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Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 1 Months Ended 2 Months Ended
Jul. 26, 2013
Jul. 16, 2013
Westbury [Member]
    
Subsequent Event [Line Items]    
Percent of holding acquired under business purchase agreement 50.00%  
Number of share acquired under business purchase agreement 3,858  
Share Price Per Share Under Business Purchase Agreement   $ 6.65
Number of days moving average share price calculation   60 days
Option agreement date Sep. 14, 2010  
Purchase of common stock $ 7.25  
Common stock expiration date Sep. 30, 2013  
Medical Management Professionals Business [Member]
    
Subsequent Event [Line Items]    
Proceeds of business $ 145  
Disposal group business transferred amount under contractual arrangement $ 200