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Acquisitions (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2012 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]	Feb. 01, 2012 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]
Acquisitions (Textual) [Abstract]
Amount Paid by Company	$ 0.9		$ 15.6
Number of common stock issued	99,000		263,000
Consideration paid in cash				5.1
Consideration paid in common stock				0.6
Guaranteed future consideration				1.7
CBIZ contingent consideration				3.6
Acquisitions (Additional Textual) [Abstract]
Fair value of contingent consideration	$ 0.9	$ 0.3

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Business acquisition cost of acquired entity contingent consideration.

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Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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