XML 47 R59.htm IDEA: XBRL DOCUMENT v2.4.0.8
Acquisitions - Additional Information (Detail) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Business Acquisition, Contingent Consideration [Line Items]      
Goodwill $ 416,139,000   $ 384,697,000
Consideration paid in cash 2,300,000 4,100,000  
Common stock, shares issued 100,000    
Fair value of contingent consideration 3,600,000 1,100,000  
Number of common stock issued   200,000  
Associated Insurance Agents [Member]
      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash   3,700,000  
Contingent consideration   4,600,000  
Guaranteed future consideration   400,000  
Acquisition of Client Lists [Member]
      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash   300,000  
Contingent consideration   200,000  
Number of client list purchased   1  
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview) and Lewis Birch & Richardo, LLC (LBR) [Member]
      
Business Acquisition, Contingent Consideration [Line Items]      
Number of businesses acquired 5    
Consideration paid in cash 27,600,000    
CBIZ contingent consideration 14,000,000    
Consideration paid in common stock 2,800,000    
Contingent arrangements arising from acquisitions 15,400,000    
Contingent consideration 14,000,000    
Goodwill $ 31,925,000