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Fair Value Measurements - Concentration of Credit Risk (Details) - Customer Concentration Risk [Member] | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Deepwater Segment [Member] | Anadarko [Member] | Accounts Receivable [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage | 0.00% |  | 0.00%
Deepwater Segment [Member] | Anadarko [Member] | Sales Revenue, Services, Net [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage | 0.00% | 24.00% |
Deepwater Segment [Member] | BP Trinidad and Tobago [Member] | Sales Revenue, Services, Net [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage | 12.00% | 5.00% |
Jack-ups and Unallocated and Other [Member] | ARO Drilling [Member] | Accounts Receivable [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage | 27.00% |  | 30.00%
Jack-ups and Unallocated and Other [Member] | ARO Drilling [Member] | Sales Revenue, Services, Net [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage | 27.00% | 11.00% |
Jack-ups [Member] | Saudi Aramco [Member] | Accounts Receivable [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage | 21.00% |  | 21.00%
Jack-ups [Member] | Saudi Aramco [Member] | Sales Revenue, Services, Net [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage | 0.00% | 35.00% |
Jack-ups [Member] | Lundin [Member] | Accounts Receivable [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage | 0.00% |  | 0.00%
Jack-ups [Member] | Lundin [Member] | Sales Revenue, Services, Net [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage | 0.00% | 10.00% |
Jack-ups [Member] | BP Trinidad and Tobago [Member] | Accounts Receivable [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage | 8.00% |  | 9.00%

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