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Schedule of Amounts Due from Affiliate (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]  
Beginning balance $ 125,972
Ending balance 128,204
Sonatide Marine, Ltd.  
Schedule of Equity Method Investments [Line Items]  
Beginning balance 89,246
Revenue earned by the company through Sonatide 11,812
Less amounts received from Sonatide (2,691)
Less amounts used to offset Due to Sonatide obligations (4,864) [1]
Other 1,455
Ending balance $ 94,958
[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.