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Segment Reporting - Revenues and Percentage of Consolidated Revenues (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue, Major Customer [Line Items] |  |  |
Revenues | $ 1,880,332 | $ 2,328,569 | $ 2,450,382
Customer Concentration Risk | Sales Revenue, Net | Royal Dutch Shell Plc |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | $ 259,400 | $ 429,900 |
Percentage of consolidated revenues | 14.00% | 19.00% |
Customer Concentration Risk | Sales Revenue, Net | BG Group |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues |  |  | $ 263,400
Percentage of consolidated revenues |  |  | 11.00%
Customer Concentration Risk | Sales Revenue, Net | Petroleo Brasileiro SA |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues |  | $ 223,700 | $ 231,800
Percentage of consolidated revenues |  | 10.00% | 10.00%
Customer Concentration Risk | Sales Revenue, Net | BP Exploration Operating Co. Ltd. |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues | $ 183,000 |  |
Percentage of consolidated revenues | 10.00% |  |

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