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Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |  |  |
Goodwill - Franchise Segment | $ 595,500 |  |  | $ 595,500 |  | $ 331,200 | $ 229,800
Goodwill - Preowned Segment | 0 |  |  | 0 |  | 0 | 0
Goodwill - Powersports Segment | 27,800 |  |  | 27,800 |  | 27,300 | 24,000
GW Accm Amort Fdealer |  |  |  |  |  | 1,100,000 |
GW Amm Amort Preowned |  |  |  |  |  | 202,900 |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment charges | 0 | $ 0 |  | (173,800) | $ (2,400) |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill - Preowned Segment | 0 |  |  | 0 |  | 0 | 0
Goodwill and Intangible Asset Impairment |  |  | $ (200) |  |  |  |
Goodwill | 623,300 |  |  | 623,300 |  | 358,500 | 253,800
Goodwill and Intangible Assets Acquired |  |  | 11,400 | 263,900 |  |  |
Goodwill - Franchise Segment | 595,500 |  |  | 595,500 |  | 331,200 | 229,800
Goodwill - Powersports Segment | 27,800 |  |  | 27,800 |  | 27,300 | 24,000
PY Acq GW Allocations |  |  | 93,500 | 1,600 |  |  |
PY Acq GW Allocations Fdealer |  |  |  | 1,100 |  | 93,500 |
PY Acq GW Allocations Preowned |  |  | 0 | 0 |  |  |
PY Acq GW Allocations Powersports |  |  | 0 | 500 |  |  |
Goodwill and Intangible Assets Acquired Fdealer |  |  | 8,100 | 263,900 |  |  |
Goodwill and Intangible Assets Acquired Preowned |  |  | 0 | 0 |  |  |
Goodwill and Intangible Assets Acquired Powersports |  |  | 3,300 | 0 |  |  |
Intangible Assets - Reductions from Dispositions Franchised |  |  |  | (700) |  |  |
Intangible Assets - Reductions from dispositions Total |  |  |  | (700) |  |  |
GW Asset Impairment Fdealer |  |  | (200) |  |  |  |
GW Asset Impairment Preowned |  |  | 0 | 0 |  |  |
GW Asset Impairment Powersports |  |  | 0 | 0 |  |  |
Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Franchise Assets - Franchised | 211,600 |  |  | 211,600 |  | 382,600 | 371,700
Intangible Assets Preowned | 0 |  |  | 0 |  | 0 | 0
Intangible Assets - Powersports | 40,500 |  |  | 40,500 |  | 47,700 | 45,700
Franchise Assets - Assets Acquired Franchised |  |  | 10,900 |  |  |  |
Intangible Assets - Assets Acquired Preowned |  |  | 0 |  |  |  |
Intangible Assets - Assets Acquired Powersports |  |  | 2,000 |  |  |  |
Indefinite-Lived Intangible Assets Acquired |  |  | 12,900 |  |  |  |
Franchise Assets - reductions from disp fdealer |  |  |  | (5,100) |  |  |
Intangible Assets - reduction from dispositions preowned |  |  |  | 0 |  |  |
Intangible Assets - Reductions from dispositions powersports |  |  |  | (700) |  |  |
Indefinite-Lived Intangible Assets, Written off Related to Sale of Business Unit |  |  |  | 5,800 |  |  |
Franchise Assets Reductions from impairment fdealer |  |  |  | (165,900) |  |  |
Intangible assets - Reductions from impairment preowned |  |  |  | 0 |  |  |
Intangible assets - Reductions from impairment powersports |  |  |  | (6,500) |  |  |
Goodwill and Intangible Asset Impairment |  |  | $ (200) |  |  |  |
Other Intangible Assets, net | $ 252,100 |  |  | 252,100 |  | $ 430,300 | $ 417,400
Reductions from impairment, total |  |  |  | (172,400) |  |  |
EchoPark Segment [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment charges |  |  |  | 200 | $ 1,400 |  |
Powersports Segment |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment charges |  |  |  | $ 7,200 |  |  |

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