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Fair Value of Assets and Liabilities - Additional Information (Details)
1 Months Ended 12 Months Ended
Feb. 29, 2020
USD ($)
Oct. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
Interest Rate Swap Agreement          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Notional amount $ 30,000,000.0 $ 140,000,000.0   $ 65,000,000.0  
Term of agreement 60 months 57 months      
Variable-rate term loan   $ 140,000,000.0 $ 205,000,000.0    
Tax Receivable Agreement          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
TRA, balance increased through accretion expense and valuation adjustment     $ 12,400,000    
TRA, measurement input     0.0134   0.0300
Alternative Investment, Valuation Technique [Extensible List]     us-gaap:ValuationTechniqueDiscountedCashFlowMember    
Alternative Investment, Measurement Input [Extensible List]     us-gaap:MeasurementInputDiscountRateMember    
Minimum [Member]          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Contingent consideration liability, measurement input     6.6    
Business Combination, Contingent Consideration, Liability, Valuation Technique [Extensible List]     us-gaap:ValuationTechniqueDiscountedCashFlowMember    
Business Combination, Contingent Consideration, Liability, Measurement Input [Extensible List]     us-gaap:MeasurementInputDiscountRateMember    
Maximum          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Contingent consideration liability, measurement input     7.0    
Business Combination, Contingent Consideration, Liability, Valuation Technique [Extensible List]     us-gaap:ValuationTechniqueDiscountedCashFlowMember    
Business Combination, Contingent Consideration, Liability, Measurement Input [Extensible List]     us-gaap:MeasurementInputDiscountRateMember    
Weighted Average          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Contingent consideration liability, measurement input     6.8    
Business Combination, Contingent Consideration, Liability, Valuation Technique [Extensible List]     us-gaap:ValuationTechniqueDiscountedCashFlowMember    
Business Combination, Contingent Consideration, Liability, Measurement Input [Extensible List]     us-gaap:MeasurementInputDiscountRateMember