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Note 9 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) - Mandatorily Redeemable Noncontrolling Interest Liability (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Mandatorily Redeemable Noncontrolling Interest Liability [Abstract]
Member’s interest subject to mandatory redemption	$ 20,000	$ 20,000
Undistributed earnings attributable to this interest	4,169	3,989
Total liability	$ 24,169	$ 23,989

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- Details

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- Definition

The Member's interest subject to mandatory redemption.

+ References

No definition available.

+ Details

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Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

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- Definition

The undistributed earnings to mandatory redeemable interest.

+ References

No definition available.

+ Details

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Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The amount that would be paid, determined under the conditions specified in the contract, if as of the reporting date, the holder of the share has the right to redeem the shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22047-110879

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