Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data - Additional Information (Detail)

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Quarterly Financial Data - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
May 31, 2011
Boa Vista Servicos S.A.
Apr. 30, 2010
US Consumer Information Solutions
APPRO Loan Origination Software
Jun. 30, 2010
US Consumer Information Solutions
APPRO Loan Origination Software
Jul. 31, 2010
US Consumer Information Solutions
Direct Marketing Services Division
Sep. 30, 2010
US Consumer Information Solutions
Direct Marketing Services Division
Quarterly Financial Information [Line Items]              
Percentage of interest acquired in Boa Vista Servicos S.A. ("BVS")     15.00%        
Proceeds received from divestitures $ 2.5 $ 181.7   $ 72.0 $ 72.0 $ 117.0 $ 117.0