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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Nov. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Payments for workers compensation per occurrence	$ 250
Payments for general liability per occurrence	5,900
Commercial insurance coverage	$ 75,000
Consolidated ownership percentage	50.00%	50.00%

X

- Definition

Commercial Insurance Coverage

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No definition available.

+ Details

Name:	strl_CommercialInsuranceCoverage
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Consolidated Entities, Ownership Percentage

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No definition available.

+ Details

Name:	strl_ConsolidatedEntitiesOwnershipPercentage
Namespace Prefix:	strl_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents self insurance general liability, amount per occurrence.

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No definition available.

+ Details

Name:	strl_SelfInsuranceGeneralLiabilityAmountPerOccurrence
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents self insurance workers compensation claims, amount per occurrence.

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No definition available.

+ Details

Name:	strl_SelfInsuranceWorkersCompensationClaimsAmountPerOccurrence
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration