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Block] Interest Finance Lease, Liability, Undiscounted Excess Amount Revenue Revenue from Contract with Customer [Text Block] Weighted average shares outstanding (in shares) Weighted Average Number of Shares Issued, Basic Paid-in Capital Additional Paid-in Capital [Member] Unrealized (loss) gain on cash flow hedges, net of tax expense of $0 Unrealized derivative gain (loss) on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Document Annual Report Document Annual Report Effect of dilutive securities: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] PNC Bank N.A. Citizens Bank N.A. Wells Fargo Bank National Association Bank of America N.A. And BMO Harris Bank National Association PNC Bank N.A. Citizens Bank N.A. Wells Fargo Bank National Association Bank of America N.A. And BMO Harris Bank National Association [Member] PNC Bank N.A. Citizens Bank N.A. Wells Fargo Bank National Association Bank of America N.A. And BMO Harris Bank National Association Cover [Abstract] Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] United States UNITED STATES Other long-term liabilities Other Liabilities, Noncurrent Operating lease, liability, payments, due Lessee, Operating Lease, Liability, to be Paid Revenue remaining performance obligation Revenue, Remaining Performance Obligation, Amount Consideration transferred to acquire operating assets Asset Acquisition, Consideration Transferred Amortization of finance leases Finance Lease, Right-of-Use Asset, Amortization Business Segments Segment Reporting Disclosure [Text Block] Net decrease in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Equity Component [Domain] Equity Component [Domain] Current maturities of long-term debt Finance Lease, Liability, Current State and local State and Local Jurisdiction [Member] Work-in-process Inventory, Work in Process, Net of Reserves Accounts receivable - net (Note 6) Accounts receivable - net Accounts and Financing Receivable, after Allowance for Credit Loss, Current Other Deferred Tax Liabilities, Other Entity Current Reporting Status Entity Current Reporting Status Operating income (loss) Segment Operating Profit Total segment operating profit Operating Income (Loss) Net loss to be recognize during the next fiscal period Defined Benefit Plan, Expected Amortization, Next Fiscal Year Cash and cash equivalents Cash and Cash Equivalents [Member] Total deferred tax liabilities Deferred Tax Liabilities, Gross Corporate expense and other unallocated charges Corporate Expense And Other Unallocated Charges Amount related to corporate expenses, cost of capital elimination, and other unallocated charges. Revenue from External Customers by Products and Services [Table] Revenue from External Customers by Products and Services [Table] Global Friction Management Rail Global Friction Management [Member] Rail Global Friction Management Segments [Axis] Segments [Axis] Costs recovered from environmental cleanup activities Environmental Remediation Expense, Recovery Property, plant and equipment Property, Plant and Equipment, Policy [Policy Text Block] Business combination, term for payment of deferred consideration Business Combination, Payment of Deferred Consideration, Term Business Combination, Payment of Deferred Consideration, Term Revolving credit facility with an interest rate of 7.40% as of December 31, 2023 and 6.93% as of December 31, 2022 Line of credit facility, amount outstanding Long-Term Line of Credit Customer relationships Customer Relationships [Member] Vesting period one Share-Based Payment Arrangement, Tranche One [Member] Maximum leverage ratio Debt Instrument, Covenant, Leverage Ratio, Maximum Debt Instrument, Covenant, Leverage Ratio, Maximum Variable Rate [Domain] Variable Rate [Domain] Net loss attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Entity Voluntary Filers Entity Voluntary Filers Range [Domain] Statistical Measurement [Domain] Customer revenue transferred (percentage) Revenue From Contract With Customer, Percentage Nonvested Shares, Outstanding, Beginning Balance (in shares) Nonvested Shares, Outstanding, Ending Balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Long-Term Debt and Related Matters Debt Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Research and development Research and Development Expense, Policy [Policy Text Block] Revolving Credit Facility Revolving Credit Facility [Member] Fabricated Bridge Fabricated Bridge [Member] Fabricated Bridge Minimum fixed charge coverage ratio Debt Instrument, Covenant, Interest Coverage Ratio, Minimum Debt Instrument, Covenant, Interest Coverage Ratio, Minimum Performance Stock Units Performance Shares [Member] Segment Reporting [Abstract] Segment Reporting [Abstract] Accounts payable Accounts Payable, Current Business combination, acquiree, operating