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Summary of Operations in Angola (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) Vessel | Sep. 30, 2018 USD ($) Vessel | Sep. 30, 2019 USD ($) Vessel | Sep. 30, 2018 USD ($) Vessel
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Revenues of Angolan operations (in thousands) | $ | $ 119,765 | $ 99,192 | $ 367,772 | $ 296,286
Number of company owned vessels in Angola |  |  | 220 |
ANGOLA |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Revenues of Angolan operations (in thousands) | $ | $ 11,534 | $ 15,154 | $ 41,194 | $ 43,874
Percent of consolidated vessel revenues | 10.00% | 16.00% | 11.00% | 15.00%
Number of company owned vessels in Angola | 31 | 36 | 33 | 38
Number of stacked company owned vessels in Angola | 14 | 16 | 14 | 16

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