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Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Detail) - The following table summarizes the initial allocation of the purchase price for JBC and Myers (in thousands): (Parentheticals) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Current assets, including cash (in Dollars)	$ 3,370
JBC [Member]
Current assets, including cash (in Dollars)	4,662
Myers [Member]
Current assets, including cash (in Dollars)	654
Cash paid (in Dollars)	$ 409

X

- Definition

Business acquisition purchase price allocation receivable.

+ References

No definition available.

+ Details

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

X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant