Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Reserve for uncollectible accounts, expense Current period provision Accounts Receivable, Credit Loss Expense (Reversal) Other long-term liabilities Increase (Decrease) in Other Noncurrent Liabilities Deferred tax assets (Note 9) Deferred Income Tax Assets, Net Entity Address, Postal Zip Code Entity Address, Postal Zip Code Debt Instrument [Axis] Debt Instrument [Axis] Finance leases and financing agreements Finance Lease, Liability Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Contract With Customer Liability [Roll Forward] Contract With Customer Liability [Roll Forward] Contract With Customer Liability Income Tax Disclosure [Abstract] Current maturities of long-term debt (Note 7) Less current maturities Long-Term Debt and Lease Obligation, Current Paid-in capital Additional Paid in Capital Number of potentially responsible parties included in agreement Number of Potentially Responsible Parties Included in Agreement Number of Potentially Responsible Parties Included in Agreement Line of credit, accordion feature, lower borrowing capacity Line of Credit, Accordion Feature, Lower Borrowing Capacity Option Line of Credit, Accordion Feature, Lower Borrowing Capacity Option Range [Domain] Statistical Measurement [Domain] Depreciation Depreciation Defined benefit plan, expected future employer contributions, current fiscal year Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year Net periodic pension (income) cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Property, plant, and equipment - net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Contract assets transferred to receivables Transfers from contract asset balance to accounts receivable Contract with Customer, Asset, Reclassified to Receivable Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Net loss attributable to L.B. Foster Company Net Income (Loss) Attributable to Parent Payment period Litigation Settlement Installment Payment Term Litigation Settlement Installment Payment Term Anti-dilutive shares (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Amortization of prior service costs and transition amount Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Accounts Receivable Additional Disclosures [Abstract] Equity Component [Domain] Equity Component [Domain] Total assets Assets, Fair Value Disclosure Total Debt and Lease Obligation Treasury stock - at cost, 306,068 and 338,952 common stock shares at March 31, 2023 and December 31, 2022, respectively Treasury Stock, Common, Value Contract assets - net (Note 3) Contract assets Balance as of December 31, 2022 Balance as of March 31, 2023 Contract with Customer, Asset, after Allowance for Credit Loss 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 Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Derivative Instrument [Axis] Derivative Instrument [Axis] Goodwill [Line Items] Goodwill [Line Items] Statement of Cash Flows [Abstract] Revolving credit facility Line of credit facility, amount outstanding Long-Term Line of Credit Entity Address, State Entity Address, State or Province Level 1 Fair Value, Inputs, Level 1 [Member] Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Other adjustments, including business divestiture Contract With Customer, Liability, Other Adjustments Contract With Customer, Liability, Other Adjustments Accounts receivable Increase (Decrease) in Accounts and Other Receivables Award Type [Axis] Award Type [Axis] Denominator: Weighted Average Number of Shares Outstanding, Basic [Abstract] Net cash provided by (used in) operating activities Net Cash Provided by (Used in) 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Non-Current Litigation Settlement, Amount Awarded to Other Party, Non-Current Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Revolving credit facility Revolving Credit Facility [Member] Anticipated clean period Remedial Work Anticipated Clean Up Period Remedial Work Anticipated Clean Up Period Document Type Document Type Point in time Transferred at Point in Time [Member] Restricted Stock, Deferred Stock Units and Performance Share Units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Line of credit facility increase over previous commitment Line of Credit Facility, Increase (Decrease), Net Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Outstanding, Beginning balance (usd per share) 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corporate assets Corporate, Non-Segment [Member] Total L.B. Foster Company stockholders’ equity Stockholders' Equity Attributable to Parent Director Director [Member] Vesting [Domain] Vesting [Domain] Chemtec Energy Services LLC Chemtec Energy Services LLC [Member] Chemtec Energy Services LLC Line of Credit Facility Line of Credit Facility [Line Items] Entity Interactive Data Current Entity Interactive Data Current Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Change in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Numerator for basic and diluted loss per common share: Net Income (Loss) Attributable to Parent [Abstract] Retained Earnings Retained Earnings [Member] Segment Reporting Information Segment Reporting Information Segment Reporting Information [Line Items] Deferred Stock Units Deferred Stock Units [Member] Deferred Stock Units Common Stock Common Stock [Member] Treasury stock acquisitions Payments for Repurchase of Common Stock Statement [Table] Statement [Table] Repayments of debt Repayments of Other Long-Term Debt 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 Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Document Quarterly Report Document Quarterly Report Current assets: Assets, Current [Abstract] Long-term operating lease liabilities Operating Lease, Liability, Noncurrent Pension liability adjustment Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Expenses associated with contributions made Defined Contribution Plan, Cost Range [Axis] Statistical Measurement [Axis] Technology Services and Solutions Rail Technologies Products [Member] Rail Technologies Products Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Retained earnings Retained Earnings (Accumulated