Annual report pursuant to Section 13 and 15(d)

MERGER OF BRAZILIAN BUSINESS - Additional Information (Detail)

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MERGER OF BRAZILIAN BUSINESS - Additional Information (Detail)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Jun. 30, 2011
Boa Vista Servicos S.A.
USD ($)
Dec. 31, 2011
Boa Vista Servicos S.A.
USD ($)
Dec. 31, 2011
Boa Vista Servicos S.A.
BRL
May 31, 2011
Boa Vista Servicos S.A.
USD ($)
May 31, 2011
General Corporate Purposes
May 31, 2011
General Corporate Purposes
Maximum
USD ($)
Business Acquisition [Line Items]                  
Percentage of interest acquired in Boa Vista Servicos S.A. ("BVS")             15.00%    
Investment in Boa Vista Servicos S.A. ("BVS")         $ 69.4 130.0 $ 82.3    
Goodwill write-off 33.2 79.5     33.2        
Goodwill cumulative translation adjustments 3.9 5.0     27.0        
Pre-tax loss related to merger included in other expense (7.7) 1.3 6.2 10.3          
Tax expense         17.5        
Additional funding commitments period                 May 31, 2015
Additional funding agreed amount                 $ 55
Additional funding description               Equifax has committed to make certain additional funding available to BVS. Until May 31, 2015, BVS will have the right to borrow up to $55 million from Equifax for general corporate purposes; any borrowings would be due and payable on May 31, 2015. Payments for principal and interest on any borrowings can be convertible, at Equifax’s option, into additional shares of BVS nonvoting preferred stock. Preferred shares issued as a result of any borrowings will be convertible to common shares under specific conditions.