v3.26.1
Stockholders' Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
vote
$ / shares
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2026
USD ($)
vote
$ / shares
shares
Sep. 30, 2025
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2026
USD ($)
vote
$ / shares
shares
Jun. 30, 2025
USD ($)
shares
Dec. 31, 2025
$ / shares
shares
Class of Stock [Line Items]                
Units owned (in shares) 346,801,330 345,815,692 346,801,330   345,815,692 346,801,330 345,815,692  
Common stock, shares, issued (in shares) 346,801,330 345,815,692 346,801,330   345,815,692 346,801,330 345,815,692  
Preferred stock, shares authorized (in shares) 20,000,000   20,000,000     20,000,000    
Non-controlling interest | $ $ 800 $ 700 $ 800   $ 700 $ 800 $ 700  
Non-controlling interest unit holders | $     $ 478   $ 5,704 837 30,380  
THG LLC                
Class of Stock [Line Items]                
Dividends, preferred stock, cash | $ $ 5,600 5,600            
Non-controlling interest unit holders | $           800 30,400  
THG LLC | Hagerty, Inc.                
Class of Stock [Line Items]                
Non-controlling interest unit holders | $           $ 700 $ 11,800  
Class A Common Stock                
Class of Stock [Line Items]                
Common stock, shares authorized (in shares) 500,000,000   500,000,000     500,000,000   500,000,000
Common stock, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001     $ 0.0001   $ 0.0001
Common stock, votes per share | vote 1   1     1    
Units owned (in shares) 101,804,938   101,804,938     101,804,938   100,706,893
Common stock, shares, issued (in shares) 101,804,938   101,804,938     101,804,938   100,706,893
Stock issued during period, shares, new issues (in shares)       9,481,750   30,526 33,550  
Class A Common Stock | 2021 Stock Incentive Plan                
Class of Stock [Line Items]                
Stock issued during period, shares, new issues (in shares)           643,117 571,405  
Class V Common Stock                
Class of Stock [Line Items]                
Common stock, shares authorized (in shares) 300,000,000   300,000,000     300,000,000   300,000,000
Common stock, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001     $ 0.0001   $ 0.0001
Common stock, votes per share | vote 10   10     10    
Units owned (in shares) 241,552,156   241,552,156     241,552,156   241,552,156
Common stock, shares, issued (in shares) 241,552,156   241,552,156     241,552,156   241,552,156
Common stock, conversion ratio           1    
Stock issued during period, shares, new issues (in shares)       9,481,750   424,402 78,302  
Convertible Preferred Stock                
Class of Stock [Line Items]                
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001     $ 0.0001    
Series A Convertible Preferred Stock                
Class of Stock [Line Items]                
Preferred stock, shares issued (in shares) 8,483,561   8,483,561     8,483,561   8,483,561
Preferred stock, shares outstanding (in shares) 8,483,561   8,483,561     8,483,561   8,483,561
Dividends, preferred stock, cash | $ $ 5,600 $ 5,600