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Schedule of Amounts Due from Affiliate (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Schedule Of Equity Method Investments [Line Items]  
Begining balance $ 132,951
Ending balance 119,049
Sonatide Marine, Ltd.  
Schedule Of Equity Method Investments [Line Items]  
Begining balance 109,176
Revenue earned by the company through Sonatide 15,387
Less amounts received from Sonatide (25,285)
Less amounts used to offset Due to Sonatide obligations (6,021) [1]
Other (1,055)
Ending balance $ 92,202
[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.