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Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] PNC PNC [Member] PNC Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Hazardous waste processing solutions Waste Processing and Reuse Solutions [Member] Waste Processing and Reuse Solutions [Domain] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Reserve for forward losses on contracts Provision for Loss on Contracts Local Phone Number Local Phone Number Schedule of Loss Contingencies by Contingency Schedule of Loss Contingencies by Contingency [Table Text Block] Debt obligation Debt, Long-Term and Short-Term, Combined Amount Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Deferred tax liabilities Deferred Income Tax Liabilities, Net Interest Expense Interest Expense [Member] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Changes in assets and liabilities, net of acquisitions and dispositions of businesses: Increase (Decrease) in Operating Capital [Abstract] Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] PEO Total Compensation Amount PEO Total Compensation Amount Liability derivatives Derivative Liability, Subject to Master Netting Arrangement, before Offset Pension liability adjustments, net of deferred income taxes Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Number Of Potentially Related Parties Number Of Potentially Related Parties Number Of Potentially Related Parties Harsco Industrial IKG Harsco Industrial IKG [Member] Harsco Industrial IKG [Member] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Statement of Income Location, Balance [Axis] Derivative Instruments, Gain (Loss) by Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Accounts Receivable Under Factoring Arrangement Accounts Receivable Under Factoring Arrangement [Member] Accounts Receivable Under Factoring Arrangement Debt Covenant Ratio, Period Four Debt Covenant Ratio, Period Four [Member] Debt Covenant Ratio, Period Four Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Loss Contingencies, Unpaid Service Taxes Loss Contingencies, Unpaid Service Taxes Loss Contingencies, Unpaid Service Taxes Common Stock Issued Common Stock [Member] Measure: Measure [Axis] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Line of Credit Line of Credit [Member] Accounts Receivable Aging [Axis] Accounts Receivable Aging [Axis] Accounts Receivable Aging [Axis] Entity Emerging Growth Company Entity Emerging Growth Company Segment Reporting [Abstract] Segment Reporting [Abstract] Entity Central Index Key Entity Central Index Key Loss contingency, damages sought, value Loss Contingency, Damages Sought, Value Scenario [Axis] Scenario [Axis] Schedule of inventories Schedule of Inventory, Current [Table Text Block] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Cumulative Foreign Exchange Translation Adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Discontinued Operations and Disposal Groups [Abstract] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Debt Covenant Ratio, Period Two Debt Covenant Ratio, Period Two [Member] Debt Covenant Ratio, Period Two Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Equity Component [Domain] Equity Component [Domain] Review of Operations by Segment Segment Reporting Disclosure [Text Block] Current maturities of long-term debt Current maturities of long-term debt Long-Term Debt, Current Maturities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Amounts reclassified from AOCI, net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Recently Adopted and Recently Issued Accounting Standards Accounting Standards Update and Change in Accounting Principle [Text Block] Amortization of unearned portion of stock-based compensation, net of forfeitures APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Entity Shell Company Entity Shell Company Measurement Basis [Axis] Measurement Basis [Axis] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Title Trading Arrangement, Individual Title Defined benefit pension income (expense) Pension Expense (Reversal of Expense), Noncash Statement [Table] Statement [Table] Counterparty Name [Axis] Counterparty Name [Axis] Unrecognized tax benefits Unrecognized Tax Benefits Less: Comprehensive (income) loss attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Consolidation Items [Domain] Consolidation Items [Domain] City Area Code City Area Code Income tax benefit (expense) from discontinued businesses Discontinued Operation, Tax Effect of Discontinued Operation Current liabilities: Liabilities, Current [Abstract] Product revenues Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax AR facility term Accounts Receivable Securitization, Term Accounts Receivable Securitization, Term Disposal Group Classification [Domain] Disposal Group Classification [Domain] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Capital Expenditures Payments to Acquire Productive Assets Derivative Instruments, Hedging Activities and Fair Value Derivative Instruments Hedging Activities and Fair Value Disclosure [Text Block] Disclosure of the entity's derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising there from, and the amounts of and methodologies and assumptions used in determining the amounts of such items. Also represents the disclosure regarding the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Total current assets Assets, Current Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Senior Notes Senior Notes [Member] Ecoproducts Applied Products [Member] Applied Products [Domain] Revision of Prior Period [Domain] Revision of Prior Period [Domain] Term Loan Facility, Fixed-Rate Term Loan Facility, Fixed-Rate [Member] Term Loan Facility, Fixed-Rate [Member] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Defined benefit pension plan Defined Benefit Plan, Plan Assets, Contributions by Employer Extended Revolving Credit Facility Extended Revolving Credit Facility [Member] Extended Revolving Credit Facility Long-term debt Long-Term Debt, Excluding Current Maturities Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Income Taxes Income Tax Disclosure [Text Block] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Equity [Abstract] Equity [Abstract] Retained earnings Retained Earnings (Accumulated Deficit) Reclassification out of accumulated other comprehensive income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Proceeds from notes receivable Proceeds from Sale of Notes Receivable Accounts receivable from securitization Accounts Receivable from Securitization Domestic Plan [Member] Domestic Plan [Member] Inventories Increase (Decrease) in Inventories Financing costs Debt Issuance Costs, Gross Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Short-term borrowings, net Proceeds from (Repayments of) Short-Term Debt Net cash (used) provided by financing activities Net Cash Provided by (Used in) Financing Activities Underlying Securities Award Underlying Securities Amount Performance share units Performance Shares [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Harsco Rail Segment Harsco Rail [Member] Represents information pertaining to the Harsco Rail segment. Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Stock appreciation rights exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Exercised Credit Facility [Axis] Credit Facility [Axis] Amendment Flag Amendment Flag Long-term debt, fair value Long-Term Debt, Fair Value Reported Value Measurement Reported Value Measurement [Member] Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Term Loan Facility Term Loan Term Loan [Member] Term Loan [Member] Accounts Receivable Aging [Domain] Accounts Receivable Aging [Domain] [Domain] for Accounts Receivable Aging [Axis] Entity Registrant Name Entity Registrant Name Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Stock appreciation rights Stock Appreciation Rights (SARs) [Member] Remeasurement of long-lived assets Other Asset Impairment Charges Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Machinery and equipment Machinery and Equipment [Member] Revenues from continuing operations: Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Fair Value as of Grant Date Award Grant Date Fair Value Depreciation expense Finance Lease, Right-of-Use Asset, Amortization Subsequent Events [Abstract] Subsequent Events [Abstract] Note receivable, face value Receivable with Imputed Interest, Face Amount Retirement plan assets Assets for Plan Benefits, Defined Benefit Plan Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Debt and Credit Agreements Debt Disclosure [Text Block] HARSCO CORPORATION STOCKHOLDERS' EQUITY Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Geographical [Domain] Geographical [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Principal amount Debt Instrument, Face Amount Summary of revenues by primary geographical markets Disaggregation of Revenue [Table Text Block] Soil and dredged materials processing and reuse solutions Soil and Dredged Materials Processing and Reuse Solutions [Member] Soil and Dredged Materials Processing and Reuse Solutions Entity Address, Postal Zip Code Entity Address, Postal Zip Code Interest rate swaps Interest Rate Swap [Member] Dividends paid to noncontrolling interests Payments of Ordinary Dividends, Noncontrolling Interest Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Common stock Common Stock, Value, Issued Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Penalties Penalties Penalties Borrowings and repayments under Revolving Credit Facility, net Proceeds from Issuance of Long-Term Debt, Net of Issuance Costs Proceeds from Issuance of Long-Term Debt, Net of Issuance Costs Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Current Portion of Environmental Liabilities Current Portion of Environmental Liabilities Current Portion of Environmental Liabilities Derivative liabilities Other Current Liabilities [Member] Impairment of intangibles Impairment of Intangible Assets (Excluding Goodwill) Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Schedule of other (income) expenses Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Basic earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share) Earnings Per Share, Basic Accounts payable Increase (Decrease) in Accounts Payable Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Note receivable, interest rate Note Receivable; Interest Rate; Stated percentage Note Receivable; Interest Rate; Stated percentage Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Amortization Amortization Fair Value of Derivatives Designated as Hedging Instruments Designated as Hedging Instrument [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Number of claims dismissed to date by stipulation or summary judgment prior to trial Loss Contingency, Claims Dismissed, Number Total current liabilities Liabilities, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] CSN CSN [Member] CSN Total assets Assets Cost of services and products sold Cost of Goods and Services Sold Existing commitments Long-Term Line of Credit Contributions from noncontrolling interests Noncontrolling Interest, Increase from Subsidiary Equity Issuance Total net debt to consolidated adjusted EBITDA ratio Net Debt to Consolidated Adjusted EBITDA Ratio Net Debt to Consolidated Adjusted EBITDA Ratio Unused Debt Commitment And Amendment Fees Unused Debt Commitment And Amendment Fees Unused Debt Commitment And Amendment Fees Purchases of property, plant and equipment Payments to Acquire Property, Plant, and Equipment Other liabilities Other Liabilities, Noncurrent Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Statutory Accounting Practice, Jurisdiction [Domain] Statutory Accounting Practice, Jurisdiction [Domain] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Termination Date Trading Arrangement Termination Date Fair Value of Derivatives Not Designated as Hedging Instruments Not Designated as Hedging Instrument [Member] Accounts receivable securitization, maximum purchase commitment Accounts Receivable Securitization, Maximum Purchase Commitment Accounts Receivable Securitization, Maximum Purchase Commitment Entity Address, City or Town Entity Address, City or Town Debt Instrument [Axis] Debt Instrument [Axis] Net income (loss) attributable to Enviri Corporation Net Income (Loss) Net Income (Loss) Attributable to Parent Other expense (income), net Other expense (income), net Other Operating Income (Expense), Net Trading Arrangement: Trading Arrangement [Axis] Loss Contingency, Fine Issued By Court Loss Contingency, Fine Issued By Court Loss Contingency, Fine Issued By Court Components of Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Accrued compensation Increase (Decrease) in Other Employee-Related Liabilities Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Accounts