Quarterly report [Sections 13 or 15(d)]

Goodwill and Intangible Assets - Additional Information (Details)

v3.26.3
Goodwill and Intangible Assets - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Jun. 30, 2026
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Intangible Asset, Goodwill and Other [Abstract]              
Goodwill - Franchise Segment $ 395,500     $ 395,500   $ 394,500 $ 331,200
Goodwill - Preowned Segment 0     0   0 0
Goodwill - Powersports Segment 33,000     33,000   27,300 27,300
GW Accm Amort Fdealer           1,100,000  
GW Amm Amort Preowned           202,900  
Intangible Asset, Finite-Lived [Line Items]              
Impairment charges 0 $ 0   (400) $ (173,800)    
Goodwill [Line Items]              
Goodwill - Preowned Segment 0     0   0 0
Intangible Asset, Including Goodwill, Impairment Loss     $ (700)        
Goodwill 428,500     428,500   421,800 358,500
Goodwill and Intangible Assets Acquired     64,200 9,700      
Goodwill - Franchise Segment 395,500     395,500   394,500 331,200
Goodwill - Powersports Segment 33,000     33,000   27,300 27,300
PY Acq GW Allocations     (200)        
PY Acq GW Allocations Fdealer           (200)  
PY Acq GW Allocations Preowned     0        
PY Acq GW Allocations Powersports     0        
Goodwill and Intangible Assets Acquired Fdealer     64,200 4,000      
Goodwill and Intangible Assets Acquired Preowned     0 0      
Goodwill and Intangible Assets Acquired Powersports     0 5,700      
Intangible Assets - Reductions from Dispositions Franchised       (3,000)      
Intangible Assets - Reductions from dispositions Total       (3,000)      
GW Asset Impairment Fdealer     (700)        
GW Asset Impairment Preowned     0 0      
GW Asset Impairment Powersports     0 0      
Intangible Asset, Indefinite-Lived [Line Items]              
Franchise Assets - Franchised 460,000     460,000   413,600 382,600
Intangible Assets Preowned 0     0   0 0
Intangible Assets - Powersports 48,400     48,400   40,500 47,700
Franchise Assets - Assets Acquired Franchised     202,000 63,600      
Intangible Assets - Assets Acquired Preowned     0 0      
Intangible Assets - Assets Acquired Powersports     0 7,900      
Intangible Asset, Indefinite-Lived, Acquired     202,000 71,500      
Franchise Assets - reductions from disp fdealer     (5,100) (17,200)      
Intangible Assets - reduction from dispositions preowned     0 0      
Intangible Assets - Reductions from dispositions powersports     (700) 0      
Intangible Asset, Indefinite-Lived, Divestiture     5,800 17,200      
Franchise Assets Reductions from impairment fdealer     (165,900)        
Intangible assets - Reductions from impairment preowned     0        
Intangible assets - Reductions from impairment powersports     (6,500)        
Intangible Asset, Including Goodwill, Impairment Loss     (700)        
Other Intangible Assets, net $ 508,400     $ 508,400   $ 454,100 $ 430,300
Reductions from impairment, total     $ (172,400)        
EchoPark Segment [Member]              
Intangible Asset, Finite-Lived [Line Items]              
Impairment charges         $ 200