Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Operating activities
Net income (loss)	$ 57,523	$ (24,682)	$ 23,414	$ (50,806)	$ 32,841	$ (27,392)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	23,419		20,032		45,963	39,322
Stock-based compensation					15,714	10,594
(Gain) loss on lease termination	(107)		40		(107)	40
Long-lived asset impairment	0		4,584		620	10,411
(Gain) loss on sale or disposal of assets	1,185		7,945		(638)	9,530
Provision for losses on accounts receivable					1,117	491
Noncash lease expense					29,661	28,286
Accretion of original debt issuance discount					1,271	1,178
Noncash interest					2,106	1,567
Deferred income taxes					3,705	7,221
Change in assets and liabilities, net of acquisitions:
Receivables and contracts in transit					(124,242)	(106,160)
Inventories					(171,390)	39,353
Prepaid expenses and other assets					(827)	(19,515)
Accounts payable and other accrued expenses					156,840	121,073
Payment pursuant to Tax Receivable Agreement					0	(12,943)
Deferred revenues					1,612	6,879
Operating lease liabilities					(31,437)	(29,145)
Other, net					(7,404)	3,551
Net cash (used in) provided by operating activities					(44,595)	84,341
Investing activities
Purchases of property and equipment					(49,696)	(48,553)
Proceeds from sale of property and equipment					2,966	3,583
Purchases of real property					(72,386)	(1,243)
Proceeds from the sale of real property					9,843	31,195
Purchases of businesses, net of cash acquired					(81,154)	(62,323)
Proceeds from divestiture of business					10,349	19,957
Purchases of intangible assets					0	(142)
Proceeds from sale of intangible assets					0	2,595
Net cash used in investing activities					(180,078)	(54,931)
Financing activities
Proceeds from long-term debt					0	55,624
Payments on long-term debt					(12,537)	(57,351)
Net proceeds (payments) on notes payable - floor plan, net					168,108	(19,160)
Borrowings on revolving line of credit					0	43,000
Payments on revolving line of credit					0	(32,000)
Payments on finance leases					(3,637)	(3,682)
Payments on sale-leaseback arrangement					(102)	(97)
Payment of debt issuance costs					0	(876)
Payments of stock offering costs					(572)	0
Dividends on Class A common stock					(15,652)	(11,274)
Proceeds from exercise of stock options					0	51
RSU shares withheld for tax					(1,175)	(754)
Distributions to holders of LLC common units					(98)	(18,795)
Net cash provided by (used in) financing activities					134,335	(45,314)
Decrease in cash and cash equivalents					(90,338)	(15,904)
Cash and cash equivalents at beginning of the period		$ 208,422		$ 39,647	208,422	39,647	$ 39,647
Cash and cash equivalents at end of the period	$ 118,084		$ 23,743		$ 118,084	$ 23,743	$ 208,422