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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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Petrobras [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	15.00%	10.00%	13.00%	10.00%
Total S.A. [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	10.00%	8.00%	9.00%	10.00%
Anadarko [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	5.00%	10.00%	5.00%	11.00%
BP [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	16.00%	17.00%	14.00%	17.00%
BP [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	79.00%	81.00%	82.00%	80.00%
Other Customers [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	54.00%	55.00%	59.00%	52.00%

X

- 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=51801978&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=49121117&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=51801978&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=49121117&loc=d3e13537-108611

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