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Revenue Recognition (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue from External Customer [Line Items]                      
Contract with Customer, Liability, Current $ 37,000,000.0       $ 44,500,000       $ 37,000,000.0 $ 44,500,000  
Contract with Customer, Liability, Noncurrent 16,500,000       6,700,000       16,500,000 6,700,000  
Contract with Customer, Asset, Net 265,994,000       210,323,000       265,994,000 210,323,000  
Insurance Commissions                 1,362,037,000    
Fees and Commissions, Other                 530,838,000    
Incentive Commission                 51,146,000    
Contingent commissions                 55,875,000    
Guaranteed Supplemental Commissions                 9,961,000    
Investment income                 2,746,000 1,626,000 $ 1,456,000
Other income, net                 1,643,000 22,451,000 2,386,000
Revenues 508,748,000 $ 530,850,000 $ 473,187,000 $ 501,461,000 474,316,000 $ 475,646,000 $ 466,305,000 $ 465,080,000 2,014,246,000 1,881,347,000 1,766,629,000
Contract with Customer, Liability 53,496,000       $ 51,236,000       53,496,000 51,236,000  
Deferred Revenue, Revenue Recognized                 8,900,000    
Operating Segments [Member] | Retail [Member]                      
Revenue from External Customer [Line Items]                      
Insurance Commissions                 811,820,000    
Fees and Commissions, Other                 148,121,000    
Incentive Commission                 48,698,000    
Contingent commissions                 24,517,000    
Guaranteed Supplemental Commissions                 8,535,000    
Investment income                 2,000 8,000 37,000
Other income, net                 1,070,000    
Revenues                 1,042,763,000 943,460,000 917,406,000
Operating Segments [Member] | Various [Member]                      
Revenue from External Customer [Line Items]                      
Insurance Commissions                 (68,000)    
Fees and Commissions, Other                 (1,090,000)    
Incentive Commission                 41,000    
Contingent commissions                 0    
Guaranteed Supplemental Commissions                 0    
Investment income                 1,868,000    
Other income, net                 9,000    
Revenues                 760,000    
Operating Segments [Member] | Services                      
Revenue from External Customer [Line Items]                      
Insurance Commissions                 0    
Fees and Commissions, Other                 189,041,000    
Incentive Commission                 0    
Contingent commissions                 0    
Guaranteed Supplemental Commissions                 0    
Investment income                 205,000 299,000 283,000
Other income, net                 0    
Revenues                 189,246,000 165,372,000 156,365,000
Operating Segments [Member] | Wholesale Brokerage [Member]                      
Revenue from External Customer [Line Items]                      
Insurance Commissions                 226,117,000    
Fees and Commissions, Other                 50,571,000    
Incentive Commission                 864,000    
Contingent commissions                 7,462,000    
Guaranteed Supplemental Commissions                 1,350,000    
Investment income                 165,000 0 4,000
Other income, net                 485,000    
Revenues                 287,014,000 271,737,000 243,103,000
Operating Segments [Member] | National Programs                      
Revenue from External Customer [Line Items]                      
Insurance Commissions                 324,168,000    
Fees and Commissions, Other                 144,195,000    
Incentive Commission                 1,543,000    
Contingent commissions                 23,896,000    
Guaranteed Supplemental Commissions                 76,000    
Investment income                 506,000 384,000 628,000
Other income, net                 79,000    
Revenues                 494,463,000 $ 479,813,000 $ 448,516,000
Two Thousand Eighteen Acquisition [Member]                      
Revenue from External Customer [Line Items]                      
Contract with Customer, Asset, Net 34,300,000               34,300,000    
Contract with Customer, Liability $ 3,300,000               $ 3,300,000