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Business Combinations - Additional Information (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Acquisition
Dec. 31, 2018
USD ($)
Acquisition
Dec. 31, 2017
USD ($)
Acquisition
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]        
Number of acquisitions | Acquisition 23 23    
Aggregate purchase price of acquisitions $ (4,100,000) $ 21,400 $ 1,500,000  
Payments to Acquire Businesses, Gross 356,260,000 934,928,000 41,471,000  
Goodwill, Acquired During Period 328,546,000 717,710,000 42,200,000  
Goodwill currently deductible for income tax purposes 245,600,000 640,300,000 35,300,000  
Goodwill related to the recorded earn-out payables 82,900,000 77,400,000 6,900,000  
Total revenues related to acquisitions 49,100,000 82,400,000 7,800,000  
Income before income taxes related to acquisitions 3,400,000 6,300,000 2,400,000  
Maximum Future Contingency payments Acquisitions 328,700,000      
Estimated acquisition earn-out payables 161,513,000 89,924,000 36,175,000 $ 63,821,000
Other Noncurrent Liabilities        
Business Acquisition [Line Items]        
Estimated acquisition earn-out payables 143,600,000 68,800,000 11,100,000  
Accounts payable        
Business Acquisition [Line Items]        
Estimated acquisition earn-out payables 17,900,000 21,100,000 25,100,000  
Retail        
Business Acquisition [Line Items]        
Goodwill, Acquired During Period 302,640,000 676,902,000 33,100,000  
National Programs        
Business Acquisition [Line Items]        
Goodwill, Acquired During Period 74,000 18,737,000 7,200,000  
Wholesale Brokerage        
Business Acquisition [Line Items]        
Goodwill, Acquired During Period 6,479,000 5,524,000 1,200,000  
Services        
Business Acquisition [Line Items]        
Goodwill, Acquired During Period 19,353,000 16,547,000    
Goodwill adjusted amount $ 19,300,000 $ 16,500,000 $ 700,000  
Purchased Customer Accounts        
Business Acquisition [Line Items]        
Weighted average life (years) 15 years 15 years 15 years  
Non-compete Agreements        
Business Acquisition [Line Items]        
Weighted average life (years) 5 years 5 years 5 years  
Business Combinations - Asset Deals        
Business Acquisition [Line Items]        
Number of acquisitions | Acquisition 22 20 11  
Business Combinations - Stock Deals        
Business Acquisition [Line Items]        
Number of acquisitions | Acquisition 1 3    
Book of Business Purchases        
Business Acquisition [Line Items]        
Number of acquisitions | Acquisition 4 1 1