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Stockholders' Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Sep. 30, 2025
shares
Dec. 31, 2025
USD ($)
vote
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
Jul. 31, 2024
shares
Class of Stock [Line Items]              
Preferred stock, shares authorized (in shares)       20,000,000      
General and administrative expenses | $       $ 94,517 $ 82,504 $ 85,434  
Non-controlling interest | $       17,000 3,200    
Distributions paid to non-controlling interest unit holders | $       30,256 6,683    
THG LLC              
Class of Stock [Line Items]              
Dividends, preferred stock, cash | $ $ 5,600 $ 5,600          
Distributions paid to non-controlling interest unit holders | $       30,300 6,700    
THG LLC | Hagerty, Inc.              
Class of Stock [Line Items]              
Distributions paid to non-controlling interest unit holders | $       11,900 $ 1,100    
THG Unit Exchange              
Class of Stock [Line Items]              
General and administrative expenses | $       $ 1,500      
Class A Common Stock              
Class of Stock [Line Items]              
Common stock, shares authorized (in shares)       500,000,000 500,000,000    
Common stock, par value (in dollars per share) | $ / shares       $ 0.0001 $ 0.0001    
Common stock, votes per share | vote       1      
Units owned (in shares)       100,706,893 90,032,391    
Common stock, shares, issued (in shares)       100,706,893 90,032,391   3,876,201
Stock issued during period, shares, new issues     9,481,750        
Class A Common Stock | 2021 Stock Incentive Plan              
Class of Stock [Line Items]              
Stock issued during period, shares, new issues       860,238 1,216,339    
Class A Common Stock | 2021 Employee Stock Purchase Plan              
Class of Stock [Line Items]              
Stock issued during period, shares, new issues       56,712 30,497    
Class V Common Stock              
Class of Stock [Line Items]              
Common stock, shares authorized (in shares)       300,000,000 300,000,000    
Common stock, par value (in dollars per share) | $ / shares       $ 0.0001 $ 0.0001    
Common stock, votes per share | vote       10      
Units owned (in shares)       241,552,156 251,033,906    
Common stock, shares, issued (in shares)       241,552,156 251,033,906    
Common stock, conversion ratio       1      
Stock issued during period, shares, new issues     9,481,750 275,802 320,818    
Convertible Preferred Stock              
Class of Stock [Line Items]              
Preferred stock, par value (in dollars per share) | $ / shares       $ 0.0001      
Series A Convertible Preferred Stock              
Class of Stock [Line Items]              
Preferred stock, shares issued (in shares)       8,483,561 8,483,561    
Preferred stock, shares outstanding (in shares)       8,483,561 8,483,561    
Dividends, preferred stock, cash | $ $ 5,600 $ 5,600