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Related-Party Transactions - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2026
USD ($)
state
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2020
USD ($)
Related Party Transaction [Line Items]          
Restricted cash and cash equivalents $ 154,362 $ 138,823 $ 158,604    
Contract liabilities 46,383 46,450      
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       $ 25,000  
Reinsurance Agreement | Affiliated Entity | Essentia          
Related Party Transaction [Line Items]          
Restricted cash and cash equivalents $ 592,200 $ 680,400      
Alliance Agreement | Affiliated Entity | State Farm          
Related Party Transaction [Line Items]          
Related party transaction, transaction term (in year) 10 years        
Number of states | state 33        
Contract liabilities         $ 20,000