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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Mar. 31, 2013
Apr. 30, 2012
9.625%/10.375% senior PIK toggle notes due 2018
Mar. 31, 2013
TransUnion Holding Company, Inc.
Apr. 30, 2012
TransUnion Holding Company, Inc.
Feb. 15, 2012
TransUnion Holding Company, Inc.
Apr. 30, 2012
TransUnion Holding Company, Inc.
9.625%/10.375% senior PIK toggle notes due 2018
Summary Of Significant Accounting Policies [Line Items]            
Outstanding Common Stock Acquired Percentage         100.00%  
9.625% Notes       $ 600.0   $ 600.0
Interest rate, due date           Jun. 15, 2018
Senior notes, interest rate   9.625%       10.375%
Direct owned subsidiary     100.00%      
Ownership interest 20.00%          
Nonmarketable investments in TransUnion Corp 20.00%