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v2.4.1.9

Income Taxes (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |
Consolidated effective income tax rate including tax expense attributable to prior periods | 19.10%esv_ConsolidatedEffectiveIncomeTaxRateIncludingTaxExpenseAttributableToPriorPeriods | 14.20%esv_ConsolidatedEffectiveIncomeTaxRateIncludingTaxExpenseAttributableToPriorPeriods
Effective Income Tax Rate Reconciliation, Percent | 17.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 10.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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