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Stockholders' Equity - Schedule of Other Ownership Interests (Details) - shares
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Jul. 31, 2024
THG units held by Hagerty, Inc.      
Class of Stock [Roll Forward]      
Beginning balance (in shares) 345,210,737    
Ending balance (in shares) 346,127,687 345,210,737  
Beginning of period 26.10% 24.90%  
End of period 29.10% 26.10%  
Common stock, shares, issued (in shares) 346,127,687 345,210,737  
THG units held by other unit holders      
Class of Stock [Roll Forward]      
Beginning balance (in shares) 255,178,346 255,499,164  
Ending balance (in shares) 245,420,794 255,178,346  
Beginning of period 73.90% 75.10%  
End of period 70.90% 73.90%  
Class A Common Stock      
Class of Stock [Roll Forward]      
Beginning balance (in shares) 90,032,391    
Ending balance (in shares) 100,706,893 90,032,391  
Common stock, shares, issued (in shares) 100,706,893 90,032,391 3,876,201
Class A Common Stock | THG units held by Hagerty, Inc.      
Class of Stock [Roll Forward]      
Beginning balance (in shares) 90,032,391 84,588,536  
Issuance of shares under employee plans (in shares) 916,950 1,246,836  
Exchange of THG units for Class A Common Stock (in shares) (9,757,552) (320,818)  
Warrant exchange (in Shares) 0 3,876,201  
Ending balance (in shares) 100,706,893 90,032,391  
Class A Common Stock | THG units held by other unit holders      
Class of Stock [Roll Forward]      
Exchange of THG units for Class A Common Stock (in shares) (9,757,552) (320,818)