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Income Taxes (Narrative) (Details)	3 Months Ended
	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

X

- Definition

Consolidated effective income tax rate including tax expense attributable to prior periods.

+ References

No definition available.

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X

- 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

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