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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Product Information [Line Items]      
Goodwill $ 114,164 $ 114,123  
Goodwill, impairment loss $ 0 0 $ 0
Tax benefit distributions to noncontrolling interest holders, percent 85.00%    
Tax benefit retained by parent, percent 15.00%    
Commissions receivable $ 20,800 15,900  
Contract liabilities 46,450 47,239  
Insurance, annual exposure limit 20,800 17,900 16,300
Losses and loss adjustment expenses 285,394 298,593 220,658
Self insurance reserve $ 2,100 1,600  
Matching contribution 4.00%    
Defined contribution plan $ 7,300 6,500 6,000
Advertising expense $ 27,200 25,900 25,500
Revenue Benchmark | Customer Concentration Risk | The Hagerty Group, LLC      
Product Information [Line Items]      
Percent of total 90.00%    
Labor And Related Expense Member      
Product Information [Line Items]      
Losses and loss adjustment expenses $ 18,600 $ 13,600 $ 14,200
Short-term Contract with Customer      
Product Information [Line Items]      
Revenue recognized from contract liabilities 2,000    
Speed Digital and Broad Arrow      
Product Information [Line Items]      
Goodwill $ 103,600    
Building and Building Improvements      
Product Information [Line Items]      
Property, plant and equipment, useful life 39 years    
Minimum      
Product Information [Line Items]      
Lessee, operating lease, renewal term 1 year    
Minimum | Computers      
Product Information [Line Items]      
Property, plant and equipment, useful life 3 years    
Maximum      
Product Information [Line Items]      
Lessee, operating lease, renewal term 20 years    
Maximum | Automobiles      
Product Information [Line Items]      
Property, plant and equipment, useful life 7 years    
The Hagerty Group, LLC      
Product Information [Line Items]      
Ownership percentage by Hagerty, Inc 29.10% 26.10%