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Schedule of Amounts Due to Affiliate (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]  
Beginning balance $ 50,186
Ending balance 50,013
Sonatide Marine, Ltd.  
Schedule of Equity Method Investments [Line Items]  
Beginning balance 31,475
Plus additional commissions payable to Sonatide 1,138
Plus amounts paid by Sonatide on behalf of the company 2,336
Less amounts used to offset Due from Sonatide obligations (4,864) [1]
Other 689
Ending balance $ 30,774
[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.