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Document and Entity Information
Jun. 18, 2021
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jun. 18, 2021
Entity Registrant Name GARTNER, INC.
Entity Incorporation, State or Country Code DE
Entity File Number 1-14443
Entity Tax Identification Number 04-3099750
Entity Address, Address Line One P.O. Box 10212
Entity Address, Address Line Two 56 Top Gallant Road
Entity Address, City or Town Stamford
Entity Address, State or Province CT
Entity Address, Postal Zip Code 06902-7700
City Area Code 203
Local Phone Number 316-1111
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.0005 per value per share
Trading Symbol IT
Security Exchange Name NYSE
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0000749251