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Acquisitions (Third quarter 2014) - Additional Information (Detail) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2014 USD ($) Business | Jun. 30, 2014 USD ($) Business | Mar. 31, 2014 USD ($) Business | Sep. 30, 2015 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Contingent consideration |  |  |  | $ 4.2
Clearview National Partners, L.L.C, Centric Insurance Agency and Lewis Birch & Richardo, LLC [Member] |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Number of businesses acquired | Business | 1 | 1 | 3 |
Consideration paid in cash | $ 3.1 | $ 8.1 | $ 16.5 |
Contingent consideration | $ 1.9 | $ 2.1 | $ 10.2 |

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