Description of Business (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Sep. 27, 2021 USD ($) $ / shares shares	Sep. 10, 2021	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Sep. 24, 2021 $ / shares
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Stock split ratio		1,198
Stock holder equity split shares issued (in shares) | shares			1,198
Common stock, par value (in USD per share) | $ / shares			$ 0.01	$ 0.01		$ 0.01
Proceeds from issuance initial public offering | $	$ 94,500		$ 102,638	$ 0	$ 0
Underwriting discounts and commissions | $			$ 7,890	$ 0	$ 0
Sterling Check Corp.
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership percentage			62.60%
Existing Stockholders
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of shares issued in transaction (in shares) | shares	11,667,750
IPO
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of shares issued in transaction (in shares) | shares	4,760,000
Underwriting discounts and commissions | $	$ 6,800
Other offering costs | $	$ 8,100
Sale of stock, consideration not received per transaction | $			$ 200
IPO | Common Stock
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of shares issued in transaction (in shares) | shares	16,427,750
Share price (in USD per share) | $ / shares	$ 23.00
Over-Allotment Option
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of shares issued in transaction (in shares) | shares	2,142,750