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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 |  |  |  |  |

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