XML 226 R66.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Secured Credit Facility and Other Debt - Narrative (Details) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 03, 2020 USD ($) | Apr. 03, 2019 USD ($) | Apr. 03, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | May 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Warrants issued to lenders |  |  |  | $ 0 | $ 3,500,000 | $ 0 |
Amortization of deferred loan costs |  |  |  | 3,250,000 | 2,563,000 | 349,000 |
Notes and deferred payments to sellers |  |  |  | 0 | 11,588,000 | 0 |
Notes payable |  |  |  | 88,755,000 | 98,950,000 |  |
Debt extinguishment |  |  |  |  | 800,000 |  |
Interest expense and accreted interest |  |  |  | 12,350,000 | 9,800,000 | $ 2,628,000 |
Loan and Security Agreement | Senior Secured Term Loans | Wilmington Trust, National Association |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 85,000,000 |  |  |  |
Loan prepayment offer required to make quarterly percentage |  |  | 75.00% |  |  |  |
Debt instrument financial covenants maximum ratio of secured indebtedness to EBITDA, period one |  |  | 2 |  |  |  |
Debt instrument financial covenants maximum ratio of secured indebtedness to EBITDA, period two |  |  | 1.8 |  |  |  |
Debt instrument financial covenants, minimum daily cash collateral, period two |  |  | $ 15,000,000 |  |  |  |
Debt instrument, financial covenants minimum rolling four quarter gross margin in contract backlog, period one |  |  | 65,000,000 |  |  |  |
Debt instrument, financial covenants minimum rolling four quarter gross margin in contract backlog period two |  |  | 70,000,000 |  |  |  |
Debt instrument, financial covenants, maximum incurrence of net capital expenditures during each of four consecutive fiscal quarters |  |  | 15,000,000 |  |  |  |
Debt instrument, financial covenants, minimum bonding capacity |  |  | 1,000,000,000 |  |  |  |
Debt instrument financial covenants minimum EBITDA during each four consecutive fiscal quarters |  |  | 12,000,000 |  |  |  |
Debt issuance costs |  |  | $ 10,400,000 |  |  |  |
Debt instrument, term |  |  | 5 years |  |  |  |
Amortization of deferred loan costs |  |  |  | 2,100,000 | 1,600,000 |  |
Loan and Security Agreement | Senior Secured Term Loans | London Interbank Offered Rate (LIBOR) | Wilmington Trust, National Association |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 8.75% |  |  |  |
Notes Payable for Transportation and Construction Equipment |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  |  |  | 612,000 | 1,557,000 |  |
Equipment-based Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity |  |  |  |  |  |  | $ 40,000,000
Equipment-Based Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity |  |  |  |  |  |  | 20,000,000
Equipment Based Revolving Line Of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity |  |  |  |  |  |  | $ 20,000,000
Warrants to the Lenders Under the Loan Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Warrants issued to lenders |  |  | $ 3,500,000 |  | 3,500,000 |  |
Tealstone |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Promissory notes issued to the sellers |  |  | 5,000,000 |  |  |  |
Cash, net of cash acquired |  |  | 54,861,000 |  |  |  |
Notes and deferred payments to sellers |  |  | $ 11,600,000 |  |  |  |
Accretion expense |  |  |  | $ 1,200,000 | $ 800,000 |  |
Forecast | Tealstone |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Cash, net of cash acquired | $ 7,500,000 | $ 2,426,000 |  |  |  |  |
Minimum | Notes Payable for Transportation and Construction Equipment |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 3 years |  |  |
Stated interest rate |  |  |  | 3.15% |  |  |
Maximum | Notes Payable for Transportation and Construction Equipment |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 5 years |  |  |
Stated interest rate |  |  |  | 6.92% |  |  |
Discount Rate | Tealstone |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Fair value inputs, discount rate |  |  | 0.12 |  |  |  |

X
- Definition Represents the maximum incurrence of net capital expenditures during each of four consecutive fiscal quarters under the financial covenants pursuant to a debt instrument. + References No definition available. + Details
Name: | strl_DebtInstrumentFinancialCovenantsMaximumIncurrenceOfNetCapitalExpendituresDuringEachOfFourConsecutiveFiscalQuarters
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the maximum ratio of secured indebtedness to EBITDA, for a certain specified first period of time following the current date, under the financial covenants pursuant to a debt instrument. + References No definition available. + Details
Name: | strl_DebtInstrumentFinancialCovenantsMaximumRatioOfSecuredIndebtednessToEBITDAPeriodOne
Namespace Prefix: | strl_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum ratio of secured indebtedness to EBITDA, for a certain specified second period of time following the current date, under the financial covenants pursuant to a debt instrument. + References No definition available. + Details
Name: | strl_DebtInstrumentFinancialCovenantsMaximumRatioOfSecuredIndebtednessToEBITDAPeriodTwo
Namespace Prefix: | strl_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the minimum bonding capacity under the financial covenants pursuant to a debt instrument. + References No definition available. + Details
Name: | strl_DebtInstrumentFinancialCovenantsMinimumBondingCapacity
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the minimum daily cash collateral, for a certain specified second period of time following the current date, under the financial covenants pursuant to a debt instrument. + References No definition available. + Details
Name: | strl_DebtInstrumentFinancialCovenantsMinimumDailyCashCollateralPeriodTwo
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the minimum EBITDA during each four consecutive fiscal quarters, for a certain specified period of time following the current date, under the financial covenants pursuant to a debt instrument. + References No definition available. + Details
Name: | strl_DebtInstrumentFinancialCovenantsMinimumEBITDADuringEachFourConsecutiveFiscalQuarters
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the minimum rolling four quarter gross margin in contract backlog, for a certain specified first period of time following the current date, under the financial covenants pursuant to a debt instrument. + References No definition available. + Details
Name: | strl_DebtInstrumentFinancialCovenantsMinimumRollingFourQuarterGrossMarginInContractBacklogPeriodOne
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the minimum rolling four quarter gross margin in contract backlog, for a certain specified second period of time following the current date, under the financial covenants pursuant to a debt instrument. + References No definition available. + Details
Name: | strl_DebtInstrumentFinancialCovenantsMinimumRollingFourQuarterGrossMarginInContractBacklogPeriodTwo
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cost of borrowed funds accounted for as interest that was charged against earnings during the period. And, includes amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. + References No definition available. + Details
Name: | strl_InterestExpenseAndAccretedInterest
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the percentage of excess cash flow, plus accrued and unpaid interest thereon and a prepayment premium, required to be made quarterly to the lenders to prepay the loan. + References No definition available. + Details
Name: | strl_LoanPrepaymentOfferRequiredToMakeQuarterlyPercentage
Namespace Prefix: | strl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of notes payable and deferred payments that an Entity incurred in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References No definition available. + Details
Name: | strl_NoncashOrPartNoncashAcquisitionNotesPayableAndDeferredPaymentsIncurred
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Promissory Note Issued + References No definition available. + Details
Name: | strl_NoncashorPartNoncashAcquisitionNoncashFinancialorEquityInstrumentConsiderationPromissoryNoteIssued
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
Name: | us-gaap_AccretionExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
Name: | us-gaap_AmortizationOfFinancingCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(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

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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_DebtInstrumentMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
Name: | us-gaap_DeferredFinanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermNotesPayable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The value of the noncash (or part noncash) consideration given (for example, liability, equity) in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
Name: | us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfDebtExtinguishmentCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=strl_SeniorSecuredTermLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=strl_WilmingtonTrustNationalAssociationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
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_LongtermDebtTypeAxis=strl_NotesPayableForTransportationAndConstructionEquipmentMember
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_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |