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Document And Entity Information
Sep. 23, 2019
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Sep. 23, 2019
Entity Registrant Name GROUP 1 AUTOMOTIVE INC
Entity Central Index Key 0001031203
Entity Emerging Growth Company false
Entity File Number 1-13461
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 76-0506313
Entity Address, Address Line One 800 Gessner
Entity Address, Address Line Two Suite 500
Entity Address, City or Town Houston
Entity Address, State or Province TX
Entity Address, Postal Zip Code 77024
City Area Code 713
Local Phone Number 647-5700
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of each class Common Stock, par value $0.01 per share
Trading Symbol GPI
Name of each exchange on which registered NYSE