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Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) - Sales Revenue, Services, Net | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Customer Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 100.00% | 100.00% | 100.00% | 100.00%
Customer Concentration Risk | Total S.A. |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 14.00% | 24.00% | 14.00% | 23.00%
Customer Concentration Risk | Total S.A. [Member] [Domain] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 11.00% | 10.00% | 10.00% | 9.00%
Customer Concentration Risk | BP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 5.00% | 15.00% | 7.00% | 15.00%
Customer Concentration Risk | Petrobras |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 5.00% | 11.00% | 9.00% | 11.00%
Customer Concentration Risk | Other |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 65.00% | 40.00% | 60.00% | 42.00%
Floaters | Customer Concentration Risk | BP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage |  | 78.00% | 33.00% | 78.00%
Jackups | Customer Concentration Risk | BP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 27.00% |  | 18.00% |
US Gulf Of Mexico | Floaters | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 35.00% | 21.00% | 36.00% | 24.00%
US Gulf Of Mexico | Jackups | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 39.00% | 35.00% | 38.00% | 37.00%

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