XML 101 R86.htm IDEA: XBRL DOCUMENT
v3.22.4

Stock Incentive Plan - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 03, 2017 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Value of shares withheld for taxes |  | $ 9,416 | $ 7,338 | $ 1,985 |
Warrants exercised (in shares) |  |  | 530,000 | 470,000 |
Stock issued during period (in shares) |  |  | 315,000 | 110,000 |
Stock issued related to warrants exercised |  |  | $ 8,082 | $ 1,477 |
Warrants outstanding (in shares) |  |  | 0 |  |
Additional Paid in Capital |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Value of shares withheld for taxes |  | 9,413 | $ 7,039 | $ 140 |
RSAs |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Total compensation cost attributable to shares awarded |  | $ 633 |  |  |
Grants in the period (in shares) |  | 26,000 | 29,000 | 51,000 |
Grants in the period (in dollars per share) |  | $ 23.43 | $ 23.19 | $ 8.73 |
Fair value of shares vested in period |  | $ 673 | $ 506 | $ 799 |
Vested (in shares) |  | 29,000 |  |  |
Vested (in dollars per share) |  | $ 23.19 |  |  |
Shares withheld for taxes (in shares) |  |  | 1,000 | 11,000 |
Value of shares withheld for taxes |  |  | $ 27 | $ 140 |
RSUs |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Total compensation cost attributable to shares awarded |  | $ 3,072 |  |  |
Share vesting period |  | 3 years |  |  |
Grants in the period (in shares) |  | 186,000 | 151,000 | 169,000 |
Grants in the period (in dollars per share) |  | $ 28.35 | $ 21.29 | $ 13.52 |
Fair value of shares vested in period |  | $ 2,818 | $ 2,742 | $ 2,918 |
Vested (in shares) |  | 151,000 |  |  |
Vested (in dollars per share) |  | $ 18.66 |  |  |
PSUs |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Total compensation cost attributable to shares awarded |  | $ 6,476 |  |  |
Share vesting period |  | 3 years |  |  |
Grants in the period (in shares) |  | 166,000 | 397,000 | 176,000 |
Grants in the period (in dollars per share) |  | $ 26.52 | $ 21.88 | $ 14.06 |
Fair value of shares vested in period |  | $ 10,508 | $ 7,842 | $ 1,620 |
Vested (in shares) |  | 710,000 |  |  |
Vested (in dollars per share) |  | $ 14.80 |  |  |
RSUs and PSUs |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Shares withheld for taxes (in shares) |  | 330,000 | 311,000 | 123,000 |
Value of shares withheld for taxes |  | $ 9,416 | $ 7,311 | $ 1,845 |
Liability-Based Awards | Additional Paid in Capital |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Total compensation cost attributable to shares awarded |  | 1,225 | 0 | 0 |
Warrants to the Lenders Under the Loan Agreement | Loan and Security Agreement |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Warrants, term | 5 years |  |  |  |
Number of warrants (in shares) | 1,000,000 |  |  |  |
Warrant exercise price (in dollars per share) | $ 10.25 |  |  |  |
Stock Incentive Plan & ESPP |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Total compensation cost attributable to shares awarded |  | $ 10,301 | 11,771 | 11,643 |
Stock Incentive Plan |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of shares authorized to issue (in shares) |  |  |  |  | 3,400,000
Number of shares available for grant (in shares) |  | 397,000 |  |  |
Unrecognized compensation cost |  | $ 10,900 |  |  |
Weighted-average recognition period |  | 2 years 4 months 24 days |  |  |
Stock Incentive Plan | RSAs, RSUs and PSUs |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Total compensation cost attributable to shares awarded |  | $ 10,181 | 11,687 | 11,572 |
ESPP |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of shares available for grant (in shares) |  | 692,000 |  |  |
ESPP | Employee Stock |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Total compensation cost attributable to shares awarded |  | $ 120 | $ 84 | $ 71 |
Maximum annual contribution per employee |  | 15.00% |  |  |
Maximum annual contribution amount |  | $ 25 |  |  |
Purchase price of common stock percent |  | 85.00% |  |  |

X
- Definition Class of Warrant or Right, Number of Warrants Exercised + References No definition available. + Details
Name: | strl_ClassOfWarrantOrRightNumberOfWarrantsExercised
Namespace Prefix: | strl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the term or warrants or rights. + References No definition available. + Details
Name: | strl_ClassOfWarrantOrRightTerm
Namespace Prefix: | strl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Maximum Annual Contributions Per Employee, Amount + References No definition available. + Details
Name: | strl_SharebasedCompensationArrangementbySharebasedPaymentAwardMaximumAnnualContributionsPerEmployeeAmount
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Maximum Annual Contributions Per Employee, Percent + References No definition available. + Details
Name: | strl_SharebasedCompensationArrangementbySharebasedPaymentAwardMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | strl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock Issued During Period, Shares, Warrants Exercised + References No definition available. + Details
Name: | strl_StockIssuedDuringPeriodSharesWarrantsExercised
Namespace Prefix: | strl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock Issued During Period, Value, Warrants Exercised + References No definition available. + Details
Name: | strl_StockIssuedDuringPeriodValueWarrantsExercised
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement. + References No definition available. + Details
Name: | us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement. + References No definition available. + Details
Name: | us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
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_SubsidiarySaleOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AdditionalPaidInCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=strl_RestrictedStockAwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PhantomShareUnitsPSUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=strl_RestrictedStockUnitsAndPhantomStockUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=strl_LiabilityBasedAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=strl_WarrantsToTheLendersUnderTheLoanAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=strl_LoanAndSecurityAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=strl_StockIncentivePlanAndEmployeeStockPurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=strl_StockIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=strl_RestrictedStockAwardsRestrictedStockUnitsAndPerformanceStockUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=strl_EmployeeStockPurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |