Document and Entity Information Document - shares	6 Months Ended
	Jun. 28, 2019	Jul. 31, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 28, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	CTG
Entity Registrant Name	COMPUTER TASK GROUP INC
Entity Central Index Key	0000023111
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity File Number	1-9410
Entity Tax Identification Number	160912632
Entity Address, Address Line One	800 Delaware Avenue
Entity Address, City or Town	Buffalo
Entity Address, State or Province	New York
Entity Address, Postal Zip Code	14209
City Area Code	716
Local Phone Number	882-8000
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		14,443,915