Equifax Inc. Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES (Additional Information) (Detail)

COMMITMENTS AND CONTINGENCIES (Additional Information) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Line Items]
Rental expense for operating leases	$ 22.6us-gaap_OperatingLeasesRentExpenseNet	$ 24.2us-gaap_OperatingLeasesRentExpenseNet	$ 21.5us-gaap_OperatingLeasesRentExpenseNet
Cash paid for data processing, outsourcing services and other agreements	50	60	70
Severance benefit term	In the event of a qualifying termination, the executive will become entitled to continuation of group health, dental, vision, life, disability, 401(k) and similar benefits for three years, as well as a lump sum severance payment, all of which differs by executive.
Potential Percentage Of Stock Acquired With Change In Control	any person acquires 20% or more of our voting stock
Qualifying termination, continuation of benefits for executives	3 years
Qualifying termination, continuation of benefits for executives, automatic renewal	3 years
Conditional payment for unrecognized severance benefit for key executives	56.5efx_ConditionalSeverancePayments
Assumed tax on expected payment for unrecognized severance benefit for key executives	31.8
Conditional payout percentage of target award	100.00%efx_ConditionalSharePayoutPercentage
Guarantees
Commitments and Contingencies Disclosure [Line Items]
Performance bonds and standby letters of credit remaining maturity date	one year or less.
Data Processing, Outsourcing Services And Other Agreements \| Minimum
Commitments and Contingencies Disclosure [Line Items]
Service agreements expiration year	2015
Estimated aggregate minimum contractual obligation	40
Data Processing, Outsourcing Services And Other Agreements \| Maximum
Commitments and Contingencies Disclosure [Line Items]
Service agreements expiration year	2023
Estimated aggregate minimum contractual obligation	60
IBM Operations Support Services Agreement
Commitments and Contingencies Disclosure [Line Items]
Service Agreements Expiration Term			2 years
Service agreements expiration date			Dec. 31, 2016
IBM Operations Support Services Agreement \| Minimum
Commitments and Contingencies Disclosure [Line Items]
Expected future year's minimum contractual obligation	15
IBM Operations Support Services Agreement \| Maximum
Commitments and Contingencies Disclosure [Line Items]
Expected future year's minimum contractual obligation	$ 25