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Options, Grants in Period, Weighted Average Exercise Price Subsidiary or Equity Method Investee [Line Items] Subsidiary or Equity Method Investee [Line Items] Limited partnership unit to common stock conversion ratio Limited Partner Unit Conversion Ratio To Common Stock Limited Partner Unit Conversion Ratio To Common Stock Requirement of common stock outstanding to LILP common units owned Common Stock, Requirement Of Common Stock Outstanding To Limited Partner Units Owned Common Stock, Requirement Of Common Stock Outstanding To Limited Partner Units Owned Lincoln International LLC Lincoln International LLC [Member] Lincoln International LLC Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Class B Common Class B [Member] Schedule of Change in Allowance for Credit Losses Accounts Receivable, Allowance for Credit Loss [Table Text Block] Segments Segment Reporting, Policy [Policy Text Block] Schedule of Furniture, Equipment and Leasehold Improvements, Net Property, Plant, and Equipment [Table Text Block] Net Income (Loss) Per Share Attributable to Class A Common Stock Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Deferred Bonus and Profit Sharing Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Deferred Bonus and Profit Sharing Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Partners' equity Partners' Capital [Member] Partners' Capital Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Partner Type [Axis] Partner Type [Axis] Lincoln International, LP Lincoln International, LP [Member] Lincoln International, LP Geographical [Domain] Geographical [Domain] Purchases of property and equipment, net Payments to Acquire Property, Plant, and Equipment 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] Other non-cash activity Other Non-Cash Activity [Abstract] Other Non-Cash Activity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Unrecognized compensations expense for options Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Measurement period adjustment, total consideration transferred Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Business Combination, Recognized Asset Acquired and 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[Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Diluted (in shares) Weighted average shares of Class A common stock – Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Allowance for Credit Losses Allowance for Credit Losses [Text Block] Acquired backlog Order or Production Backlog [Member] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] LI GP, Inc. LI GP, Inc. [Member] LI GP, Inc. 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stock, shares authorized (in shares) Common Stock, Shares Authorized Net income per share attributable to holders of Class A common stock: Earnings Per Share Reconciliation [Abstract] Concentration of Credit Risk Concentration Risk Disclosure [Text Block] Number of shares issued in transaction (in shares) Sale of Stock, Number of Shares Issued in Transaction Summary of Restricted Stock Unit Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Exercise Price Award Exercise Price Cash Flows from Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Related Party Transaction [Axis] Related Party Transaction [Axis] Segment Reporting [Line Items] Segment Reporting [Line Items] Total consideration transferred: Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill, Less Noncontrolling Interest Document Quarterly Report Document Quarterly Report 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Combination [Table] Business Combination [Table] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Secured Debt Secured Debt [Member] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Received net proceeds Sale of Stock, Consideration Received on Transaction Adoption Date Trading Arrangement Adoption Date Counterparty Name [Domain] Counterparty Name [Domain] Total equity attributable to Lincoln International, Inc. 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Executive Officers, Footnote [Text Block] Retained earnings (accumulated deficit) Retained Earnings (Accumulated Deficit) Unvested at beginning of period (in shares) Unvested at end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares 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] Liquidity event, shares to be issued (in shares) Share-Based Payment Arrangement, Liquidity Event, Shares To Be Issued Share-Based Payment Arrangement, Liquidity Event, Shares To Be Issued Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Contingent consideration, liability Business Combination, Contingent Consideration, Liability Fair Value Measurement [Domain] Fair 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[Abstract] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares 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] Lease liability and other liabilities Business Combination, Recognized Liability Assumed, Lease Liability And Other Liabilities Business Combination, Recognized Liability Assumed, Lease Liability And Other Liabilities Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Tax receivable agreement, payment of tax benefits, percent Tax Receivable Agreement, Payment Of Tax Benefits, Percent Tax Receivable Agreement, Payment Of Tax Benefits, Percent Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Sale of stock, price (in USD per share) Sale of Stock, Price Per Share Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Adjustment to Compensation: Adjustment to Compensation [Axis] 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] 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 Name Measure Name Income Taxes Tax Receivable Agreement Income Tax Disclosure [Text Block] Initial establishment of deferred tax asset Non-Cash Or 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Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Subsidiary or Equity Method Investee, Sale of Stock [Table] Subsidiary or Equity Method Investee, Sale of Stock [Table] Revision of Prior Period [Axis] Revision of Prior Period [Axis] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent General Partner General Partner [Member] Rental expense Operating Lease, Expense Company Selected Measure Amount Company Selected Measure Amount Reclass from income taxes receivables Income Taxes Receivable Depreciation and amortization expense Depreciation and amortization Depreciation, Depletion and Amortization Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Stock, Class of Stock [Table] Stock, Class of Stock [Table] Net income (loss) Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Distributions to partners Payments of Distributions to Affiliates Weighted average remaining lease term (years) 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 from entering new leases and remeasurements Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 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 Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Provision for income taxes Income Tax Expense (Benefit) Reductions of lease liability due to termination Operating Lease, Reduction Of Lease Liability Due To Termination Operating Lease, Reduction in Lease Liability Risks and Uncertainties [Abstract] Net income impact due to: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Reorganization Of Equity Structure Reorganization Of Equity Structure Reorganization Of Equity Structure Award Timing Method Award Timing Method [Text Block] Consolidation Consolidation, Policy [Policy Text Block] Net decrease 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 Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Deferred tax liability Business Combination, Recognized Liability Assumed, Deferred Tax Liability Net income (loss) attributable to Lincoln International Inc. Net income (loss) attributable to Lincoln International Inc. 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] IPO proceeds less underwriter discount Proceeds from Issuance Initial Public Offering Restatement Determination Date: Restatement Determination Date [Axis] Liabilities assumed: Business Combination, Recognized Liability Assumed, Liability [Abstract] Leases Lessee, Leases [Policy Text Block] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Measurement period adjustments, property and equipment, net Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment Income tax payable Accrued Income Taxes Revenues: Revenues [Abstract] Nature of Operations and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Numerator: ($ in thousands) Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]