Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Additional Information (Detail)

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BENEFIT PLANS - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions to retirement income plan   $ 17.8 $ 15.6 $ 14.6
Employer contribution rate to the 401(k) plan   6.00%    
Accumulated benefit obligation 697.5 697.5 710.3  
Accrued incentive compensations 90.7 90.7 66.5  
Defined benefit plan expected return   7.50%    
Difference between actual returns and expected returns rate over five years period 20.00% 20.00%    
Prohibited additional investing amounts     The Plan is prohibited from investing additional amounts in Equifax stock once the market value of stock held by each plan exceeds 10% of the total market value of each plan.  
Stock held by employee benefits trusts, shares 0.6 0.6 0.6  
Defined Benefit Plan, Target Allocation Percentage   25.00%    
Percentage Of Emplyees Received Lumb Sum Payament   64.00%    
Benefits paid   62.6    
Percentage Of Service Benefit Increased During Period   9.00%    
Defined Benefit Plan, Narrative Description of Basis Used to Determine Overall Expected Long-term Rate-of-Return on Assets Assumption   The market-related value of assets recognizes the difference between actual returns and expected returns over five years    
Pension Settlement Charge 38.7 38.7    
U.S. Retirement Income Plan, or USRIP
        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions to retirement income plan   0 40.0  
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, projected benefit obligation 650.5 650.5 697.4  
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation 642.2 642.2 669.1  
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets 494.1 494.1 535.8  
Pension Plans investment return   11.40%    
Number of Equifax common stock shares included in plan assets       0.4
Fair value of Equifax common stock shares included in plan assets       13.7
Defined Benefit Plan, Expected Return On Plan Assets Percentage   7.75%    
Canadian Retirement Income Plan, or CRIP
        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions to retirement income plan   3.7 2.6  
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, projected benefit obligation 66.3 66.3 48.7  
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation 55.3 55.3 41.2  
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets 53.9 53.9 47.2  
Pension Plans investment return   8.80%    
Defined Benefit Plan, Expected Return On Plan Assets Percentage   6.75%    
Pre-Medicare Coverage
        
Defined Benefit Plan Disclosure [Line Items]        
Initial annual rate increase in the per capita cost of of covered healthcare benefits   7.00%    
Ultimate annual rate decrease in the per capita cost of of covered healthcare benefits   5.00%    
Health care cost trend   An initial 7.0% annual rate of increase in the per capita cost of covered healthcare benefits was assumed for 2013 for pre-Medicare coverage. The rate was assumed to decrease gradually to an ultimate rate of 5.0% by 2017    
Post-Medicare Coverage
        
Defined Benefit Plan Disclosure [Line Items]        
Initial annual rate increase in the per capita cost of of covered healthcare benefits   7.00%    
Ultimate annual rate decrease in the per capita cost of of covered healthcare benefits   5.00%    
Health care cost trend   An initial 7.0% annual rate of increase in the per capita cost of covered healthcare benefits was assumed for 2012 for post-Medicare coverage. The rate was assumed to decrease gradually to an ultimate rate of 5.0% by 2017    
Trust for Benefit of Employees
        
Defined Benefit Plan Disclosure [Line Items]        
Stock held by employee benefits trusts, shares 0.6 0.6 0.6  
Shares of Equifax stock included in Employee Benefit Trusts at cost $ 5.9 $ 5.9 $ 5.9