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Document and Entity Information
Jan. 09, 2024
Document And Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Jan. 09, 2024
Entity Registrant Name CarGurus, Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-38233
Entity Tax Identification Number 04-3843478
Entity Address Address Line 1 55 Cambridge Parkway
Entity Address Address Line 2 6th Floor
Entity Address City Or Town Cambridge
Entity Address State Or Province MA
Entity Address Postal Zip Code 02142
City Area Code 617
Local Phone Number 354-0068
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Class A Common Stock, par value $0.001 per share
Trading Symbol CARG
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0001494259
Former Address [Member]  
Document And Entity Information [Line Items]  
Entity Address Address Line 1 2 Canal Park
Entity Address Address Line 2 4th Floor
Entity Address City Or Town Cambridge
Entity Address State Or Province MA
Entity Address Postal Zip Code 02141