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Contingencies (Narrative) (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2016 USD ($) plaintiffs
Commitments and Contingencies Disclosure [Abstract] |
Loss Contingency, Number of Plaintiffs | 43
Loss Contingency, Claims Settled, Number | 58
Loss Contingency, Claims Settled Pending Documentation, Number | 10
Letters of Credit Outstanding, Amount | $ | $ 61.3

X
- Definition Loss Contingency, Claims Settled Pending Documentation, Number + References No definition available. + Details
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Namespace Prefix: | esv_
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Balance Type: | na
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Number of claims settled. + References No definition available. + Details
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Balance Type: | na
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- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
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