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[Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Anti-dilutive securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount RSUs RSUs expense Restricted Stock Units (RSUs) [Member] Schedule of Changes in the Carrying Amount of Goodwill Goodwill [Table Text Block] Central Index Key Entity Central Index Key Weighted Average Weighted Average [Member] Less: Accumulated depreciation Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Schedule of Capitalized Computer Software Schedule Of Capitalized Computer Software [Table Text Block] Schedule Of Capitalized Computer Software All Adjustments to Compensation All Adjustments to Compensation [Member] Business Combination [Axis] Business Combination [Axis] Equity: Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or 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Development Expense Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Total identifiable assets acquired excluding goodwill Business Combination, Recognized Asset Acquired, Asset Deferred compensation plan liabilities Deferred compensation plan liabilities Deferred Compensation Liability, Classified, Noncurrent Long-Term Purchase Commitment [Line Items] Long-Term Purchase Commitment [Line Items] Business Combination, Separately Recognized Transaction [Line Items] Business Combination, Separately Recognized Transaction [Line Items] Share-Based Payment Arrangement [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Total revenues Total revenues Revenue from Contract with Customer, Excluding Assessed Tax Property and equipment, net Total property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Schedule of Investments Investment [Table Text Block] AOI less Operating SBC Adjusted Operating Income Less Operating Stock-Based Compensation Adjusted Operating Income Less Operating Stock-Based Compensation Headcount‑related costs Headcount-Related Costs Headcount-Related Costs Purchase commitment Long Term Purchase Commitment, Remaining Amount Committed Long Term Purchase Commitment, Remaining Amount Committed Termination period (less than) Lessee, Operating Lease, Termination Period Lessee, Operating Lease, Termination Period Interest rate swap Derivative Asset Repurchase of class B common stock under approved program Stock Repurchased During Period, Value Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Goodwill and Other Intangible Assets Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Accordion feature, increase limit Line of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Term Licenses Term Licenses [Member] Term Licenses DCP participant deferrals Deferred Compensation Arrangement with Individual, Distribution Paid Operating lease, weighted average discount rate, percent Operating Lease, Weighted Average Discount Rate, Percent Cost of subscriptions and licenses Cost, Amortization Operating lease liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Noncurrent Liabilities, Operating Lease, Liability, Noncurrent Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Noncurrent Liabilities, 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Overnight Bank Funding Effective Rate Services Services Service [Member] Remaining performance obligation amount Revenue, Remaining Performance Obligation, Amount Asia-Pacific (“APAC”) APAC Asia Pacific [Member] Current Fiscal Year End Date Current Fiscal Year End Date Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain] Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Acquisitions Business Combination [Text Block] Total long-lived assets Long-Lived Asset, Excluding Financial Instrument, Customer Relationship, Mortgage Servicing Right, Deferred Policy Acquisition Cost, and Deferred Tax Asset, Amount Repurchase of class B common stock under approved program (in shares) Stock Repurchased During Period, Shares Segment reporting other segment item amount, net income measure Segment Reporting, Other Segment Item, Amount, Net Income Measure Segment Reporting, Other Segment Item, Amount, Net Income Measure Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Dividend per share (in USD per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Fully vested shares granted Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Research and development costs capitalized, amortization Capitalized Cost, Software to be Sold, Leased, or Marketed, Amortization Expense Shares purchased (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Purchased for Award Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Accounts receivable and other current assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Receivables And Other Current Assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Receivables And Other Current Assets Common stock shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] Term Loan Term Loan [Member] Term Loan Time-Based Restricted Stock Units (RSUs) Time-Based Restricted Stock Units (RSUs) [Member] Time-Based Restricted Stock Units (RSUs) Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Equity Components [Axis] Equity Components [Axis] Deferred Bonus Deferred Bonus [Member] Accounts receivable Increase (Decrease) in Accounts Receivable Recurring Professional Services, Recurring [Member] Professional Services, Recurring Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Deferred compensation plan Bonus plan compensation expense Deferred compensation plan Deferred Compensation Arrangement with Individual, Compensation Expense Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Class A Common Stock Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Variable Rate [Axis] Variable Rate [Axis] Less: Net income (loss) attributable to noncontrolling interest Less: Net income (loss) attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Total DCP liabilities Deferred Compensation Liability, Current and Noncurrent Deferred income taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Payments for shares acquired including shares withheld for taxes Payments For Repurchase Of Common Stock, Including Shares Withheld For Taxes Payments For Repurchase Of Common Stock, Including Shares Withheld For Taxes Entity Small Business Entity Small Business Comprehensive income attributable to Bentley Systems Comprehensive Income (Loss), Net of Tax, Attributable to Parent Unamortized debt issuance costs Debt Instrument, Unamortized Discount Termination Date Trading Arrangement Termination Date Shares withheld for tax withholding obligation (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Acquired