Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Segment State Store store reporting_unit Dealerships Brand Collision shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | Segment	3
Number of new vehicle dealerships | Dealerships	134
Number of states | State	18
Number of different brands of cars and light trucks | Brand	28
Number of collision repair centers | Collision	16
Operating lease liabilities	$ 249,100
ROU assets	222,600	$ 260,700
Amount recognized for floor plan assistance	$ 58,700	51,500	$ 46,500
Term for funding of finance contracts	10 days
Contracts in transit included in receivables, net	$ 275,600	216,800
Receivables, net	$ 528,100	462,400
Number of reporting units | reporting_unit	3
Goodwill	$ 253,800	231,000	416,400
Concentrations of credit risk with respect to receivables are limited primarily to receivables from automobile manufacturers	105,300	68,100
Advertising expense	92,200	95,400	61,600
Cooperative manufacturer credits advertising expenses	$ 34,700	30,800	$ 22,100
Number of reportable Segment | Segment	3
Manufacturer Receivables included in receivables, net	$ 105,300	68,100
Other Receivables included in receivables, net	147,200	177,500
Goodwill, Impairment Loss	0
Property and equipment impairment charges	$ 42,700	$ 1,100
Weighted Average Number of Shares Outstanding, Diluted, Adjustment | shares	900	1,000	1,900
BMW [Domain]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	20.00%
Mercedes [Domain]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	11.00%
Northwest Motorsport
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of Stores | Store	11
Financial institutions
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Concentrations of credit risk with respect to receivables are limited primarily to receivables from financial institutions	$ 317,900	$ 255,900
Franchise assets
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Franchise asset impairment charge	0
Continuing operations | Franchise assets
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Franchise asset impairment charge	$ 116,400
Dealership
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Percentage of dealership that is accounted for under the equity method	50.00%
Franchised Dealerships [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of Stores | Store	108
Echo Park [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of Stores | Store	25
Number of states | store	11
Powersports Dealerships
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of Stores | store	13
Powrsports
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of states | store	2