| Document and Entity Information | Feb. 29, 2024 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001645070 |
| Document Type | 8-K |
| Document Period End Date | Feb. 29, 2024 |
| Entity Registrant Name | Sterling Check Corp. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-40829 |
| 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 | 1 (800) |
| Local Phone Number | 853-3228 |
| Written Communications | true |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common stock, par value $0.01 per share |
| Trading Symbol | STER |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
