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Schedule of Amounts Due from Affiliate (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($)
Schedule Of Equity Method Investments [Line Items] |  |
Begining balance | $ 132,951 |
Ending balance | 121,959 |
Sonatide Marine, Ltd. |  |
Schedule Of Equity Method Investments [Line Items] |  |
Begining balance | 109,176 |
Revenue earned by the company through Sonatide | 29,650 |
Less amounts received from Sonatide | (35,699) |
Less amounts used to offset Due to Sonatide obligations | (7,982) | [1]
Other | (1,005) |
Ending balance | $ 94,140 |
[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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