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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	0 Months Ended
	Jun. 30, 2014	Jun. 30, 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		5,499	3,989
Earnings distributed	(1,200)
Total liability		$ 24,299	$ 23,989

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- Details

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- Definition

Represents the mandatory earnings distribution to non-controlling interest.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

The Member's interest subject to mandatory redemption.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

The undistributed earnings to mandatory redeemable interest.

+ References

No definition available.

+ Details

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

Amount that would be paid, determined under the conditions specified in the contract, if 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

+ Details

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