Organization, Consolidation and Presentation of Financial Statements

No definition available.

Name:	ster_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems
Namespace Prefix:	ster_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Other offering cost.

+ References

No definition available.

+ Details

Name:	ster_PaymentsOfStockIssuanceCostsOther
Namespace Prefix:	ster_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-15

+ Details

Name:	us-gaap_PaymentsOfStockIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from entity's first offering of stock to the public.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-14

+ Details

Name:	us-gaap_ProceedsFromIssuanceInitialPublicOffering
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481549/505-30-45-1

+ Details

Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	srt_OwnershipAxis=ster_SterlingCheckCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ster_ExistingStockholdersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_TreasuryStockCommonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=ster_BroadStreetPrincipalInvestmentsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ster_CertainSellingStockholdersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=ster_GoldmanSachsCoLLCAndJPMorganSecuritiesLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=ster_SecondaryPublicOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Description of Business (Details) - USD ($)					12 Months Ended
Description of Business (Details) - USD ($)	Jun. 30, 2023	Jun. 12, 2023	Jun. 05, 2023	Sep. 27, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 24, 2021	Sep. 10, 2021
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Common stock, par value (in USD per share)					$ 0.01	$ 0.01		$ 0.01	$ 0.01
Proceeds from issuance initial public offering				$ 94,500,000	$ 0	$ 0	$ 102,638,000
Underwriting discounts and commissions					$ 0	$ 225,000	$ 7,890,000
Common stock repurchased (in shares)					5,289,607	939,417
Value of common stock repurchased					$ 68,362,000	$ 13,962,000
Sterling Check Corp.
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership percentage					53.40%
Existing Stockholders
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of shares issued in transaction (in shares)				11,667,750
Common Stock
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Common stock repurchased (in shares)					5,289,607	939,417
Common Stock Held in Treasury
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Common stock repurchased (in shares)					5,289,607	939,417
Value of common stock repurchased					$ 68,362,000	$ 13,962,000
Common Stock Held in Treasury \| BSPI
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Common stock repurchased (in shares)			1,000,000
Value of common stock repurchased			$ 11,700,000
IPO
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of shares issued in transaction (in shares)				4,760,000
Underwriting discounts and commissions				$ 6,800,000
Other offering costs				$ 8,100,000
IPO \| Common Stock
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of shares issued in transaction (in shares)				16,427,750
Share price (in USD per share)				$ 23.00
Over-Allotment Option
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of shares issued in transaction (in shares)				2,142,750
Over-Allotment Option \| Selling Stockholders \| Underwriters
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of shares issued in transaction (in shares)	1,145,486
Secondary Public Offering \| Underwriters
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of shares issued in transaction (in shares)	0
Proceeds from sale of stock	$ 0
Secondary Public Offering \| Selling Stockholders
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Common stock, par value (in USD per share)		$ 0.01
Number of shares issued in transaction (in shares)		8,000,000