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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2013
Practice_Groups
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Aug. 30, 2013
MMP [Member]
Jul. 26, 2013
MMP [Member]
Summary Of Significant Accounting Policies [Line Items]              
Number of practice groups 3            
Aggregate Purchase price consideration paid during transaction             $ 201,600,000
Number of Shares purchased from Westbury           3.85  
Percentage of Holding           50.00%  
Common stock, per share amount           $ 6.65  
Payment for acquisition of common stock 26,468,000 5,716,000 9,513,000     25,700,000  
Fees earned under administrative service agreement 140,200,000 116,100,000 109,100,000        
Intangible assets amortization period 8 years 3 months 18 days     2 years 15 years    
Software purchased or developed, estimated useful life 7 years            
Contract payment terms 90 days            
Total personnel costs 471,100,000 429,400,000 397,200,000        
Total occupancy costs $ 37,300,000 $ 36,400,000 $ 35,000,000        
Shares vesting term 4 years