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Schedule of Amounts Due to Affiliate (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Schedule Of Equity Method Investments [Line Items]
Begining balance	$ 34,972
Ending balance	40,245
Sonatide Marine, Ltd.
Schedule Of Equity Method Investments [Line Items]
Begining balance	29,347
Plus commissions payable to Sonatide	1,475
Plus amounts paid by Sonatide on behalf of the company	5,364
Less amounts used to offset Due from Sonatide obligations	(6,037)	[1]
Other	(538)
Ending balance	$ 29,611
[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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-Topic 850
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