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Related-Party Transactions - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2023
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Related Party Transaction [Line Items]          
Restricted cash and cash equivalents   $ 138,823 $ 128,061 $ 615,950  
Contract liabilities   46,450 47,239    
State Farm Term Loan | 2025 JPM Credit Facility          
Related Party Transaction [Line Items]          
Fixed rate (as a percent)         8.00%
State Farm Term Loan | 2025 JPM Credit Facility | Hagerty Reinsurance Ltd          
Related Party Transaction [Line Items]          
Debt face amount   $ 24,500     $ 25,000
Reinsurance Agreement | Affiliated Entity          
Related Party Transaction [Line Items]          
Reinsured risk, percentage 100.00% 80.00%      
Reinsured risk, ceded, percentage   50.00%      
Reinsurance Agreement | Affiliated Entity | Evanston          
Related Party Transaction [Line Items]          
Restricted cash and cash equivalents   $ 680,400 $ 589,200    
Alliance Agreement | Affiliated Entity | State Farm          
Related Party Transaction [Line Items]          
Related party transaction, transaction term (in year)   10 years      
Contract liabilities   $ 20,000