Cover - shares	3 Months Ended
	Mar. 31, 2021	Apr. 29, 2021
Cover [Abstract]
Document Type	10-Q
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
City Area Code	(443)
Local Phone Number	367-9600
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		17,445,756
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false