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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Mar. 31, 2015
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	70esv_TotalNumberOfContractDrillingRigs	[1]
Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	28esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember
Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	42esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember
North & South America (Excl. Brazil) [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	16esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = esv_NorthSouthAmericaExclBrazilMember	[1]
North & South America (Excl. Brazil) [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	9esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = esv_NorthSouthAmericaExclBrazilMember
North & South America (Excl. Brazil) [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	7esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = esv_NorthSouthAmericaExclBrazilMember
Brazil [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	4esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = country_BR	[1]
Brazil [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	4esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = country_BR
Brazil [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = country_BR
Europe & Mediterranean [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	12esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = esv_EuropeMediterraneanMember	[1]
Europe & Mediterranean [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	1esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = esv_EuropeMediterraneanMember
Europe & Mediterranean [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	11esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = esv_EuropeMediterraneanMember
Middle East & Africa [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	13esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember	[1]
Middle East & Africa [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	3esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember
Middle East & Africa [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	10esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember
Asia & Pacific Rim [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	11esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember	[1]
Asia & Pacific Rim [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	3esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember
Asia & Pacific Rim [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	8esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember
Asia & Pacific Rim (under construction) [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	5esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = esv_AsiaUnderConstructionMember	[1]
Asia & Pacific Rim (under construction) [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	3esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = esv_AsiaUnderConstructionMember
Asia & Pacific Rim (under construction) [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = esv_AsiaUnderConstructionMember
Middle East Under Construction Member [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = esv_MiddleEastUnderConstructionMemberMember	[1]
Middle East Under Construction Member [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = esv_MiddleEastUnderConstructionMemberMember
Middle East Under Construction Member [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = esv_MiddleEastUnderConstructionMemberMember
Discontinued Operations, Held-for-sale [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	7esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = us-gaap_DiscontinuedOperationsHeldforsaleMember	[1]
Discontinued Operations, Held-for-sale [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	5esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = us-gaap_DiscontinuedOperationsHeldforsaleMember
Discontinued Operations, Held-for-sale [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = us-gaap_DiscontinuedOperationsHeldforsaleMember
[1] We provide management services on six rigs owned by third-parties not included in the table above.

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