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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