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Disclosure of Accounted Total Revenues Percentage (Detail) - Sales Revenue, Net - Customer Concentration Risk | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Chevron Corporation |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |
Total revenue percentage | 17.50% | 17.40% | 13.00% | 15.00%
Saudi Aramco |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |
Total revenue percentage | 11.70% | 10.10% | 7.60% | 8.30%

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