Document And Entity Information	3 Months Ended
	Mar. 31, 2021
Cover [Abstract]
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	1-7234
Entity Registrant Name	GP STRATEGIES CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	52-0845774
Entity Address, Address Line One	70 Corporate Center
Entity Address, Address Line Two	11000 Broken Land Parkway, Suite 300,
Entity Address, City or Town	Columbia
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	21044
City Area Code	(443)
Local Phone Number	367-9600
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	GPX
Security Exchange Name	NYSE
Entity Central Index Key	0000070415
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2021