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Borrowing Arrangements - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Bank
Sep. 30, 2014
Debt
Dec. 31, 2013
Sep. 30, 2014
Letter of Credit and Performance Guarantee [Member]
Sep. 27, 2010
2010 Convertible Senior Subordinated Notes [Member]
Sep. 30, 2014
2010 Convertible Senior Subordinated Notes [Member]
Dec. 31, 2013
2010 Convertible Senior Subordinated Notes [Member]
Sep. 30, 2014
2010 Convertible Senior Subordinated Notes [Member]
Minimum [Member]
Sep. 30, 2014
Privately Negotiated Transaction [Member]
2010 Notes [Member]
Sep. 30, 2014
2006 Convertible Senior Subordinated Notes [Member]
Sep. 30, 2014
Credit Facility With Bank Of America [Member]
Debt Instrument [Line Items]                      
Primary debt arrangements   2                  
Convertible Senior Subordinated Notes         $ 130,000,000 $ 97,700,000          
Unsecured credit facility 400,000,000 400,000,000       400,000,000         275,000,000
Interest rate on Notes         4.875%         3.125%  
Notes payable terms           Semi-annually in arrears on April 1 and October 1       Semi-annually in arrears on each June 1 and December 1  
Maturity date of Notes         Oct. 01, 2015         Jun. 01, 2026  
Beginning date of notes         Jul. 01, 2015            
Percentage of Common stock         135.00%            
Common stock convertible price         $ 7.41            
Notes, convertible, threshold trading days           30 days   20 days      
Notes, convertible, terms of conversion feature           The holders of the 2010 Notes may convert their 2010 Notes beginning July 1, 2015, or earlier, if the market price per share of CBIZ common stock exceeds 135% of the initial conversion price of $7.41 for at least 20 days during the period of 30 consecutive trading days ending on the final trading day of the preceding quarter.          
Shares issued in exchange for partial retirement of debt                 1,500,000    
Partial extinguishment of debt                 32,400,000    
Cash portion of retirement                 30,600,000    
Amortized discount at annual effective rate         7.50%            
Discount, period of issuance         5 years            
Remaining period for amortization of discount           12 months          
Aggregate principal amount of notes           97,650,000 130,000,000     750,000  
Group of participating banks 8                    
Outstanding balance under applicable credit facility 108,000,000 108,000,000 48,500,000                
Approximately available funds under credit facility 172,600,000 172,600,000                  
Outstanding letters of credit and performance guarantees       $ 4,400,000              
Maturity date of credit facility   2019-07