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Schedule of Amounts Due to Affiliate (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |
Beginning balance | $ 50,186 |
Ending balance | 48,803 |
Sonatide Marine, Ltd. |  |
Schedule of Equity Method Investments [Line Items] |  |
Beginning balance | 31,475 |
Plus additional commissions payable to Sonatide | 2,265 |
Plus amounts paid by Sonatide on behalf of the company | 4,843 |
Less amounts used to offset Due from Sonatide obligations | (8,145) | [1]
Other | (48) |
Ending balance | $ 30,390 |
[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.

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