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Acquisitions - Additional Information (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Business Acquisition, Contingent Consideration [Line Items] |  |
Consideration paid in cash | $ 1,500,000 | $ 900,000
CBIZ contingent consideration | 10,200,000 |
Consideration paid in common stock | 1,900,000 |
Goodwill | 20,610,000 |
Fair value of contingent consideration | 1,000,000 | 900,000
Number of common stock issued |  | 99,000
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 | 3 |
Consideration paid in cash | 16,500,000 |
Contingent arrangements arising from acquisitions | 10,900,000 |
Fair value of contingent consideration | 10,200,000 |
Goodwill | $ 20,600,000 |

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