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Acquisitions - Additional Information (Detail) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | $ 416,139,000 |  | $ 384,697,000
Consideration paid in cash | 2,300,000 | 4,100,000 |
Common stock, shares issued | 100,000 |  |
Fair value of contingent consideration | 3,600,000 | 1,100,000 |
Number of common stock issued |  | 200,000 |
Associated Insurance Agents [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash |  | 3,700,000 |
Contingent consideration |  | 4,600,000 |
Guaranteed future consideration |  | 400,000 |
Acquisition of Client Lists [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash |  | 300,000 |
Contingent consideration |  | 200,000 |
Number of client list purchased |  | 1 |
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview) and Lewis Birch & Richardo, LLC (LBR) [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of businesses acquired | 5 |  |
Consideration paid in cash | 27,600,000 |  |
CBIZ contingent consideration | 14,000,000 |  |
Consideration paid in common stock | 2,800,000 |  |
Contingent arrangements arising from acquisitions | 15,400,000 |  |
Contingent consideration | 14,000,000 |  |
Goodwill | $ 31,925,000 |  |

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