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FLOOR PLAN NOTES PAYABLE—NON-TRADE - Narrative (Details)
12 Months Ended
Oct. 20, 2023
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Oct. 29, 2021
USD ($)
Oct. 16, 2014
USD ($)
Senior Notes            
Debt Instrument [Line Items]            
Face amount       $ 250,000,000    
2023 Senior Credit Facility            
Debt Instrument [Line Items]            
Debt instrument, variable rate, minimum 0.0100          
2023 Senior Credit Facility | Minimum | Base Rate Component, Federal Funds            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.50%          
2023 Senior Credit Facility | Minimum | Base Rate Component, SOFR            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.00%          
2023 Senior Credit Facility | Minimum | SOFR            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.00%          
2023 Senior Credit Facility | Minimum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.15%          
2023 Senior Credit Facility | Maximum | SOFR            
Debt Instrument [Line Items]            
Basis spread on variable rate 2.00%          
2023 Senior Credit Facility | Maximum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.00%          
New Vehicle Floor Plan Facility | SOFR            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.10%          
New Vehicle Floor Plan Facility | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.10%          
Used Vehicle Floor Plan Facility | SOFR            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.40%          
Used Vehicle Floor Plan Facility | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.40%          
Revolving Credit Facility1 | Minimum | Line of Credit            
Debt Instrument [Line Items]            
Commitment fee percentage   0.15%        
Revolving Credit Facility1 | Maximum | Line of Credit            
Debt Instrument [Line Items]            
Commitment fee percentage   0.40%        
New Vehicle and Used Vehicle Floor Plan | Line of Credit            
Debt Disclosure [Abstract]            
Unused capacity, commitment fee percentage   0.15%        
Debt Instrument [Line Items]            
Unused capacity, commitment fee percentage   0.15%        
Loaner Vehicle Notes Payable - Bank of America            
Debt Instrument [Line Items]            
Notes Payable   $ 56,700,000 $ 127,200,000      
Loaner Vehicle Notes Payable - OEMs            
Debt Instrument [Line Items]            
Notes Payable   $ 161,500,000 $ 111,900,000      
Revolving Credit Facility | 2019 Senior Credit Facility | Bank of America            
Debt Instrument [Line Items]            
Aggregate commitments         $ 500,000,000  
New Vehicle Revolving Floor Plan Facility | 2019 Senior Credit Facility | Bank of America            
Debt Instrument [Line Items]            
Aggregate commitments         1,930,000,000  
Used Vehicle Revolving Floor Plan Facility            
Debt Instrument [Line Items]            
Commitment fee percentage   0.15%        
Used Vehicle Revolving Floor Plan Facility | 2019 Senior Credit Facility | Bank of America            
Debt Instrument [Line Items]            
Aggregate commitments         $ 375,000,000  
Senior Credit Facility | 2019 Senior Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 750,000,000.0        
Standby Letters of Credit | Bank of America            
Debt Instrument [Line Items]            
Face amount   $ 50,000,000.0       $ 50,000,000.0