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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 1 Months Ended
Jun. 30, 2013
Practice_Groups
Jul. 26, 2013
Subsequent Event [Member]
Medical Management Professionals Business [Member]
Summary Of Significant Accounting Policies [Line Items]    
Aggregate Purchase price consideration paid during transaction   $ 200
Proceeds after payment of Divestiture Of Operation   $ 145
Number of practice groups 3