Annual report pursuant to Section 13 and 15(d)

DISCONTINUED OPERATIONS (Additional Information) (Detail)

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DISCONTINUED OPERATIONS (Additional Information) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
business_line
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of non-strategic business lines divested 2efx_NumberofBusinessLinesDivestedDiscontinuedOperations      
Proceeds From Divestiture Of Businesses $ 47.5us-gaap_ProceedsFromDivestitureOfBusinesses $ 0.6us-gaap_ProceedsFromDivestitureOfBusinesses $ 47.5us-gaap_ProceedsFromDivestitureOfBusinesses $ 2.5us-gaap_ProceedsFromDivestitureOfBusinesses
Revenue from discontinued operations     9.3us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue 87.5us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Pretax income from discontinued operations     0.5us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax 8.9us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Gain on divestitures 18.4us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax      
Income tax benifits from disposals 18.1us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation      
Discontinued Operation Income Loss From Discontinued Operation Income Tax Benefit Current 14.3efx_DiscontinuedOperationsIncomeLossFromDiscontinuedOperationIncomeTaxBenefiTcurrent      
Talent Management Services | Workforce Solutions        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Escrow Receivable From Sale Of Business $ 3.5efx_EscrowReceivableFromSalesOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= efx_TalentManagementServicesMember
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceSolutionsMember