Represents the number of equal payments of a debt instrument fee.

No definition available.

Name:	strl_DebtInstrumentFeeNumberOfEqualPayments
Namespace Prefix:	strl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the reduction in current line of credit facility availability.

+ References

No definition available.

+ Details

Name:	strl_LineOfCreditAvailabilityReduction
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	strl_Note21SubsequentEventsCEODepartureGoodwillandCovenantComplianceDetailsLineItems
Namespace Prefix:	strl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents tangible net worth.

+ References

No definition available.

+ Details

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

- Definition

Amount of headroom on tangible net worth.

+ References

No definition available.

+ Details

Name:	strl_TangibleNetWorthHeadroom
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Expenditures for salaries for officers and non-officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

+ References

No definition available.

+ Details

Name:	us-gaap_SalariesWagesAndOfficersCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
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Period Type:

Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended	2 Months Ended	0 Months Ended
	Mar. 12, 2015	Mar. 11, 2015	Feb. 02, 2015	Sep. 01, 2015	Jun. 01, 2015	Dec. 31, 2014	Jan. 27, 2015	Jan. 26, 2015
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items]
Tangible Net Worth						$ 86.3strl_TangibleNetWorth
Subsequent Event [Member] \| Seventh Amendment [Member] \| Prime Rate [Member]
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.50%
Subsequent Event [Member] \| Seventh Amendment [Member]
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items]
Line Of Credit Availability Reduction	5
Line of Credit Facility, Maximum Borrowing Capacity	35
Debt Instrument, Interest Rate, Stated Percentage	6.75%
Tangible Net Worth Headroom	11.3
Debt Instrument, Fee Amount	0.4
Debt Instrument, Fee, Number of Equal Payments	4
Subsequent Event [Member] \| Prime Rate [Member]
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Subsequent Event [Member] \| Chief Executive Officer [Member] \| Severance Package [Member]
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items]
Salaries, Wages and Officers' Compensation			1.8
Subsequent Event [Member]
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items]
Share Price (in Dollars per share)							$ 3.97	$ 5.52
Debt Instrument, Interest Rate, Stated Percentage		4.75%
Scenario, Forecast [Member] \| Seventh Amendment [Member]
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items]
Line Of Credit Availability Reduction				10	10
Line of Credit Facility, Maximum Borrowing Capacity				$ 15	$ 25