profit Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Operating Leases Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Commercial contracts Long-Term Commercial Contracts [Member] Long-Term Commercial Contracts Expenditures for long-lived assets Segment, Expenditure, Addition to Long-Lived Assets Purchase commitment Long-Term Purchase Commitment, Amount Schedule of Goodwill [Table] Schedule of Goodwill [Table] Geographical [Axis] Geographical [Axis] Foreign Plan Foreign Plan [Member] Income Taxes Income Tax Disclosure [Text Block] Deferred revenue Increase (Decrease) in Contract with Customer, Liability 2028 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Gross property, plant, and equipment Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Property, plant, and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Revenue recognition Revenue [Policy Text Block] Defined contribution plan number Defined Contribution Plan Number Number of defined contribution plans offered by the company. Audit Information [Abstract] Audit Information Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Environmental obligations utilized Accrual for Environmental Loss Contingencies, Payments Business Acquisition [Line Items] Business Acquisition [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Goodwill Goodwill [Roll Forward] Schedule of Investment Allocation and Target Allocation Schedule of Allocation of Plan Assets [Table Text Block] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Treasury stock shares - at cost, common stock (in shares) Treasury Stock, Common, Shares 2024 Defined Benefit Plan, Expected Future Benefit Payment, Year One Accrual for Environmental Loss Contingencies Accrual for Environmental Loss Contingencies [Roll Forward] Right-of-use assets obtained in exchange for new lease liabilities: Right-of-Use Assets Obtained in Exchange for Lease Liabilities [Abstract] Right-of-Use Assets Obtained in Exchange for Lease Liabilities Swap Swap [Member] Net income (loss) attributable to L.B. Foster Company Net income (loss) attributable to L.B. Foster Company Net Income (Loss) Total current liabilities Liabilities, Current Derivative Contract [Domain] Derivative Contract [Domain] 2025 Finance Lease, Liability, to be Paid, Year Two Foreign currency translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Leases Lessee, Operating Leases [Text Block] Corporate bonds Corporate Bond Securities [Member] Precast Concrete Products Precast Concrete Products [Member] Precast Concrete Products Property, plant, and equipment - net (Note 8) Property, plant, and equipment - net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Total debt Debt and Lease Obligation LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Finite-Lived Intangible Assets Finite-Lived Intangible Assets [Line Items] Foreign currency exchange rate changes Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) Purchase of common shares for treasury Stock repurchased during period, value Stock Repurchased During Period, Value Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Proceeds from divestiture of assets Proceeds from Sale of Productive Assets Weighted Average Amortization Period In Years Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Line of credit facility, current borrowing capacity Line of Credit Facility, Current Borrowing Capacity Patents Patents [Member] Goodwill (Note 5) Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Asset Acquisition [Domain] Asset Acquisition [Domain] Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Selling, General and Administrative Expenses Selling, General and Administrative Expenses [Member] Point in time Transferred at Point in Time [Member] Long-term operating lease liabilities (Note 9) Long-term operating lease liabilities Operating Lease, Liability, Noncurrent Revenue from External Customer Revenue from External Customer [Line Items] Debt instrument, term Debt Instrument, Term Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Litigation settlement amount, current Litigation Settlement, Amount Awarded to Other Party, Current Litigation Settlement, Amount Awarded to Other Party, Current Unremitted earnings of foreign subsidiaries Unremitted earnings of foreign subsidiary Deferred Tax Liabilities, Undistributed Foreign Earnings Debt issuance costs Payments of Debt Issuance Costs Income Statement Location [Axis] Income Statement Location [Axis] Accrued pension obligation Liability, Defined Benefit Plan, Noncurrent Share-Based Payment Arrangement, Noncash Expense [Abstract] Schedule of Lessee, Operating Lease, Liability, Maturity Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Dilutive potential common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Changes in benefit obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Number of companies receiving general notice letter Number Of Companies Receiving General Notice Letter Number Of Companies Receiving General Notice Letter Cash and cash equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Defined Contribution Plan [Table] Defined Contribution Plan [Table] Cougar Mountain Precast, LLC Cougar Mountain Precast, LLC [Member] Cougar Mountain Precast, LLC Foreign earnings repatriated Foreign Earnings Repatriated Repayments of debt Repayments of Other Long-Term Debt Products and Services [Domain] Product and Service [Domain] Schedule of Components of Lease Cost Lease, Cost [Table Text Block] Inventories Increase (Decrease) in Inventories Issued for stock-based compensation plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, Forfeited CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Plan Name [Domain] Plan Name [Domain] Weighted average shares adjustment for incentive awards (usd per share) Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments other than Options, Adjustment for Incentive Awards Expected to Vest, Weighted Average Grant Date Fair Value 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 award is now expected to vest. Interest expense - net Interest Expense Share-based compensation, number of shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Use of estimates Use of Estimates, Policy [Policy Text Block] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Entity File Number Entity File Number Present value or proposed remedial work Present Value of Proposed Remedial Work Present Value of Proposed Remedial Work Favorable lease Off-Market Favorable Lease [Member] 2029 and thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five 2026 Long-Term Debt, Maturity, Year Three Decreases based on tax positions for prior periods Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Auditor Firm ID Auditor Firm ID Amortization expense (Note 5) Amortization expense Amortization of Intangible Assets Entity Shell Company Entity Shell Company Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Other liabilities Increase (Decrease) in Other Operating Liabilities Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Line of credit facility, maximum increase in commitments Line Of Credit Facility, Maximum Increase In Commitments Line Of Credit Facility, Maximum Increase In Commitments Improvements to land and leaseholds Improvements To Land And Leaseholds [Member] Improvements to land and leaseholds Contingent liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies Percentage of Plan assets Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] Operating lease cost Operating Lease, Cost Common stock, shares issued (in shares) Common Stock, Shares, Issued Net gain Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Authorized repurchase, annual limitation Stock Repurchase Program, Authorized Amount, Annual Limitation Stock Repurchase Program, Authorized Amount, Annual Limitation Current maturities of long-term debt (Note 10) Less: current maturities Long-Term Debt and Lease Obligation, Current Treasury stock - at cost, common stock, shares at December 31, 2023 and December 31, 2022, 381,844 and 338,952, respectively (Note 11) Treasury Stock, Common, Value Total assets Assets, Fair Value Disclosure 2027 Long-Term Debt, Maturity, Year Four Foreign currency translation adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Balance at Beginning of Year Balance at End of Year SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Number of financial covenants Debt Instrument, Number Of Financial Covenants Debt Instrument, Number Of Financial Covenants Recognition period for compensation expense not yet recognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Comprehensive income (loss) attributable to L.B. Foster Company Comprehensive Income (Loss), Net of Tax, Attributable to Parent Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Funded status at end of year Defined Benefit Plan, Funded (Unfunded) Status of Plan Diluted (loss) earnings per share, Pro forma (usd per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Domestic Tax Authority Domestic Tax Authority [Member] Schedule of Other Income Interest and Other Income [Table Text Block] Entity Address, Street Address Entity Address, Address Line One Depreciation/Amortization: Depreciation, Amortization and Accretion, Net [Abstract] Entity Address, Suite Entity Address, Address Line Two Rail Products Business Unit Rail Products Business Unit [Member] Rail Products Business Unit Decrease in net carrying value of intangible assets Finite-Lived Intangible Assets, Period Increase (Decrease) Deferred Stock Units Deferred Stock Units [Member] Deferred Stock Units 2024 Finance Lease, Liability, to be Paid, Year One Fair Value, Balance Sheet Grouping, Financial Statement Captions Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Defined benefit plan, comprehensive (income) loss Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Revenue remaining performance obligation (percentage) Revenue, Remaining Performance Obligation, Percentage Accrued interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Operating loss carryforwards Operating Loss Carryforwards Contract Assets Contract With Customer Asset After Allowance For Credit Loss Current [Roll Forward] Contract With Customer Asset After Allowance For Credit Loss Current Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Interest deduction carryforward Deferred Tax Asset, Interest Carryforward Income Statement [Abstract] Income Statement [Abstract] Common shares issues net of shares withheld (in shares) Stock Issued During Period, Shares, New Issues Contract assets Increase (Decrease) in Contract with Customer, Asset Defined Benefit Plan, Asset Categories [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Term deposits Cash and Cash Equivalents, Fair Value Disclosure Components of net periodic benefit cost: Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Equity and Incentive Plan Equity and Incentive Plan [Member] Equity and Incentive Plan Net (loss) income attributable to L.B. Foster Company Business Acquisition, Pro Forma Net Income (Loss) Numerator for basic and diluted earnings (loss) per common share: Net Income (Loss) Attributable to Parent [Abstract] Precast Concrete Products Precast Concrete Buildings [Member] Precast Concrete Buildings [Member] Other current assets Other Assets, Current Class of Stock Class of Stock [Line Items] Statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Other assets Assets for Plan Benefits, Defined Benefit Plan Current: Current Federal, State and Local, Tax Expense (Benefit) [Abstract] Inventories - net (Note 7) Inventories - net Inventory, Net Lessee remaining lease term Lessee, Remaining Lease Term Lessee, Remaining Lease Term Land Land [Member] Other Other Investments [Member] Treasury stock acquisitions Payments for Repurchase of Common Stock Fourth Amended And Restated Credit Agreement Fourth Amended And Restated Credit Agreement [Member] Fourth Amended And Restated Credit Agreement Rail Products Rail Products [Member] Rail Products Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Foreign Deferred Foreign Income Tax Expense (Benefit) Acquisitions and Divestitures Mergers, Acquisitions and Dispositions Disclosures [Text Block] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Total fixed income funds Fixed Income Funds [Member] Segments [Domain] Segments [Domain] Fair Value, Hierarchy [Axis] Fair Value Hierarchy and NAV [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Retained earnings Retained Earnings (Accumulated Deficit) Deferred tax liabilities: Deferred Tax Liabilities, Net [Abstract] Current assets: Assets, Current [Abstract] Accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current Leases [Abstract] Entity Address, State Entity Address, State or Province Finance lease liability, payments, due Finance Lease, Liability, to be Paid Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Accounts receivable Increase (Decrease) in Accounts and Other Receivables Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss) [Line Items] Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Customer [Domain] Customer [Domain] Schedule of Inventory Schedule of Inventory, Current [Table Text Block] Revenues from External Customers and Long-Lived Assets Segment Reporting Information Revenues from External Customers and Long-Lived Assets [Line Items] Effective rate Effective Income Tax Rate Reconciliation, Percent Total operating lease liabilities Operating Lease, Liability Investment of noncontrolling interest Noncontrolling Interest, Increase from Subsidiary Equity Issuance Sales of services Service [Member] Asset Acquisition [Axis] Asset Acquisition [Axis] Vesting [Domain] Vesting [Domain] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Additions Charged to Costs and Expenses SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Expenses associated with contributions made Defined Contribution Plan, Cost Less comprehensive loss attributable to noncontrolling interest: Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract] Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Pension and post-retirement benefit plan adjustments Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Plan Name [Axis] Plan Name [Axis] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Earnings Per Share [Abstract] Common stock, par value $0.01, authorized 20,000,000 shares; shares issued at December 31, 2023 and December 31, 2022, 11,115,779; shares outstanding at December 31, 2023 and December 31, 2022, 10,733,935 and 10,776,827, respectively (Note 11) Common Stock, Value, Issued Commercial property Commercial Real Estate [Member] Trademarks and trade names Trade Names [Member] Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Non Domestic Non Domestic [Member] Qualifies a tag to denote that the information in question is the portion held outside of the United States. Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Financing cash flows from finance leases Finance Lease, Principal Payments Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Finance Lease, Liability, Maturity Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Total mutual funds and equities Equity Funds [Member] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other expense (income) - net (Note 19) Other (expense) income - net Other expense (income) - net Other Nonoperating Income (Expense) Entity Filer Category Entity Filer Category Tax on unremitted foreign earnings Effective Income Tax Rate Reconciliation, Unremitted Foreign Earnings, Amount Effective Income Tax Rate Reconciliation, Unremitted Foreign Earnings, Amount Statement [Table] Statement [Table] Business combination, deferred consideration Business Combination, Contingent Consideration, Liability, Noncurrent Current Fiscal Year End Date Current Fiscal Year End Date Authorized repurchase Stock Repurchase Program, Authorized Amount Additions to contract assets Contract with Customer, Asset, Reclassified to Receivable Schedule of Reconciliation of Statutory Income to Income Tax Expense Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Unrecognized tax benefits at beginning of period: Balance at end of period Unrecognized Tax Benefits Undiscovered remedial work Undiscovered Remedial Work Undiscovered Remedial Work Income Tax Authority [Axis] Income Tax Authority [Axis] Equity income in nonconsolidated investment Equity Loss Income and Remeasurement Gain This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This amount also includes other income from the remeasurement of equity investments. Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Base Rate Base Rate [Member] Target share price (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Target Share Price Share-based Compensation Arrangement by Share-based Payment Award, Target Share Price Years 2029-2033 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Buildings Building [Member] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Other adjustments SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Overnight Bank Funding Rate Overnight Bank Funding Rate [Member] Overnight Bank Funding Rate Other Other Income SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Unallocated corporate assets Corporate, Non-Segment [Member] Pension and post-retirement liability Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Litigation settlement amount Litigation Settlement, Amount Awarded to Other Party Accrued payroll and employee benefits Increase (Decrease) in Employee Related Liabilities Statement of Financial Position [Abstract] Loss on asset divestitures Gain (Loss) on Disposition of Business Increase in billings in excess of costs, excluding revenue recognized Contract with Customer, Liability, Increase from Cash Receipts Contract with Customer, Liability, Increase from Cash Receipts Total L.B. Foster Company stockholders’ equity Accumulated other comprehensive loss Equity, Attributable to Parent Unrecognized tax benefit that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Lessee, lease, termination period Lessee, Lease, Termination Period Lessee, Lease, Termination Period Restricted Stock Restricted Stock [Member] Finance leases Finance Lease, Assets And Liabilities, Lessee [Abstract] Finance Lease, Assets And Liabilities, Lessee Secretariat of the Federal Revenue Bureau of Brazil Secretariat of the Federal Revenue Bureau of Brazil [Member] Reporting Unit [Axis] Reporting Unit [Axis] Accumulated amortization Finance Lease, Right-of-Use Asset, Accumulated Amortization Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] UPRR UPRR [Member] The UPRR Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Other Expense (Income) Other Income and Other Expense Disclosure [Text Block] Mutual funds Mutual Fund [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Proceeds from debt Proceeds from Issuance of Other Long-Term Debt Schedule of Product Warranty Liability Schedule of Product Warranty Liability [Table Text Block] Business combination, stock acquire Business combination, stock acquire Total Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Document Fiscal Period Focus Document Fiscal Period Focus Finite lived intangible asset, useful life Weighted Average Amortization Period In Years Finite-Lived Intangible Asset, Useful Life 2027 Lessee, Operating Lease, Liability, to be Paid, Year Four Coatings and Measurement Coatings And Measurement [Member] Coatings And Measurement Schedule of Changes in Fair Value of Plan Assets Schedule of Changes in Fair Value of Plan Assets [Table Text Block] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Weighted Average Amortization Period In Years Weighted Average [Member] Schedule of Revenue from Customer by Major Geographical Region Revenue from External Customers by Geographic Areas [Table Text Block] Foreign tax authority Foreign Tax Authority [Member] Property, plant, and equipment Finance Lease, Right-of-Use Asset, before Accumulated Amortization City Area Code City Area Code Earnings Per Common Share Earnings Per Share [Text Block] Products and Services [Axis] Product and Service [Axis] Schedule of Nonvested Share Activity Schedule of Nonvested Share Activity [Table Text Block] Lessee lease renewal term Lessee, Lease, Renewal Term Lessee, Lease, Renewal Term Over time sales, percentage Over Time Sales, Percent Over Time Sales, Percent Document Fiscal Year Focus Document Fiscal Year Focus Geographical [Domain] Geographical [Domain] Unrealized gain on cash flow hedge, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Receivables [Abstract] Receivables [Abstract] Pension and post-retirement benefit plans benefit, net of tax benefit of $0 and $357, respectively Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Environmental Loss Contingencies Schedule of Environmental Loss Contingencies by Site [Table Text Block] Accrued settlement Deferred Tax Assets, Accrued Settlement Deferred Tax Assets, Accrued Settlement Goodwill and Intangible Assets Disclosure [Abstract] Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income taxes received Income Taxes Paid, Net Product warranty reserve Beginning balance Ending balance Standard Product Warranty Accrual Developed Technology Rights Developed Technology Rights [Member] Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity Other assets Other Assets, Noncurrent Operating lease right-of-use assets - net (Note 9) Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Foreign Current Foreign Tax Expense (Benefit) Warranty reserve Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Over time output method Over Time Output Method [Member] Over Time Output Method Entity Address, City Entity Address, City or Town Income tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Change in Accounting Estimate, Type [Domain] Change in Accounting Estimate, Type [Domain] Rail, Technologies, and Services Rail Technologies And Services Segment [Member] Rail Technologies And Services Segment Schedule of Revenues by Major Product Line Schedule of Revenues by Major Product Line [Table Text Block] Tabular disclosure summarizing sales by major product line. Common stock, shares authorized (in shares) Common Stock, Shares Authorized Company's stock price Achievement of Stock Price Milestone [Member] Achievement of Stock Price Milestone Consideration received from noncontrolling interest Proceeds from Noncontrolling Interests Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Estimated litigation liability, payment due year one Estimated Litigation Liability, Amount Awarded to Other Party, Payment Due Year One Estimated Litigation Liability, Amount Awarded to Other Party, Payment Due Year One Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Product Liability Contingency [Table] Product Liability Contingency [Table] Equity and Incentive Compensation Plan Equity and Incentive Compensation Plan [Member] Equity and Incentive Compensation Plan Relationship to Entity [Domain] Title of Individual [Domain] Amounts attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Escrow deposit Escrow Deposit Paid-in capital Additional Paid in Capital Income taxes Income Tax, Policy [Policy Text Block] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Three UK Government securities Bonds Municipal Bonds [Member] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Amounts recognized in accumulated other comprehensive loss consist of: Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] Issued for stock-based compensation plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company Pnc Bank N.a. Bank Of America N.a. Wells Fargo Bank N.a. Citizens Bank Of Pennsylvania And Branch Banking And Trust Company [Member] PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company [Member] Entity Registrant Name Entity Registrant Name Skratch Skratch Enterprises Ltd [Member] Skratch Enterprises Ltd Member Foreign tax rate differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Two Vesting period two Share-Based Payment Arrangement, Tranche Two [Member] Schedule of Costs of Retirement Plans Schedule of Costs of Retirement Plans [Table Text Block] Noncontrolling interest