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Summary of Operations in Angola (Detail) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($) Vessel | Mar. 31, 2019 USD ($) Vessel
Schedule of Equity Method Investments [Line Items] |  |
Revenues of Angolan operations (in thousands) | $ | $ 116,368 | $ 122,149
ANGOLA |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues of Angolan operations (in thousands) | $ | $ 12,137 | $ 15,000
Percent of consolidated vessel revenues | 11.00% | 13.00%
Number of company owned vessels in Angola | Vessel | 28 | 35
Number of stacked company owned vessels in Angola | Vessel | 11 | 14

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