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Common Stock - Additional Information (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 30, 2013
USD ($)
$ / shares
Jul. 01, 2013
Jun. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Oct. 01, 2015
USD ($)
Schedule Of Common Stock [Line Items]                
Common stock, shares authorized | shares         250,000,000 250,000,000    
Common stock, par value | $ / shares         $ 0.01 $ 0.01    
Common stock voting rights         One vote for each share held on all matters submitted to a vote of stockholders. There are no cumulative voting rights with respect to the election of directors.      
Common stock, shares issued | shares         126,182,000 118,820,000    
Senior leverage ratio         3.0      
Share repurchase program, description         Under CBIZ's credit facility (described in Note 8) share repurchases are unlimited when total leverage is less than 3.0. When leverage is greater than 3.0, the annual share repurchase is limited to $25.0 million.      
Stock repurchase program authorized to be repurchased | shares         3,800,000 3,200,000 0  
Payment for acquisition of treasury stock | $         $ 35,200,000 $ 26,600,000    
Payment for acquisition of treasury stock | $         $ 36,482,000 28,137,000 $ 26,468,000  
2010 Convertible Senior Subordinated Notes [Member]                
Schedule Of Common Stock [Line Items]                
Maturity date of notes         Oct. 01, 2015      
Principal amount of notes | $         $ 48,400,000 $ 97,650,000   $ 48,400,000
Common stock, shares issued | shares         0      
Shares issued in exchange for partial retirement of debt | shares     5,100,000 1,500,000 5,100,000 1,500,000    
Partial extinguishment of debt | $     $ 49,300,000 $ 32,400,000 $ 49,300,000 $ 32,400,000    
Maximum [Member]                
Schedule Of Common Stock [Line Items]                
Annual share repurchase limit | $         $ 25,000,000      
Westbury Agreement [Member]                
Schedule Of Common Stock [Line Items]                
Common stock, par value | $ / shares         $ 7.25      
Stock repurchase program authorized to be repurchased | shares         7,700,000      
MMP [Member]                
Schedule Of Common Stock [Line Items]                
Percentage of Holding 50.00%              
Common stock, per share amount | $ / shares $ 6.65              
Payment for acquisition of treasury stock | $ $ 25,700,000              
MMP [Member] | Westbury Agreement [Member]                
Schedule Of Common Stock [Line Items]                
Stock repurchase program authorized to be repurchased | shares             3,900,000  
Percentage of Holding 50.00%           50.00%  
Common stock, per share amount | $ / shares $ 6.65           $ 6.65  
Payment for acquisition of treasury stock | $ $ 25,700,000           $ 25,700,000  
Number of days moving average share price calculation 60 days 60 days