Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2012
Jan. 31, 2013
Jun. 30, 2012
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2012    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY    
Trading Symbol EFX    
Entity Registrant Name EQUIFAX INC    
Entity Central Index Key 0000033185    
Current Fiscal Year End Date --12-31    
Entity Well Known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock Shares Outstanding   120,452,130  
Entity Public Float     $ 5,584,579,835