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Summary of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
Segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Jan. 01, 2018
USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Number of reportable segments | Segment 4        
Cumulative Effect of New Accounting Principle in Period of Adoption     $ 117,515,000    
Deferred Costs $ 26,900,000 $ 13,200,000      
Average Annual EBITDA, Operating Profit Earned Period Maximum 3 years        
Accumulated impairment losses $ 0        
Goodwill impairment loss 0 0 $ 0    
Stock split ratio     2    
Long-term Debt, Fair Value 848,700,000 848,700,000      
Revolving and term loan 715,000,000.0        
Amounts due from reinsurance carriers $ 0        
Minimum          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Property, Plant and Equipment, Useful Life 3 years        
Finite-Lived Intangible Asset, Useful Life 3 years        
Maximum          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Property, Plant and Equipment, Useful Life 15 years        
Finite-Lived Intangible Asset, Useful Life 15 years        
Cost to Obtain          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Deferred Costs $ 15,100,000 13,700,000      
Capitalized Contract Cost, Amortization 1,400,000 500,000      
Cost to Fulfill          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Deferred Costs 73,300,000 69,800,000     $ 52,700,000
Capitalized Contract Cost, Amortization 1,000,000.0 1,300,000      
Incentive Commissions Revenue          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Effect on revenue 81,260,000 51,146,000      
Profit-Sharing Contingent Commission Revenue          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Effect on revenue 59,166,000 55,875,000      
Fee Revenue          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Effect on revenue 646,766,000 530,838,000      
Fee Revenue | Services          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Effect on revenue $ 193,641,000 189,041,000      
Retained Earnings          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption     $ 117,515,000   $ 117,500,000
Accounting Standards Update 2016-02          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption       $ 202,900,000  
Accounting Standards Update 2014-09 | Premiums Payable          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption     12,107,000    
Accounting Standards Update 2014-09 | Accounts Payable          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption     8,747,000    
Accounting Standards Update 2014-09 | Accrued Liabilities          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption     22,794,000    
Accounting Standards Update 2014-09 | Other Current Assets          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption     52,680,000    
Accounting Standards Update 2014-09 | Incentive Commissions Revenue | Difference between Revenue Guidance in Effect before and after Topic 606          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Effect on revenue   9,900,000      
Accounting Standards Update 2014-09 | Profit-Sharing Contingent Commission Revenue | Difference between Revenue Guidance in Effect before and after Topic 606          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Effect on revenue   2,300,000      
Accounting Standards Update 2014-09 | Fee Revenue | Difference between Revenue Guidance in Effect before and after Topic 606          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Effect on revenue   6,200,000      
Accounting Standards Update 2014-09 | Fee Revenue | Difference between Revenue Guidance in Effect before and after Topic 606 | Services          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Effect on revenue   10,500,000      
Accounting Standards Update 2014-09 | Fee Revenue | Difference between Revenue Guidance in Effect before and after Topic 606 | Corporate, Non-Segment          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Effect on revenue   $ (4,300,000)      
Accounting Standards Update 2014-09 | Retained Earnings          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption     $ 117,515,000