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Schedule of Amounts Due from Affiliate (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]    
Beginning balance   $ 125,972
Affiliate credit loss impairment expense $ (53,581) (53,581)
Ending balance 65,766 65,766
Sonatide Marine, Ltd.    
Schedule of Equity Method Investments [Line Items]    
Beginning balance   89,246
Revenue earned by the company through Sonatide   23,910
Less amounts received from Sonatide   (16,501)
Less amounts used to offset Due to Sonatide obligations [1]   (8,145)
Affiliate credit loss impairment expense   (41,500)
Other   343
Ending balance $ 47,353 $ 47,353
[1] We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture.