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Discontinued Operations and Divestitures - Additional Information (Detail) (USD $)	3 Months Ended			6 Months Ended			1 Months Ended
	Jun. 23, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Medical Management Professionals Business [Member]	Jul. 26, 2013 Medical Management Professionals Business [Member] Subsequent Event [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of capital stock							$ 200,000,000
Proceeds from capital stock							145,000,000
Amount related to credit facility debt						40,000,000
CBIZ recorded a tax benefit	1,900,000	1,115,000	1,314,000	1,972,000	2,311,000
Gain from the sale of its individual wealth management business					2,500,000
Cash proceed from sale of business and client list					$ 900,000

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Disposal group business transferred amount under contractual arrangement.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

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Amount borrowed under the credit facility as of the balance sheet date.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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