Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues
Revenue	$ 1,710,703	$ 1,254,619	$ 3,202,570	$ 2,428,198
Lease and rental sales	80,538	61,396	151,873	119,623
Total revenue	1,791,241	1,316,015	3,354,443	2,547,821
Cost of products sold
Lease and rental sales	55,335	48,387	103,896	96,445
Total cost of products sold	1,417,025	1,045,233	2,634,787	2,032,225
Gross profit	374,216	270,782	719,656	515,596
Selling, general and administrative expense	225,327	184,734	449,774	359,689
Depreciation and amortization expense	13,910	13,421	27,584	27,147
Gain on sale of assets	44	164	224	256
Operating income	135,023	72,791	242,522	129,016
Other income	(8,333)	(1,746)	(22,397)	(2,665)
Interest (income) expense, net	(3,168)	212	(4,387)	(295)
Income before taxes	140,188	74,749	260,532	131,386
Income tax provision	(29,515)	(16,705)	(57,406)	(28,009)
Net income	110,673	58,044	203,126	103,377
Less: Net income attributable to noncontrolling interest	446		446
Net income attributable to Rush Enterprises, Inc.	$ 110,227	$ 58,044	$ 202,680	$ 103,377
Net income attributable to Rush Enterprises, Inc. per share of common stock:
Basic (in dollars per share)	$ 1.98	$ 1.04	$ 3.63	$ 1.85
Diluted (in dollars per share)	$ 1.92	$ 1.00	$ 3.52	$ 1.79
Weighted average shares outstanding:
Basic (in shares)	55,640	56,009	55,788	55,819
Diluted (in shares)	57,310	57,956	57,610	57,846
Dividends declared per common share (in dollars per share)	$ 0.19	$ 0.18	$ 0.38	$ 0.36
New and Used Commercial Vehicle [Member]
Revenues
Revenue	$ 1,098,255	$ 797,269	$ 2,033,974	$ 1,544,988
Cost of products sold
Cost of products sold	994,406	719,768	1,829,399	1,396,860
Parts and Service [Member]
Revenues
Revenue	598,298	445,526	1,141,561	861,263
Cost of products sold
Cost of products sold	367,284	277,078	701,492	538,920
Finance and Insurance [Member]
Revenues
Revenue	7,755	7,407	15,280	13,872
Product and Service, Other [Member]
Revenues
Revenue	$ 6,395	$ 4,417	$ 11,755	$ 8,075