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Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Noncontrolling Interest [Line Items]
Members’ interest subject to mandatory redemption	$ 40,000		$ 40,000
Net accumulated earnings	600	$ 0
Myers
Noncontrolling Interest [Line Items]
Cash Surrender Value of Life Insurance	20,000
RHB
Noncontrolling Interest [Line Items]
Cash Surrender Value of Life Insurance	20,000
Variable Interest Entity, Primary Beneficiary
Noncontrolling Interest [Line Items]
Members’ interest subject to mandatory redemption	40,000
Variable Interest Entity, Primary Beneficiary | Myers
Noncontrolling Interest [Line Items]
Members’ interest subject to mandatory redemption	20,000
Variable Interest Entity, Primary Beneficiary | RHB
Noncontrolling Interest [Line Items]
Members’ interest subject to mandatory redemption	$ 20,000

X

- Definition

The Member's interest subject to mandatory redemption.

+ References

No definition available.

+ Details

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Namespace Prefix:	strl_
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X

- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765

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- Definition

Amount before tax of income (loss) of subsidiary attributable to the parent entity.

+ References

No definition available.

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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

No definition available.

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- Details

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- Details

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