XML 117 R103.htm IDEA: XBRL DOCUMENT v3.3.1.900
Acquisitions - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Client_List
shares
Dec. 31, 2014
USD ($)
Client_List
shares
Dec. 31, 2013
USD ($)
Client_List
Business
shares
Business Acquisition, Contingent Consideration [Line Items]      
Goodwill $ 447,685 $ 435,231 $ 384,697
Consideration paid in cash $ 12,000 $ 4,600 $ 10,100
Number of common stock issued | shares 300,000 100,000 200,000
Fair value of contingent consideration $ 2,900 $ 3,900 $ 1,100
Model Consulting, Inc. (Model),Pension Resource Group, Inc. (PRG),Cottonwood Group, Inc. (Cottonwood)[Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash 10,500    
Consideration paid in common stock 1,400    
Contingent consideration 8,500    
Contingent arrangements arising from acquisitions 8,700    
Goodwill 13,471    
Model Consulting, Inc. (Model),Pension Resource Group, Inc. (PRG),Cottonwood Group, Inc. (Cottonwood)[Member] | Contingent Purchase Price Liability Current [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration 2,900    
Model Consulting, Inc. (Model),Pension Resource Group, Inc. (PRG),Cottonwood Group, Inc. (Cottonwood)[Member] | Contingent Purchase Price Liability Non-current [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration 5,600    
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview),Tegrit Group(Tegrit), Sattler Insurance Agency (Sattler) and Lewis Birch & Richardo, LLC (LBR) [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration   19,400  
Contingent arrangements arising from acquisitions   20,900  
Goodwill   51,873  
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview),Tegrit Group(Tegrit), Sattler Insurance Agency (Sattler) and Lewis Birch & Richardo, LLC (LBR) [Member] | Contingent Purchase Price Liability Current [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration   5,000  
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview),Tegrit Group(Tegrit), Sattler Insurance Agency (Sattler) and Lewis Birch & Richardo, LLC (LBR) [Member] | Contingent Purchase Price Liability Non-current [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration   14,400  
Associated Insurance Agents (AIA), Minneapolis, Minnesota and Knight Field Fabry LLP (Knight) [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash     4,900
Contingent consideration     5,500
Contingent arrangements arising from acquisitions     6,100
Goodwill     9,278
Guaranteed future consideration     $ 400
Number of businesses acquired | Business     2
CBIZ contingent consideration     $ 5,500
Goodwill deductible for tax purposes     1,400
Associated Insurance Agents (AIA), Minneapolis, Minnesota and Knight Field Fabry LLP (Knight) [Member] | Contingent Purchase Price Liability Current [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration     1,200
Associated Insurance Agents (AIA), Minneapolis, Minnesota and Knight Field Fabry LLP (Knight) [Member] | Contingent Purchase Price Liability Non-current [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration     4,300
Acquisition of Client Lists [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash 2,800 1,000 300
Contingent consideration 100 $ 200 $ 300
Number of client list purchased | Client_List   4 3
Guaranteed future consideration $ 800    
Lewis Birch & Richardo, LLC [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Consideration paid in cash   $ 43,900  
Consideration paid in common stock   2,900  
Contingent consideration   $ 19,400  
Employee Services [Member] | Acquisition of Client Lists [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Number of client list purchased | Client_List 6 1 2
Financial Services Practice Group [Member] | Acquisition of Client Lists [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Number of client list purchased | Client_List   3 1