XML 61 R48.htm IDEA: XBRL DOCUMENT v3.22.0.1

Basis of Presentation and Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) entity	Dec. 31, 2020 USD ($)	Jun. 30, 2020 entity
Financing Receivable, Impaired [Line Items]
Increase in accounts receivable	$ 54,729,000
Allowance for credit loss	0	$ 0
Contract asset retainage	47,308,000	44,412,000
Contract liability retainage	$ 46,882,000	33,856,000
Retainage rate	65.00%
Decrease in contract asset retainage	$ 1,665,000
Increase in contract liability retainage	13,913,000
Contract liability recognized during the period	$ 472,766,000
Contract liability revenue recognized		444,213,000
Consolidated ownership percentage	50.00%
Consolidated 50% owned subsidiaries, number of entities | entity	2		2
Other Current Assets
Financing Receivable, Impaired [Line Items]
Restricted cash	$ 6,853,000	$ 6,457,000
Minimum | Transportation Solutions
Financing Receivable, Impaired [Line Items]
Revenue recognition, percentage of completion range	12 months
Minimum | E-Infrastructure Solutions
Financing Receivable, Impaired [Line Items]
Revenue recognition, percentage of completion range	6 months
Maximum | Transportation Solutions
Financing Receivable, Impaired [Line Items]
Revenue recognition, percentage of completion range	36 months
Maximum | E-Infrastructure Solutions
Financing Receivable, Impaired [Line Items]
Revenue recognition, percentage of completion range	24 months
Building and improvements | Minimum
Financing Receivable, Impaired [Line Items]
Property, plant and equipment, useful life	5 years
Building and improvements | Maximum
Financing Receivable, Impaired [Line Items]
Property, plant and equipment, useful life	39 years
Plant and field equipment | Minimum
Financing Receivable, Impaired [Line Items]
Property, plant and equipment, useful life	5 years
Plant and field equipment | Maximum
Financing Receivable, Impaired [Line Items]
Property, plant and equipment, useful life	20 years

X

- Definition

Consolidated 50% Owned Subsidiaries, Number Of Entities

+ References

No definition available.

+ Details

Name:	strl_Consolidated50OwnedSubsidiariesNumberOfEntities
Namespace Prefix:	strl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Consolidated Entities, Ownership Percentage

+ References

No definition available.

+ Details

Name:	strl_ConsolidatedEntitiesOwnershipPercentage
Namespace Prefix:	strl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Contract With Customer, Liability, Revenue Recognized During the Period

+ References

No definition available.

+ Details

Name:	strl_ContractWithCustomerLiabilityRevenueRecognizedDuringThePeriod
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Retainage Asset, Current

+ References

No definition available.

+ Details

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

X

- Definition

Contract With Customer, Retainage Liability, Current

+ References

No definition available.

+ Details

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

X

- Definition

Contracts Receivable Retainage, Percentage Estimated To Be Collected In Next Fiscal Year

+ References

No definition available.

+ Details

Name:	strl_ContractsReceivableRetainagePercentageEstimatedToBeCollectedInNextFiscalYear
Namespace Prefix:	strl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Increase (Decrease) In Contract With Customer, Retainage Asset

+ References

No definition available.

+ Details

Name:	strl_IncreaseDecreaseInContractWithCustomerRetainageAsset
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Increase (Decrease) In Contract With Customer, Retainage Liability

+ References

No definition available.

+ Details

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

X

- Definition

Represents the length of time the Company's contracts generally take to complete.

+ References

No definition available.

+ Details

Name:	strl_RevenueRecognitionPercentageOfCompletionRange
Namespace Prefix:	strl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

+ Details

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

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

+ Details

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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.

+ Details

Name:	us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

+ Details

Name:	us-gaap_IncreaseDecreaseInAccountsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586

+ Details

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

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=strl_TransportationSolutionsSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=strl_EInfrastructureSolutionsSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: