Cover Page - shares	3 Months Ended
	Mar. 31, 2023	Apr. 26, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	0-12015
Entity Registrant Name	HEALTHCARE SERVICES GROUP, INC.
Entity Incorporation, State Code	PA
I.R.S. Employer Identification No.	23-2018365
Entity Address, Address Line One	3220 Tillman Drive
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	Bensalem
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19020
City Area Code	215
Local Phone Number	639-4274
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	HCSG
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		74,195,000
Entity Central Index Key	0000731012
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31