Deficit) Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Prior Credit Facility Prior Credit Facility [Member] Prior Credit Facility Equity Components [Axis] Equity Components [Axis] Investment of noncontrolling interest Proceeds from Noncontrolling Interests Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Document Fiscal Year Focus Document Fiscal Year Focus Foreign Plan Foreign Plan [Member] United Kingdom UNITED KINGDOM CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Statement Statement [Line Items] Proceeds from debt Proceeds from Issuance of Other Long-Term Debt Outstanding, Beginning balance (in shares) Outstanding, Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy and NAV [Axis] Gross Carrying Value Finite-Lived Intangible Assets, Gross Selling and administrative expenses Selling, General and Administrative Expense Sales of goods Product [Member] Operating lease right-of-use assets - 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Schedule of Inventory Schedule of Inventory, Current [Table Text Block] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Precast Concrete Products Precast Concrete Products [Member] Precast Concrete Products Allowance for Doubtful Accounts Accounts Receivable, Allowance for Credit Loss [Roll Forward] Common stock, par value $0.01, authorized 20,000,000 shares; shares issued at March 31, 2023 and December 31, 2022, 11,115,779; shares outstanding at March 31, 2023 and December 31, 2022, 10,809,711 and 10,776,827, respectively Common Stock, Value, Issued Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Annual commitment amount Long-term Purchase Commitment, Annual Commitment Amount Long-term Purchase Commitment, Annual Commitment Amount Granted (usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 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] Operating Segments Operating Segments [Member] Number of companies that received a general notice letter (company) Number Of Companies Receiving General Notice Letter Number Of Companies Receiving General Notice Letter 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 Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Net loss attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Commitments and Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Current liabilities: Liabilities, Current [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Deferred revenue Contract with Customer, Liability, Current Present value of remedial work Present Value of Proposed Remedial Work Present Value of Proposed Remedial Work Retirement Plan Type [Domain] Retirement Plan Type [Domain] Income Statement Location [Domain] Income Statement Location [Domain] Over time Transferred over Time [Member] Amendment Flag Amendment Flag Weighted Average Amortization Period In Years Finite-Lived Intangible Asset, Useful Life Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Total comprehensive loss Other Comprehensive Income (Loss), Net of Tax Comprehensive loss attributable to L.B. Foster Company Comprehensive Income (Loss), Net of Tax, Attributable to Parent Rail, Technologies, and Services Rail Technologies and Services Segment [Member] Rail Technologies and Services Segment Net additions to contract assets Contract With Customer Asset Additions Contract With Customer Asset Additions Entity Current Reporting Status Entity Current Reporting Status Fabricated Steel Products Fabricated Steel Products [Member] Fabricated Steel Products Goodwill and Intangible Assets Disclosure [Abstract] Other assets Other Assets, Noncurrent Accrued payroll and employee benefits Increase (Decrease) in Employee Related Liabilities Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Swap Swap [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Other noncurrent assets Increase (Decrease) in Other Noncurrent Assets Domestic Plan Domestic Plan [Member] Title of Individual [Domain] Title of Individual [Domain] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Other expense (income) - 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net (Note 6) Inventories - net Inventory, Net Over time sales, percentage Over Time Sales, Percent Over Time Sales, Percent Accounts payable Accounts Payable, Current Accrual for environmental loss Accrual for Environmental Loss Contingencies Entity Filer Category Entity Filer Category Denominator for basic loss per common share (in shares) Weighted Average Number of Shares Outstanding, Basic Rail Products and Global Friction Management Rail Products And Friction Management [Member] Rail Products And Friction Management United States UNITED STATES Long-term portion of accrued settlement (Note 13) Accrued Legal Settlement Non Current Accrued Legal Settlement Non Current Security Exchange Name Security Exchange Name Fair Value, Balance Sheet Grouping, Financial Statement Captions Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Schedule of Reconciliation of Revenue from Segments to Consolidated Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Cash flow hedges reclassified to earnings, net of tax expense of $0 and $66, respectively Cash flow hedges reclassified to earnings Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Restricted Stock Restricted Stock [Member] Share-Based Payment Arrangement, Noncash Expense [Abstract] Cover [Abstract] Level 3 Fair Value, Inputs, Level 3 [Member] Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Allowance for doubtful accounts, beginning balance Allowance for doubtful accounts, ending balance Accounts Receivable, Allowance for Credit Loss Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag Work-in-process Inventory, Work in Process, Net of Reserves Revenue Revenue from Contract with Customer [Text Block] Segment Reporting [Abstract] Contract assets Increase (Decrease) in Contract with Customer, Asset Line of credit facility, maximum increase in commitments Line Of Credit Facility, Maximum Increase In Commitments Line Of Credit Facility, Maximum Increase In Commitments Debt Instrument, Redemption, Period Two Debt Instrument, Redemption, Period Two [Member] Noncontrolling Interest Noncontrolling Interest [Member] Interest expense - 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