Unaudited Condensed Consolidated Income Statements - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Revenue
Total revenue		$ 231,963	$ 430,608
Cost of Goods and Services Sold [Abstract]
Total cost of revenue	[1]	76,983	248,733
Gross profit		154,980	181,875
Operating expenses:
Sales and marketing		75,577	87,581
Product, technology, and development		36,607	30,653
General and administrative		24,919	33,121
Depreciation and amortization		3,818	3,861
Total operating expenses		140,921	155,216
Income from operations		14,059	26,659
Other income (expense), net:
Interest income		3,743	37
Other income (expense), net		595	(156)
Total other income (expense), net		4,338	(119)
Income before income taxes		18,397	26,540
Provision for income taxes		6,531	7,702
Consolidated net income		11,866	18,838
Net loss attributable to redeemable noncontrolling interest		(4,266)	(1,072)
Net income attributable to CarGurus, Inc.		16,132	19,910
Accretion of redeemable noncontrolling interest to redemption value			82,000
Net income (loss) attributable to common stockholders - basic		$ 16,132	$ (62,090)
Net income (loss) per share attributable to common stockholders: (Note 10)
Basic		$ 0.14	$ (0.53)
Diluted		$ 0.10	$ (0.53)
Weighted-average number of shares of common stock used in computing net income (loss) per share attributable to common stockholders:
Basic		115,358,475	118,031,325
Diluted		115,915,737	118,031,325
Marketplace [Member]
Revenue
Total revenue		$ 167,127	$ 163,289
Cost of Goods and Services Sold [Abstract]
Total cost of revenue	[1]	15,533	12,209
Wholesale [Member]
Revenue
Total revenue		25,186	90,994
Cost of Goods and Services Sold [Abstract]
Total cost of revenue	[1]	22,068	58,182
Product [Member]
Revenue
Total revenue		39,650	176,325
Cost of Goods and Services Sold [Abstract]
Total cost of revenue	[1]	$ 39,382	$ 178,342

[1] Includes depreciation and amortization expense for the three months ended March 31, 2023 and 2022 of $7,758 and $7,324, respectively.