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v2.4.1.9

Segment Information (Narrative) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2014 service segments contract
Segment Reporting Information [Line Items] |
Number of operating segments | 3 us-gaap_NumberOfOperatingSegments
Number of reportable segments | 2 us-gaap_NumberOfReportableSegments
Number of services | 1 esv_NumberOfServices
Number of drilling management contracts | 6 esv_NumberOfDrillingManagementContracts
Moored Semisubmersible Rigs [Member] |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs | 5
Jackup Rigs [Member] |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs | 42
Floaters [Member] |
Segment Reporting Information [Line Items] |
Number of drillships | 7 esv_NumberOfDrillships / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember
Floaters [Member] | Dynamically Positioned Semisubmersible [Member] |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs | 13
Floaters [Member] | Moored Semisubmersible Rigs [Member] |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs | 5
Floaters [Member] | Ultra-Deepwater [Member] |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs | 3
Jackups [Member] | Jackup Rigs [Member] |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs | 42
Jackups [Member] | Asset under Construction [Member] |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs | 4
Asia Pacific, Europe and Mediterranean, Middle East and Africa and North and South America [Member] | Jackups [Member] | Jackup Rigs [Member] |
Segment Reporting Information [Line Items] |
Number of contract drilling rigs | 38

X
- Definition Number Of Contract Drilling Rig + References No definition available. + Details
Name: | esv_NumberOfContractDrillingRigs
Namespace Prefix: | esv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Drilling Management Contracts + References No definition available. + Details
Name: | esv_NumberOfDrillingManagementContracts
Namespace Prefix: | esv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of drillships. + References No definition available. + Details
Name: | esv_NumberOfDrillships
Namespace Prefix: | esv_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Services + References No definition available. + Details
Name: | esv_NumberOfServices
Namespace Prefix: | esv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=esv_JackupRigsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=esv_MooredSemisubmersibleRigsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=esv_FloatersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=esv_JackupsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=esv_AsiaPacificEuropeAndMediterraneanMiddleEastAndAfricaAndNorthAndSouthAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |