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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, 2016
USD ($)
Vessel
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Vessel
Mar. 31, 2016
USD ($)
Vessel
Commitments and Contingencies Disclosure [Line Items]          
Vessel revenues   $ 162,430   $ 298,313  
Due from affiliate   341,966     $ 338,595
Investments in, at equity, and advances to unconsolidated companies   36,989     37,502
Due to affiliate   197,289     187,971
Commissions payable [1]   $ 6,840     7,193
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.      
Due from affiliate and due to affiliate   $ 13,000     84,000
Proceeds from dividends received     $ 15,000    
Due from affiliate   342,000     339,000
Unpaid vessel revenue   $ 95,000      
Number of vessels operating | Vessel   8      
Number of vessels stacked | Vessel   4      
Investments in, at equity, and advances to unconsolidated companies   $ 37,000     37,000
Due to affiliate   197,000     188,000
Commissions payable   $ 52,000     32,000
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   $ 117,000      
Sonatide joint venture | U.S Dollar Denominated          
Commitments and Contingencies Disclosure [Line Items]          
Bank deposits maintained   3,000      
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   16,000     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   $ 11,000     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   $ 27,000     215,000
Vessel revenues   $ 39,000   $ 68,000 $ 213,000
Percentage of Angolan operation revenue   24.00%   23.00%  
Number of vessels operating | Vessel   60   70  
Number of vessels stacked | Vessel   16   7  
Number of vessels transferred out of Angola | Vessel   13     23
[1] Excludes $51.8 million and $31.6 million of commissions due to Sonatide at June 30, 2016 and March 31, 2016, respectively. These amounts are included in amounts due to affiliate.