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Summary of Operations in Angola (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Vessel
Jun. 30, 2018
USD ($)
Vessel
Jun. 30, 2019
USD ($)
Vessel
Jun. 30, 2018
USD ($)
Vessel
Schedule Of Equity Method Investments [Line Items]        
Revenues of Angolan operations (in thousands) | $ $ 125,859 $ 105,601 $ 248,008 $ 197,094
ANGOLA        
Schedule Of Equity Method Investments [Line Items]        
Revenues of Angolan operations (in thousands) | $ $ 14,272 $ 14,550 $ 29,670 $ 28,719
Percent of consolidated vessel revenues 12.00% 14.00% 12.00% 15.00%
Number of company owned vessels in Angola | Vessel 32 37 34 38
Number of stacked company owned vessels in Angola | Vessel 13 16 14 17