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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Vessel
Jul. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Vessel
Jun. 30, 2018
USD ($)
Vessel
Jun. 30, 2017
USD ($)
Vessel
Mar. 31, 2017
USD ($)
Jun. 30, 2014
Vessel
Commitments And Contingencies Disclosure [Line Items]                
Due from affiliate   $ 197,059   $ 230,315 $ 197,059      
Due to affiliate   62,353   99,448 62,353      
Commissions payable [1]   2,488   1,898 2,488      
Total revenues   105,601   178,753 197,094      
Investments in, at equity, and advances to unconsolidated companies   1,335   29,216 1,335      
Cash and cash equivalents   459,286   $ 432,035 459,286      
Number of vessels operating | Vessel [2]       227        
Dividend received in excess of investment         4,900      
Vessel Revenues                
Commitments And Contingencies Disclosure [Line Items]                
Total revenues   $ 104,174   $ 171,884 $ 191,668      
ANGOLA                
Commitments And Contingencies Disclosure [Line Items]                
Number of vessels operating | Vessel   37     37     84
Decrease in number of vessels operating | Vessel   47     47      
Number of active vessels | Vessel   22     22     80
Decrease in number of active vessels | Vessel   58     58      
Devaluation Of Angolan kwanza Versus US Dollar                
Commitments And Contingencies Disclosure [Line Items]                
Foreign currency exchange rate   250   168 250      
Percentage of devaluation of currency         49.00%      
Percentage of foreign exchange loss recognized         49.00%      
Estimated exchange loss         $ 20,600      
Sonatide joint venture                
Commitments And Contingencies Disclosure [Line Items]                
Due from affiliate   $ 153,000   $ 230,000 153,000   $ 263,000  
Unpaid vessel revenue   25,000   44,000 25,000      
Due to affiliate   47,000   99,000 47,000   133,000  
Commissions payable   $ 30,200   36,400 30,200      
Due from affiliate and due to affiliate       $ 33,000 $ 55,000      
Ownership Interest In Joint Venture   49.00%   49.00% 49.00%      
Investments in, at equity, and advances to unconsolidated companies   $ 0   $ 27,000 $ 0   45,000  
Investment balance in difference between carrying value and net assets of the joint venture $ 28,000   $ 28,000          
Amortization period of basis difference equity method investments 10 years              
Dividend received         12,300      
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     19,000 20,000 47,000      
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to company                
Commitments And Contingencies Disclosure [Line Items]                
Proceeds from related party     3,000 1,000 4,000      
Sonatide joint venture | ANGOLA                
Commitments And Contingencies Disclosure [Line Items]                
Proceeds from related party     22,000 21,000 $ 51,000      
Total revenues     $ 34,000 $ 34,000     $ 127,000  
Percentage of Angolan operation revenue     23.00% 20.00% 15.00% 20.00% 22.00%  
"Number of vessels transferred out of Angola | Vessel"     3 3 8   22  
Number of vessels operating | Vessel   38     38 53    
Number of vessels stacked | Vessel   17     17 23    
Sonatide joint venture | ANGOLA | Vessel Revenues                
Commitments And Contingencies Disclosure [Line Items]                
Total revenues         $ 29,000 $ 53,000    
Sonatide joint venture | Angolan kwanza-denominated                
Commitments And Contingencies Disclosure [Line Items]                
Bank deposits maintained   $ 67,000   $ 81,000 67,000      
Cash and cash equivalents   $ 43,000     $ 43,000      
[1] Excludes $30.2 million and $36.4 million of commissions due to Sonatide at June 30, 2018 and December 31, 2017, respectively. These amounts are included in amounts due to affiliates.
[2] Vessel count excludes vessels operated under sale leaseback agreements.