessels operating | Vessel   59   68 59 68  
Number of vessels stacked | Vessel   17   11 17 11  
Number of vessels transferred out of Angola | Vessel         17   23