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Acquisitions (First quarter 2014) - Additional Information (Detail) $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Feb. 01, 2014 | Jan. 01, 2014 Employees | Sep. 30, 2014 USD ($) Business | Jun. 30, 2014 USD ($) Business | Mar. 31, 2014 USD ($) Business | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Consideration paid in common stock |  |  |  |  |  | $ 2.0 | $ 0.2
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] |  |  |  |  |  |  |
Consideration paid in cash |  |  | $ 3.1 | $ 8.1 | $ 16.5 |  |
Consideration paid in common stock |  |  |  | 0.9 | 1.9 |  |
Contingent consideration |  |  | $ 1.9 | $ 2.1 | $ 10.2 |  | $ 1.9
Number of businesses acquired | Business |  |  | 1 | 1 | 3 |  |
Centric Insurance Agency [Member] |  |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Acquired entity, name |  | Centric Insurance Agency |  |  |  |  |
Effective date of acquisition |  |  |  |  |  | Jan. 01, 2014 |
Lewis Birch & Richardo, LLC [Member] |  |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Acquired entity, name | Lewis Birch & Richardo, LLC |  |  |  |  |  |
Effective date of acquisition |  |  |  |  |  | Feb. 01, 2014 |
Clearview National Partners, L.L.C [Member] |  |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Acquired entity, name |  | Clearview National Partners, LLC |  |  |  |  |
Effective date of acquisition |  |  |  |  |  | Jan. 01, 2014 |
Clearview National Partners, L.L.C [Member] | Minimum [Member] |  |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Number of employees covered | Employees |  | 100 |  |  |  |  |

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