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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 |  |  |  |  |  |  |  |

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