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Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Income before income taxes Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (Note 13) Commitments and Contingencies Revenues Revenues Gross Carrying Amount Intangible Asset, Finite-Lived, before Accumulated Amortization Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2030 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Receivable Type Receivable Type [Axis] Goodwill [Roll Forward] Goodwill [Roll Forward] Liabilities and Stockholders' Equity Liabilities and Equity [Abstract] Australia AUSTRALIA 2021 term loan 2021 Term Loan [Member] 2021 Term Loan [Member] Finite-Lived Intangible Assets, Major Class Name Intangible Asset, Finite-Lived, Class [Domain] Tax receivable agreement liability, net of current portion Tax Receivable Agreement Liability Net of Current Portion Tax receivable agreement liability, net of current portion. Inventory Inventory, Net All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] 2027 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One PEO Name PEO Name Geographical Geographical [Axis] Contract with customer, liability Contract with Customer, Liability Other reconciling items Segment Reporting, Other Segment Item, Amount Concentration of credit risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Interest expense including amortization of deferred financing costs and discounts Interest Expense, Debt Term loan Term Loan1 [Member] Term Loan1 [Member] Cash, cash equivalents and restricted cash - beginning of period Cash, cash equivalents and restricted cash - end of period Total cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Schedule Of Finite Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Other Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] 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] Debt Instrument Debt Instrument [Axis] Unbilled revenue Unbilled Revenue Unbilled Revenue Stock-based compensation Share-Based Payment Arrangement, Noncash Expense 2028 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Allowance for credit losses Credit Loss, Financial Instrument [Policy Text Block] Amended term loan Amended term loan Amended Term Loan [Member] Amended Term Loan [Member] Customer Customer [Domain] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Earnings per share, basic (in usd per share) Earnings Per Share, Basic Tax receivable agreement liability, current portion Tax Receivable Agreement Liability Current Portion Tax receivable agreement liability, current portion. Share repurchases and retirement Payment for share repurchase Payments for Repurchase of Common Stock Total current assets Assets, Current Statistical Measurement Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Debt, net of current portion Total debt, net of current portion Long-Term Debt, Excluding Current Maturities Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable (net of allowance for credit losses of $20.7 million and $23.0 million at September 30, 2026 and December 31, 2025, respectively) Accounts Receivable, after Allowance for Credit Loss, Current Accumulated deficit Retained Earnings (Accumulated Deficit) Product and Service Product and Service [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Outstanding borrowings Loans Payable, Noncurrent Common Stock Common Stock [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Amended revolver Amended Revolver [Member] Amended Revolver [Member] ≤ 3.70:1.00 and > 3.20:1.00 Less Than Or Equal To Three Point Seven Zero And Greater Than Three Point Two Zero [Member] Less than or equal to three point seven zero and greater than three point two zero. United Kingdom UNITED KINGDOM Concentration risk percentage Concentration Risk, Percentage Concentration Risk Benchmark Concentration Risk Benchmark [Axis] Foreign currency translation adjustment Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] Uncertain tax position reserve release UTP reserve release UTP reserve release Bank guarantees required to support bids and contracts Bank guarantees required to support bids and contracts Bank guarantees required to support bids and contracts. Total liabilities and stockholders' equity Liabilities and Equity Installation and service parts, net Installation And Service Parts Net Installation and service parts, net. Accrued salaries and wages Accrued Salaries, Current Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt, before Debt Issuance Cost Writeoff Non-qualified stock options Share-Based Payment Arrangement, Option [Member] Summary of Change in Fair Value of Equity Securities Summary of Change in Fair Value of Equity Securities [Table Text Block] Summary of Change in Fair Value of Equity Securities Segments Segments [Axis] Other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Schedule of Prepaid Expenses and Other Current Assets Schedule Of Prepaid Expenses And Other Current Assets [Table Text Block] Schedule of prepaid expenses and other current assets. Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Schedule of Components of Stock Based Compensation Expense Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Other (income) expense, net Other Nonoperating Income (Expense) Debt, Net Long-Term Debt [Text Block] 2029 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Loan amount outstanding Loans Payable, Current Remainder of 2026 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Name Awards Close in Time to MNPI Disclosures, Individual Name 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] Share-based proceeds from legal settlement Share-based Proceeds from Legal Settlement Share-based Proceeds from Legal Settlement Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Commercial Services Commercial Services Commercial Services Segment [Member] Commercial services segment. Preferred stock, $0.0001 par value, 1,000 shares authorized with no shares issued and outstanding at September 30, 2026 and December 31, 2025 Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Commercial services customer B Commercial Services Customer B [Member] Commercial Services Customer B [Member] Class of Stock Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Common stock equivalents Incremental Common Shares Attributable To Conversion Of Common Stock Equivalents Incremental common shares attributable to conversion of common stock equivalents. Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Other Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Short term investments Beginning balance Ending balance Short-Term Investments Goodwill impairment Goodwill impairment Goodwill, Impairment Loss Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Prepaid Expense and Other Assets, Current [Abstract] Prepaid Expense and Other Assets, Current [Abstract] Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Patent Patent [Member] Patent [Member] Income taxes receivable Income Taxes Receivable Depreciation and amortization Depreciation, Depletion and Amortization Debt instrument, payment terms Debt Instrument, Payment Terms Entity Address, Address Line Two Entity Address, Address Line Two Schedule Of Accounts Notes Loans And Financing Receivable [Table] Accounts and Financing Receivables [Table] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Senior notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Unrealized loss on remeasurement of share-based proceeds Unrealized Loss on Remeasurement of Share-based Proceeds Unrealized Loss on Remeasurement of Share-based Proceeds Income tax provision Income Tax Expense (Benefit) Additional delivery common shares Additional Delivery Common Shares Additional delivery common shares at the time of final settlement. City of new york department of transportation City Of New York Department Of Transportation [Member] The City of New York Department of Transportation. Customer concentration risk Customer Concentration Risk [Member] Cost of product sales Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Equity securities acquired from legal settlement Equity Securities Acquired From Legal Settlement Equity Securities Acquired From Legal Settlement Principles of consolidation Consolidation, Policy [Policy Text Block] Net increase in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Equipment financing arrangements Equipment Financing Arrangements Equipment Financing Arrangements Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net income Net income [(loss)] Net income (loss) attributable to parent Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Commercial services customer A Commercial Services Customer A [Member] Commercial Services Customer A [Member] Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from the exercise of stock options Proceeds from Stock Options Exercised Thereafter Finite Lived Intangible Assets Amortization Expense After Year Four Finite-lived intangible assets, amortization expense, after year four. Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Initial delivery common shares Initial delivery common shares Initial delivery common shares Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]