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Significant Accounting Policies - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Entity Information [Line Items]      
Allowance for estimated policy cancellations $ 22,300,000 $ 18,700,000  
Producer commissions chargeback 10,500,000 10,300,000  
Gross Carrying Value 1,445,384,000 1,302,369,000  
Capitalized costs, cloud computing arrangements 7,500,000    
Debt financing costs included in other assets, gross 9,500,000 9,500,000  
Deferred financing costs included in other assets, accumulated amortization 5,700,000 4,600,000  
Deferred financing costs included in long-term debt, gross 45,300,000 45,100,000  
Deferred financing costs included in long-term debt, accumulated amortization 20,300,000 15,800,000  
Amortization of deferred financing costs 5,690,000 5,841,000 $ 5,129,000
Investments in equity securities 5,900,000 6,100,000  
IBNR Reserve $ 3,300,000 3,200,000  
Income tax benefit, percentage of benefit payable to noncontrolling owners 85.00%    
Cash deposits, FDIC insured amount per account $ 250,000    
Emerald Bay      
Entity Information [Line Items]      
Interest in Baldwin Holdings held by Baldwin 2.50%    
Emerald Bay | Related Party      
Entity Information [Line Items]      
Investments in Emerald Bay $ 2,300,000 $ 2,100,000  
Builder Risk Management      
Entity Information [Line Items]      
Investments in Emerald Bay $ 11,700,000    
Customer One | Revenue Benchmark | Customer Concentration Risk [Member]      
Entity Information [Line Items]      
Concentration 10.00% 10.00%  
Minimum | Emerald Bay      
Entity Information [Line Items]      
Equity Method Investment, Ownership Percentage Influence Threshold, Less Than 3.00%    
Maximum | Emerald Bay      
Entity Information [Line Items]      
Equity Method Investment, Ownership Percentage Influence Threshold, Less Than 5.00%    
Capitalized software | Minimum      
Entity Information [Line Items]      
Useful Life 2 years    
Capitalized software | Maximum      
Entity Information [Line Items]      
Useful Life 5 years    
Acquired Relationships [Member]      
Entity Information [Line Items]      
Gross Carrying Value $ 1,253,396,000 $ 1,136,326,000  
Acquired Relationships [Member] | Minimum      
Entity Information [Line Items]      
Useful Life 10 years    
Acquired Relationships [Member] | Maximum      
Entity Information [Line Items]      
Useful Life 20 years    
Trade Names      
Entity Information [Line Items]      
Gross Carrying Value $ 28,474,000 27,924,000  
Trade Names | Minimum      
Entity Information [Line Items]      
Useful Life 1 year    
Trade Names | Maximum      
Entity Information [Line Items]      
Useful Life 5 years    
Software      
Entity Information [Line Items]      
Gross Carrying Value $ 163,514,000 138,119,000  
Software | Minimum      
Entity Information [Line Items]      
Useful Life 2 years    
Software | Maximum      
Entity Information [Line Items]      
Useful Life 5 years    
Capitalized software      
Entity Information [Line Items]      
Gross Carrying Value $ 92,300,000 $ 66,900,000