Equity, Attributable to Noncontrolling Interest Auditor Name Auditor Name Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Entity Central Index Key Entity Central Index Key Net Carrying Amount Gross Carrying Value Finite-Lived Intangible Assets, Gross Finished goods Inventory, Finished Goods, Net of Reserves Income Tax Authority [Domain] Income Tax Authority [Domain] Accrued payroll and employee benefits Employee-related Liabilities, Current Steel Products Steel Products [Member] Steel Products Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Pension and post-retirement benefit plan, tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax Litigation settlement amount, non-current Litigation Settlement, Amount Awarded to Other Party, Non-Current Litigation Settlement, Amount Awarded to Other Party, Non-Current Issuance of common shares, net of shares withheld for taxes Stock Issued During Period, Value, New Issues Foreign tax rate differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Entity [Domain] Entity [Domain] Amendment Flag Amendment Flag Legal Entity [Axis] Legal Entity [Axis] Identifiable intangible assets Finite-Lived Intangible Assets, Net [Abstract] Goodwill and other intangibles Deferred Tax Assets, Goodwill and Intangible Assets Operating lease weighted-average discount rate Operating Lease, Weighted Average Discount Rate, Percent SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Interest expense - net Interest Income (Expense), Net Net interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Finance lease weighted-average remaining lease term Finance Lease, Weighted Average Remaining Lease Term Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Leasehold improvements Leasehold Improvements [Member] Actual gain (loss) on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Net deferred tax (liabilities) assets Deferred Tax Liabilities, Net Diluted weighted average shares outstanding (in shares) Denominator for diluted earnings per common share - adjusted weighted average shares outstanding and assumed conversions (in shares) Weighted Average Number of Shares Outstanding, Diluted Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Capital expenditures on property, plant, and equipment Payments to Acquire Property, Plant, and Equipment 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Finance lease cost: Lease, Cost [Abstract] TOTAL ASSETS Segment Assets Assets 2029 and thereafter Finance Lease, Liability, to be Paid, after Year Five Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition 2028 Long-Term Debt, Maturity, Year Five Accrued settlement Increase (Decrease) in Accrued Settlement Increase (Decrease) in Accrued Settlement Weighted average shares vested (usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Construction in progress Construction in Progress [Member] Long-term portion of accrued settlement (Note 18) Accrued Legal Settlement, Non-Current Accrued Legal Settlement, Non-Current Plan Asset Categories [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Pension Plan Pension Plan [Member] CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Target percentage of plan assets Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Impairment of goodwill and intangible assets Goodwill and intangible asset impairment Goodwill and Intangible Asset Impairment Research tax credit carryforward, amount Deferred Tax Assets, Tax Credit Carryforwards, Research Schedule of Changes in Accumulated Postemployment Benefit Obligations Schedule of Changes in Accumulated Postemployment Benefit Obligations [Table Text Block] Basic weighted average shares outstanding (in shares) Denominator for basic earnings per common share (in shares) Weighted Average Number of Shares Outstanding, Basic Contract assets (Note 4) Contract asset balance opening balance Contract asset balance ending balance Contract with Customer, Asset, after Allowance for Credit Loss Tax on unremitted foreign earnings Effective Income Tax Rate Reconciliation, Unremitted Foreign Earnings, Percent Effective Income Tax Rate Reconciliation, Unremitted Foreign Earnings, Percent Depreciation Deferred Tax Liabilities, Property, Plant and Equipment Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Debt Instrument, Redemption, Period Two Debt Instrument, Redemption, Period Two [Member] Number of defined benefit plans Defined Benefit Plan Number Number of defined benefit plans offered by the company. Omnibus Plan and Equity and Incentive Plan Omnibus Plan and Equity and Incentive Plan [Member] Omnibus Plan and Equity and Incentive Plan Total cost of sales Cost of Revenue Transfers to receivables from contract assets Contract With Customer Asset Additions Contract With Customer Asset Additions Statement Statement [Line Items] Noncontrolling Interest Noncontrolling Interest [Member]