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Acquisitions - Additional Information (Detail) (USD $) | 6 Months Ended
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Jun. 30, 2013 Client_List | Jun. 30, 2012 Client_List Business
Business Acquisition, Contingent Consideration [Line Items] |  |
Consideration paid in cash | $ 3,700,000 | $ 6,800,000
Consideration paid in cash | 400,000 | 1,700,000
CBIZ contingent consideration | 4,600,000 | 2,500,000
Number of client list purchased | 1 | 2
Fair value of contingent consideration | 900,000 | 100,000
Number of business acquired |  | 2
Consideration paid in common stock |  | 800,000
Associated Insurance Agents (Member) |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Consideration paid in cash | 1,000,000 |
Contingent arrangements arising from acquisitions | 5,200,000 |
Fair value of contingent consideration | 4,600,000 |
Goodwill | 7,915,000 |
Number of common stock issued | 136,000 |
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 Acquisition, Contingent Consideration [Line Items] |  |
Consideration paid in cash |  | 15,700,000
Number of common stock issued |  | 263,000
Common stock issued |  | 251,100
Client Lists [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Consideration paid in cash | 300,000 | 400,000
CBIZ contingent consideration | $ 200,000 | $ 2,500,000

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