finite-lived intangible assets, weighted average useful life Intangible Asset, Finite-Lived, Acquired, Weighted-Average Amortization Period Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Finite-lived intangibles Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Shares related to restricted stock, net Restricted Stock, Value, Shares Issued Net of Tax Withholdings Actuarial (loss) gain on retirement plan, net of tax effect of $2, $(8), $503, and $(16), respectively Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other assets Other Assets, Noncurrent Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Accruals and other current liabilities Total accruals and other current liabilities Accruals and other current liabilities Accrued Liabilities, Current Fair Value as of Grant Date Award Grant Date Fair Value Repayments of convertible senior notes Repayments of Convertible Debt Performance Based Restricted Stock Units (RSUs) Performance Based Restricted Stock Units (RSUs) [Member] Performance Based Restricted Stock Units (RSUs) [Member] Time-Based Restricted Stock Units (RSUs) Time-Based Restricted Stock And Restricted Stock Units (RSUs) [Member] Time-Based Restricted Stock And Restricted Stock Units (RSUs) Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Deferred revenues Business Combination, Recognized Liability Assumed, Deferred Revenue, Current Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Deferred revenues Contract with Customer, Liability, Noncurrent Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (Note 18) Commitments and Contingencies Gross Carrying Amount Intangible Asset, Finite-Lived, before Accumulated Amortization Property and equipment, at cost Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Computer equipment and software Computer Equipment And Software [Member] Computer Equipment And Software Equity in net income of investees, net of tax Income (Loss) from Equity Method Investments Accounts payable, accruals, and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Subscriptions and licenses Subscriptions and licenses Subscriptions And Licenses [Member] Subscriptions And Licenses Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Deferred income taxes Business Combination, Recognized Asset Acquired, Deferred Tax Asset Executive Category: Executive Category [Axis] Long-Term Purchase Commitment [Table] Long-Term Purchase Commitment [Table] Tax benefit (expense) Other Comprehensive Income (Loss), Tax Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Goodwill [Roll Forward] Goodwill [Roll Forward] Furniture, fixtures, and equipment Furniture and Fixtures [Member] Liabilities and Equity Liabilities and Equity [Abstract] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] 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] Award Type [Domain] 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] Shares reserved for issuance (in shares) Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance Hosted Software Solutions and Internal Use Software Costs Hosted Software Solutions And Internal Use Software Costs [Member] Hosted Software Solutions And Internal Use Software Costs Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Business Combination, Separately Recognized Transaction [Table] Business Combination, Separately Recognized Transaction [Table] PEO Name PEO Name Geographical [Axis] Geographical [Axis] Portfolio Balancing Portfolio Balancing Exchange Rights [Member] Portfolio Balancing Exchange Rights Contract with customer, liability Contract with Customer, Liability Billing Status, Type [Axis] Billing Status, Type [Axis] Cash paid for income taxes Income Tax Paid, before Refund Received Bonus Plan Incentive Bonus Plan Incentive [Member] Bonus Plan Incentive Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Cash-settled equity awards Accrued Equity Based Compensation, Fair Value Disclosure Accrued Equity Based Compensation, Fair Value Disclosure Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Contractual interest expense Interest Expense, Debt Assets acquired and liabilities assumed: Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract] Shares related to restricted stock, net (in shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Other accrued and current liabilities 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] Daily Simple SOFR Rate Spread Daily Simple SOFR Rate Spread [Member] Daily Simple SOFR Rate Spread 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] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Cash paid at closing Payments to Acquire Businesses, Gross Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Total operating lease cost Lease, Cost ESPP Employee Stock [Member] Customer [Domain] Customer [Domain] Leases Lessee, Operating Leases [Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in USD per share) Earnings Per Share, Basic Convertible senior notes due January 2026 (the “2026 Notes”) Senior Notes Due January 2026 [Member] Senior Notes Due January 2026 Actuarial (Loss) Gain on Retirement Plan Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Noncontrolling Interest [Member] Repurchases of Class B common stock under approved program Payments for Repurchase of Common Stock Deferred revenues Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Long-term debt Total long-term debt Long-Term Debt, Excluding Current Maturities Cash-Settled Restricted Stock Units (RSUs) Cash-Settled Restricted Stock Units (RSUs) [Member] Cash-Settled Restricted Stock Units (RSUs) Total cost of revenues Cost of Revenue Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accumulated deficit Retained Earnings (Accumulated Deficit) Other Postretirement Benefits, Individual Contracts, Type of Deferred Compensation [Axis] Other Postretirement Benefits, Individual Contracts, Type of Deferred Compensation [Axis] Maturity extension threshold period Line Of Credit Facility, Maturity Extension Threshold Period Line Of Credit Facility, Maturity Extension Threshold Period Product and Service [Axis] 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] Proceeds from term loan Proceeds from Issuance of Secured Debt Common Stock Common Stock [Member] Operating lease cost Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Shares issued (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Basis of Presentation and Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Cover [Abstract] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Schedule of Deferred Compensation Plan Liabilities Deferred Compensation Arrangement with Individual Disclosure, Postretirement