Unaudited Condensed Consolidated Income Statements - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue		$ 511,229	$ 217,748	$ 941,837	$ 389,116
Cost of revenue	[1]	323,378	50,317	572,111	74,375
Gross profit		187,851	167,431	369,726	314,741
Operating expenses:
Sales and marketing		95,605	66,135	183,186	134,309
Product, technology, and development		31,354	27,630	62,007	52,794
General and administrative		33,514	26,167	66,635	46,681
Depreciation and amortization		3,836	9,022	7,697	16,689
Total operating expenses		164,309	128,954	319,525	250,473
Income from operations		23,542	38,477	50,201	64,268
Other (expense) income, net		(156)	61	(275)	283
Income before income taxes		23,386	38,538	49,926	64,551
Provision for income taxes		5,325	11,142	13,027	17,604
Consolidated net income		18,061	27,396	36,899	46,947
Net loss attributable to redeemable noncontrolling interest		(1,223)	(656)	(2,295)	(3,466)
Net income attributable to CarGurus, Inc.		19,284	28,052	39,194	50,413
Accretion of redeemable noncontrolling interest to redemption value		29,620		111,620
Net (loss) income attributable to common stockholders - basic		$ (10,336)	$ 28,052	$ (72,426)	$ 50,413
Net (loss) income per share attributable to common stockholders: (Note 9)
Basic		$ (0.09)	$ 0.24	$ (0.61)	$ 0.43
Diluted		$ (0.09)	$ 0.23	$ (0.61)	$ 0.42
Weighted-average number of shares of common stock used in computing net (loss) income per share attributable to common stockholders:
Basic		118,390,641	117,124,895	118,211,975	116,722,913
Diluted		118,390,641	119,454,104	118,211,975	118,353,969
Marketplace [Member]
Revenue		$ 163,926	$ 160,458	$ 327,215	$ 316,259
Cost of revenue	[1]	13,257	11,311	25,466	22,299
Wholesale [Member]
Revenue		75,937	53,514	166,931	67,317
Cost of revenue	[1]	46,518	35,226	104,700	46,352
Product [Member]
Revenue		271,366	3,776	447,691	5,540
Cost of revenue	[1]	$ 263,603	$ 3,780	$ 441,945	$ 5,724

[1] Includes depreciation and amortization expense for the three months ended June 30, 2022 and 2021 and for the six months ended June 30, 2022 and 2021 of $7,398, $1,143, $14,722 and $2,142, respectively.