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Summary of Operations in Angola (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) Vessel | Jun. 30, 2019 USD ($) Vessel | Jun. 30, 2020 USD ($) Vessel | Jun. 30, 2019 USD ($) Vessel
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revenues of Angolan operations (in thousands) | $ | $ 102,344 | $ 125,859 | $ 218,712 | $ 248,008
ANGOLA |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revenues of Angolan operations (in thousands) | $ | $ 12,289 | $ 14,272 | $ 24,426 | $ 29,670
Percent of consolidated vessel revenues | 12.00% | 12.00% | 11.00% | 12.00%
Number of company owned vessels in Angola | Vessel | 26 | 32 | 27 | 34
Number of stacked company owned vessels in Angola | Vessel | 9 | 13 | 10 | 14

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