Benefits [Table Text Block] Concentration risk percentage Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Foreign currency translation adjustments Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Number of acquisitions Business Combination, Number of Businesses Acquired Total liabilities and equity Liabilities and Equity Variable lease cost Variable Lease, Cost Accrued compensation Accrued Salaries, Current Deferred compensation plan, current Deferred Compensation Liability, Fair Value Disclosure, Current Deferred Compensation Liability, Fair Value Disclosure, Current Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Noncontrolling interest Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Additional paid-in capital Additional Paid in Capital Intangible assets subject to amortization: Intangible Asset, Finite-Lived, after Accumulated Amortization [Abstract] Schedule of Stock-Based Compensation Expense Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Other income (expense), net Total other income (expense), net Other Nonoperating Income (Expense) Long-Term Debt Long-Term Debt [Text Block] Repayments of senior debt Repayments of Senior Debt Total Bentley Systems Stockholders' Equity Parent [Member] Schedule of Accruals and Other Current Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Dilutive effect of assumed conversion of convertible senior notes (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Name Awards Close in Time to MNPI Disclosures, Individual Name Deferred compensation plan Increase (Decrease) in Deferred Compensation 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] General and administrative General and Administrative Expense Aircraft Air Transportation Equipment [Member] Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Preferred stock shares authorized (in shares) Preferred Stock, Shares Authorized Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Preferred stock, $0.01 par value, authorized 100,000,000 shares; none issued or outstanding as of June 30, 2026 and December 31, 2025 Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Shares issued in connection with deferred compensation plan, net (in shares) Stock Issued During Period, Shares, Deferred Compensation Plan Stock Issued During Period, Shares, Deferred Compensation Plan Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Prepaid income taxes Prepaid Taxes Extinguishment of debt Extinguishment of Debt, Amount Foreign Currency Translation Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] Less: Net income attributable to Bentley Systems allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] Deferred Compensation Arrangement with Individual, Excluding Share-Based Payments and Postretirement Benefits [Line Items] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets Assets, Fair Value Disclosure Common stock, reserved for future issuance amount Common Stock, Capital Shares Reserved For Future Issuance Amount Common Stock, Capital Shares Reserved For Future Issuance 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 [Domain] Fair Value Hierarchy and NAV [Domain] Other Other Noncash Income (Expense) Channel Partners Channel Partners [Member] Channel Partners Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Other Professional Services, Other [Member] Professional Services, Other Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Supplemental information: Supplemental Cash Flow Elements [Abstract] Defined Contribution Plan [Table] Defined Contribution Plan [Table] Name Trading Arrangement, Individual Name Unrecognized compensation cost, excluding options Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Cash and cash equivalents Cash and Cash Equivalent Shares issued for stock grants, net (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures Compensation Related Costs [Abstract] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Equity Method Investments and Joint Ventures [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Other income (expense), net Other Miscellaneous Nonoperating Income (Expense), Other Other Miscellaneous Nonoperating Income (Expense) Fully vested shares granted (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Net income Net income Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Enterprise subscriptions Enterprise License Subscriptions [Member] Enterprise License Subscriptions Current assets: Assets, Current [Abstract] Operating lease, weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Vested (in 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 Deferred compensation arrangement with individual, shares issued (in shares) Deferred Compensation Arrangement with Individual, Shares Issued Depreciation expense Depreciation, Nonproduction Provision for income taxes Provision for income taxes Income Tax Expense (Benefit) Foreign currency remeasurement loss Gain (Loss), Foreign Currency Transaction, before Tax Customer Concentration Risk Customer Concentration Risk [Member] Award Timing Method Award Timing Method [Text Block] Consolidation Consolidation, Policy [Policy Text Block] Increase in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forecast Forecast [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net income per share attributable to Bentley Systems stockholders: Net Income (Loss) Attributable to Parent [Abstract] Deferred income taxes Business Combination, Recognized Liability Assumed, Deferred Tax Liability Recent Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Tranche Three Share-Based Payment Arrangement, Tranche Three [Member] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Net income attributable to Bentley Systems Net income attributable to Bentley Systems Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Debt issuance costs related to term loan Unamortized Debt Issuance Expense Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Statement [Table] Statement [Table] Tranche Two Share-Based Payment Arrangement, Tranche Two [Member] Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Interest income Investment Income, Interest Deferred compensation plan liabilities Deferred Compensation Liability, Fair Value Disclosure Deferred Compensation Liability, Fair Value Disclosure Americas United States, Canada, And Latin America [Member] United States, Canada, And Latin America Foreign exchange Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Revenues: Revenues [Abstract] Category of Item Purchased [Axis] Category of Item Purchased [Axis] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Nonqualified Plan [Member]