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Affiliates Balances - Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 22, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Vessel
Schedule of Equity Method Investments [Line Items]        
Dividend received by Sonangol company   $ 17,100    
Affiliate credit loss impairment expense     $ 53,581 $ 53,581
Sonatide Marine, Ltd.        
Schedule of Equity Method Investments [Line Items]        
Due from affiliate current net after offsetting due to affiliate $ 17,000   17,000 17,000
Cash 6,900   6,900 $ 6,900
Credit loss impairment expense 41,500      
Number of vessels operating | Vessel       2
Affiliate credit loss impairment expense       $ 41,500
Sonatide Marine, Ltd. | Angola, Kwanza        
Schedule of Equity Method Investments [Line Items]        
Cash 1,200   1,200 1,200
Sonatide Marine, Ltd. | Trade And Others Receivables [Member]        
Schedule of Equity Method Investments [Line Items]        
Net trade accounts receivable $ 18,600   $ 18,600 $ 18,600
DTDW (Neigeria)        
Schedule of Equity Method Investments [Line Items]        
Number of vessels operating | Vessel       1
Equity method ownership percentage 40.00%   40.00% 40.00%
Partners ownership Percentage 60.00%   60.00% 60.00%
Secured long-term debt $ 5,600   $ 5,600 $ 5,600
Affiliate credit loss impairment expense       12,100
Guarantor obligations, maximum exposure $ 2,000   $ 2,000 2,000
Sonatide Marine, Ltd.        
Schedule of Equity Method Investments [Line Items]        
Dividend declared       35,000
Written down of investments from joint venture       $ 0
Sonatide Marine, Ltd.        
Schedule of Equity Method Investments [Line Items]        
Dividend received by Sonangol company   $ 17,900