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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 |  |  |  |  |  |

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