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Commitments and Contingencies - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Claim amounts that affect ultimate liability	$ 100
Payments for general liability per occurrence	350
Maximum liability	4,000
Commercial insurance coverage	$ 75,000
Consolidated ownership percentage	50.00%
Minimum
Loss Contingencies [Line Items]
Payments for workers compensation per occurrence	$ 2
Maximum
Loss Contingencies [Line Items]
Payments for workers compensation per occurrence	$ 250

X

- Definition

Commercial Insurance Coverage

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No definition available.

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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.

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Balance Type:	na
Period Type:	instant

X

- Definition

General Liability And Workers Compensation Claim Per Occurrence That Would Affect Ultimate Liability

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No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

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- Definition

Represents self insurance general liability, amount per occurrence.

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No definition available.

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

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- Definition

Represents self insurance workers compensation claims, amount per occurrence.

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No definition available.

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Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Represents self insurance workers compensation claims, maximum liability

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No definition available.

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Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
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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.

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No definition available.

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- Details

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