receivable past due by twelve months or more Accounts Receivable Greater than 12 Months Reserved Accounts Receivable Greater than 12 Months Reserved Foreign Tax Jurisdiction Foreign Tax Jurisdiction [Member] Debt Instrument, Covnenat, Decrease in Adjusted EBITDA Debt Instrument, Covnenat, Decrease in Adjusted EBITDA Debt Instrument, Covenant, Decrease in Adjusted EBITDA Entity File Number Entity File Number Liquidity Liquidity [Policy Text Block] Liquidity Net gain (loss) on cash flow hedging instruments, net of deferred income taxes Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Revenue Recognition Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Facility fees and debt-related income (expense) Other Nonoperating Expense Noncontrolling Interests Noncontrolling Interest [Member] Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Effect of exchange rate changes on cash and cash equivalents, including restricted cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Employee termination benefit costs Severance Costs Unrecognized income tax benefit that will be recognized within the next twelve months Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Name Forgone Recovery, Individual Name Schedule of provision for doubtful accounts related to trade accounts receivable Schedule of Provision for Doubtful Accounts Receivables [Table Text Block] Tabular disclosure of the expense charged against operations, the offset to which is the allowance for doubtful accounts for the purpose of reducing trade accounts receivable to an amount that approximates their net realizable value. Document Period End Date Document Period End Date Loss Contingency Accrual, Provision Loss Contingency Accrual, Provision Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Contributions from noncontrolling interests Proceeds from Noncontrolling Interests Finished goods Inventory, Finished Goods, Net of Reserves Other, net Other Noncash Income (Expense) Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Base Rate Base Rate [Member] Insider Trading Arrangements [Line Items] Release of uncertain tax position for foreign jurisdiction Effective Income Tax Rate Reconciliation, Tax Contingency, Foreign, Amount Credit loss recovery, previous reserved customer balance Accounts Receivable, Credit Loss Expense (Reversal) Previously Reserved Accounts Receivable, Credit Loss Expense (Reversal) Previously Reserved Total contract assets Contract with Customer, Asset, after Allowance for Credit Loss Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Pre-tax net gains (losses) on certain loans designated as hedges of net investments in foreign subsidiaries Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax Discontinued operations: Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Other current assets Other Current Assets [Member] Advances on contracts and other customer advances Contract With Customer, Liability, Increase (Decrease) For Contracts Paid In Advance Contract With Customer, Liability, Increase (Decrease) For Contracts Paid In Advance PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Continuing operations (in dollars per share) Diluted (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Revenue recognized Contract with Customer, Liability, Revenue Recognized Adjustment to Compensation: Adjustment to Compensation [Axis] Less: Net loss (income) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Foreign exchange contracts Foreign Exchange Contract [Member] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Latin America Latin America [Member] Debt Covenant Ratio Period [Domain] Debt Covenant Ratio Period [Domain] Debt Covenant Ratio Period [Domain] Customer [Domain] Customer [Domain] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Current Reporting Status Entity Current Reporting Status Retained Earnings Retained Earnings [Member] Loss Contingency, Amount Seeking From Other Party Loss Contingency, Amount Seeking From Other Party Loss Contingency, Amount Seeking From Other Party Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Environmental liabilities Long-term environmental liabilities Accrual for Environmental Loss Contingencies, Gross Weighted-average shares of common stock outstanding (in shares) Weighted-average shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Unrealized gain (loss) on marketable securities, deferred income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Debt Instrument, Covenant, EBITDA Ratio, Quarterly Decrease Debt Instrument, Covenant, EBITDA Ratio, Quarterly Decrease Debt Instrument, Covenant, EBITDA Ratio, Quarterly Decrease Proceeds from sales of assets Proceeds from Sale of Productive Assets Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Restricted stock units Restricted Stock Units (RSUs) [Member] North America North America [Member] Increase (Decrease) in Stockholders' Equity Components of Accumulated Other Comprehensive Income [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Foreign currency translation adjustments, deferred income taxes OCI, Foreign Currency Transaction and Translation Gain (Loss), Arising During Period, Tax Executive Category: Executive Category [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name Uncompleted construction Construction in Progress [Member] Other costs (income) for exit activities Business Exit Costs, Excluding Severance The charge against earnings in the period, comprised of costs incurred associated with an exit or disposal activity other than for a discontinued operations as defined under generally accepted accounting principles. Costs of such activities include those for termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset. Debt Instrument, Floor Interest Rate Debt Instrument, Floor Interest Rate Debt Instrument, Floor Interest Rate Entity Filer Category Entity Filer Category Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Statement of Income Location, Balance [Domain] Income Statement and Other Comprehensive Income (Loss) Location [Domain] Statement of Income Location, Balance [Domain] Commitments and Contingencies Loss Contingencies [Line Items] Consolidated Adjusted EBITDA To Consolidated Interest Charges Ratio Consolidated Adjusted EBITDA To Consolidated Interest Charges Ratio Consolidated Adjusted EBITDA To Consolidated Interest Charges Ratio Company Selected Measure Name Company Selected Measure Name