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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

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