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Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) - Sales Revenue, Services, Net | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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 | 13.00% | 22.00% | 14.00% | 22.00%
Customer Concentration Risk | BP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 5.00% | 15.00% | 8.00% | 15.00%
Customer Concentration Risk | Petrobras |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 10.00% | 11.00% | 11.00% | 10.00%
Customer Concentration Risk | Other |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 72.00% | 52.00% | 67.00% | 53.00%
Floaters | Customer Concentration Risk | BP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 28.00% | 79.00% | 43.00% | 79.00%
Jackups | Customer Concentration Risk | BP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage |  |  | 15.00% |
US Gulf Of Mexico | Floaters | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 36.00% | 10.00% |  | 25.00%
US Gulf Of Mexico | Jackups | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 39.00% | 46.00% |  | 37.00%

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