Quarterly report pursuant to Section 13 or 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
 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2011
Jun. 30, 2012
USD ($)
Jun. 30, 2011
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2011
USD ($)
May 31, 2011
Maximum
USD ($)
Jun. 30, 2011
Boa Vista Servicos S.A.
USD ($)
Jun. 30, 2012
Boa Vista Servicos S.A.
USD ($)
Jun. 30, 2012
Boa Vista Servicos S.A.
BRL
May 31, 2011
Boa Vista Servicos S.A.
USD ($)
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")               $ 62.6 130.0 $ 82.3
Goodwill write-off               33.2    
Goodwill cumulative foreign translation adjustments       1.1       27.0    
Pre-tax loss related to merger included in other expense   2.2 (9.6) 3.6 (9.3)   10.3      
Tax expense             17.5      
Additional funding commitments period           May 31, 2013        
Additional funding agreed amount           $ 55        
Additional funding description Equifax has committed to make certain additional funding available to BVS. Until May 31, 2013, 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 will 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.                  
Debt maturity date May 31, 2015