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v3.25.3

LEASE OBLIGATIONS - Narrative (Details) | 9 Months Ended
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Sep. 30, 2025
Lessee, Lease, Description [Line Items] |
Lease termination period | 10 years
Minimum |
Lessee, Lease, Description [Line Items] |
Lease renewal term | 1 month
Maximum |
Lessee, Lease, Description [Line Items] |
Lease renewal term | 10 years

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- Definition Lessee, Lease, Renewal Term + References No definition available. + Details
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Namespace Prefix: | strl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Lease, Termination Period + References No definition available. + Details
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Namespace Prefix: | strl_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |