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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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