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Acquisitions - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Client_List
Dec. 31, 2012
Dec. 31, 2011
Client_List
Dec. 31, 2013
Associated Insurance Agents (AIA), Minnesota and Knight Field Fabry LLP (Knight) [Member]
Business
Dec. 31, 2013
Associated Insurance Agents (AIA), Minnesota and Knight Field Fabry LLP (Knight) [Member]
Current Contingent Purchase Price Liability [Member]
Dec. 31, 2013
Associated Insurance Agents (AIA), Minnesota and Knight Field Fabry LLP (Knight) [Member]
Non-Current Contingent Purchase Price Liability [Member]
Dec. 31, 2011
Thompson Dunavant PLC, Multiple Benefit Services, Inc. (MBS), Gresham Smith LLC and Atlantic MDR, LLC (d/b/a Advantage Benefit Planning) (ABP) [Member]
Business
Dec. 31, 2011
Thompson Dunavant PLC, Multiple Benefit Services, Inc. (MBS), Gresham Smith LLC and Atlantic MDR, LLC (d/b/a Advantage Benefit Planning) (ABP) [Member]
Minimum [Member]
Dec. 31, 2011
Thompson Dunavant PLC, Multiple Benefit Services, Inc. (MBS), Gresham Smith LLC and Atlantic MDR, LLC (d/b/a Advantage Benefit Planning) (ABP) [Member]
Maximum [Member]
Dec. 31, 2011
Thompson Dunavant PLC, Multiple Benefit Services, Inc. (MBS), Gresham Smith LLC and Atlantic MDR, LLC (d/b/a Advantage Benefit Planning) (ABP) [Member]
Other Current Liabilities [Member]
Dec. 31, 2011
Thompson Dunavant PLC, Multiple Benefit Services, Inc. (MBS), Gresham Smith LLC and Atlantic MDR, LLC (d/b/a Advantage Benefit Planning) (ABP) [Member]
Other Non-current Liabilities [Member]
Dec. 31, 2012
Meridian Insurance Group, LLC (Meridian), Primarily Care, Inc. (PCI) Stoltz and Company, LTD., L.L.P (Stoltz), Trinity Risk Advisors, Inc.(Trinity), Strategic Employee Benefit Services-The Pruett Group, Inc. (SEBS-Pruett), ProMedical, Inc. (ProMedical), the employee benefit division of Leavitt Pacific Insurance Brokers, Inc. (Leavitt), Diversified Industries, Inc. d/b/a Payroll Control Systems (PCS) and PHBV Partners, L.L.P. (PHBV) [Member]
Business
Dec. 31, 2012
Meridian Insurance Group, LLC (Meridian), Primarily Care, Inc. (PCI) Stoltz and Company, LTD., L.L.P (Stoltz), Trinity Risk Advisors, Inc.(Trinity), Strategic Employee Benefit Services-The Pruett Group, Inc. (SEBS-Pruett), ProMedical, Inc. (ProMedical), the employee benefit division of Leavitt Pacific Insurance Brokers, Inc. (Leavitt), Diversified Industries, Inc. d/b/a Payroll Control Systems (PCS) and PHBV Partners, L.L.P. (PHBV) [Member]
Other Current Liabilities [Member]
Dec. 31, 2012
Meridian Insurance Group, LLC (Meridian), Primarily Care, Inc. (PCI) Stoltz and Company, LTD., L.L.P (Stoltz), Trinity Risk Advisors, Inc.(Trinity), Strategic Employee Benefit Services-The Pruett Group, Inc. (SEBS-Pruett), ProMedical, Inc. (ProMedical), the employee benefit division of Leavitt Pacific Insurance Brokers, Inc. (Leavitt), Diversified Industries, Inc. d/b/a Payroll Control Systems (PCS) and PHBV Partners, L.L.P. (PHBV) [Member]
Other Non-current Liabilities [Member]
Feb. 01, 2012
Client lists [Member]
Dec. 31, 2013
Client lists [Member]
Dec. 31, 2011
Client lists [Member]
Dec. 31, 2013
Employee Services [Member]
Client_List
Dec. 31, 2013
Financial Services Practice Group [Member]
Client_List
Business Acquisition, Contingent Consideration [Line Items]                                      
Number of businesses acquired       2     4         8              
Aggregate consideration paid       $ 10,800,000                              
Consideration paid in cash 10,100,000 25,600,000 16,700,000 4,900,000     11,800,000         74,200,000     2,500,000 300,000 800,000    
Guaranteed future consideration       400,000     1,100,000         1,700,000              
CBIZ contingent consideration       5,500,000     13,400,000         15,400,000       300,000 600,000    
Contingent arrangements arising from acquisitions       6,100,000               18,500,000              
Contingent liability 2,200,000     5,500,000 1,200,000 4,300,000 13,400,000     4,100,000 9,300,000 15,400,000 4,600,000 10,800,000          
Goodwill 384,697,000 375,122,000 317,434,000 9,278,000     16,869,000         57,190,000              
Goodwill deductible for tax purposes       1,400,000     11,800,000         53,000,000              
Number of client list purchased 3   1                             2 1
Number of common stock issued 184,000 402,000 38,900                                
Fair value of contingent consideration 1,100,000 1,100,000 3,500,000                                
Business acquisition, revenue recorded                       25,400,000              
Consideration paid in common stock             3,300,000         3,600,000              
Short-term notes payable                       4,500,000              
Common stock issuable   41,314 251,100                                
Aggregate Consideration of Acquisitions             29,600,000                        
Contingent arrangements arising from acquisitions               0 15,100,000                    
Goodwill purchase price adjustments   1,400,000                                  
Reduction in the value of goodwill   700,000                                  
Interest expense   2,000,000                                  
Amortization expense   $ 2,600,000