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Acquisitions - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Consideration paid in cash | $ 0 | $ 1,500,000 | $ 1,000,000 |
Goodwill | 410,539,000 | 410,539,000 |  | 384,697,000
Fair value of contingent consideration | 2,100,000 | 3,000,000 | 900,000 |
Number of common stock issued |  |  | 136,000 |
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 |  | 4 |  |
Consideration paid in cash |  | 24,600,000 |  |
CBIZ contingent consideration | 12,000,000 | 12,000,000 |  |
Consideration paid in common stock |  | 2,900,000 |  |
Contingent arrangements arising from acquisitions | 13,500,000 | 13,500,000 |  |
Contingent consideration | 12,000,000 | 12,000,000 |  |
Goodwill | 26,325,000 | 26,325,000 |  |
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 |

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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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