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Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) - Sales Revenue, Services, Net [Member] - Customer Concentration Risk [Member]	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Total S.A. [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	22.00%	13.00%	22.00%	14.00%
BP [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	15.00%	10.00%	15.00%	12.00%
Petrobras [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	11.00%	9.00%	10.00%	12.00%
ConocoPhillips [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	2.00%	23.00%	2.00%	15.00%
Concentration Risk excl Termination Fee, Percentage		3.00%		4.00%
Other Customers [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	50.00%	45.00%	51.00%	47.00%
Floaters [Member] | BP [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	79.00%	75.00%	79.00%	76.00%

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- Definition

Concentration Risk excl Termination Fee, Percentage

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-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
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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