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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
1 Months Ended
Apr. 30, 2012
Sep. 30, 2013
Dec. 31, 2012
Mar. 21, 2012
Summary Of Significant Accounting Policies [Line Items]        
Percentage of ownership   100.00%    
Percentage of outstanding common stock acquired 100.00%      
Ownership interest percentage   20.00%    
Nonmarketable investments in TransUnion Corp   20.00%    
9.625% Senior notes
       
Summary Of Significant Accounting Policies [Line Items]        
9.625% Notes       $ 600,000,000.0
Interest rate on the notes 9.625% 9.625% 9.625% 9.625%
PIK rate percentage on notes 10.375%     10.375%
Due date Jun. 15, 2018