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Stockholders' Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
vote
$ / shares
shares
Sep. 30, 2023
USD ($)
shares
Jul. 23, 2024
shares
Jul. 05, 2024
shares
Jul. 04, 2024
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
shares
Class of Stock [Line Items]                  
Common stock, shares, outstanding (in shares)     345,158,709 339,978,229          
Preferred stock, shares authorized (in shares)     20,000,000            
Non-controlling interest | $     $ 3,200 $ 2,300          
Additional paid-in capital | $     601,867         $ 561,754  
Distributions paid to non-controlling interest unit holders | $     5,320            
THG LLC                  
Class of Stock [Line Items]                  
Dividends, preferred stock, cash | $ $ 5,600                
Distributions paid to non-controlling interest unit holders | $     5,300            
Hagerty, Inc. | THG LLC                  
Class of Stock [Line Items]                  
Distributions paid to non-controlling interest unit holders | $     $ 1,100            
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            
Common stock, shares, issued (in shares)     89,980,363   3,876,201 3,686,056 189,438 84,588,536  
Common stock, shares, outstanding (in shares) 85,703,286 84,405,625 89,980,363 84,479,065       84,588,536 83,202,969
Stock issued during period, shares, new issues     320,818 259,302          
Additional paid-in capital | $     $ 3,200 $ 2,300          
Class A Common Stock | 2021 Stock Incentive Plan                  
Class of Stock [Line Items]                  
Stock issued during period, shares, new issues     1,194,808 1,016,794          
Class A Common Stock | 2021 Employee Stock Purchase Plan                  
Class of Stock [Line Items]                  
Stock issued during period, shares, new issues       118,009          
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            
Common stock, shares, issued (in shares)     251,033,906         251,033,906  
Common stock, shares, outstanding (in shares)     251,033,906         251,033,906  
Common stock, conversion ratio     1            
Convertible Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.0001 $ 0.0001            
Series A Convertible Preferred Stock                  
Class of Stock [Line Items]                  
Number of shares issued in transaction (in shares)   8,483,561              
Sale of stock, consideration received per transaction | $   $ 80,000              
Sale of stock, price per share ( in dollar per share) | $ / shares   $ 9.43              
Preferred stock, shares issued (in shares)     8,483,561            
Preferred stock, shares outstanding (in shares)               8,483,561  
Dividends, preferred stock, cash | $ $ 5,600