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Segment Reporting - Revenues and Percentage of Consolidated Revenues (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue, Major Customer [Line Items] |  |  |
Revenues | $ 1,945,391 | $ 1,728,488 | $ 1,880,332
Customer Concentration Risk | Sales Revenue, Net | Royal Dutch Shell Plc |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues |  |  | $ 259,400
Percentage of consolidated revenues |  |  | 14.00%
Customer Concentration Risk | Sales Revenue, Net | BP plc [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | $ 195,000 | $ 195,000 | $ 183,000
Percentage of consolidated revenues | 11.00% | 11.00% | 10.00%

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