Cover Page - shares	9 Months Ended
	Sep. 30, 2023	Nov. 01, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-40829
Entity Registrant Name	Sterling Check Corp.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	37-1784336
Entity Address, Address Line One	6150 Oak Tree Boulevard
Entity Address, Address Line Two	Suite 490
Entity Address, City or Town	Independence
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	44131
City Area Code	800
Local Phone Number	853-3228
Title of 12(b) Security	Common stock, $0.01 par value
Trading Symbol	STER
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		94,285,105
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001645070