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Finite-Lived Intangible Asset, Expected Amortization, Year One Expected amortization of intangible assets, 2027 Fair Value Disclosures [Abstract] Commitments and Contingencies Disclosure [Abstract] Share-based compensation arrangement by share-based payment award, Percentage of satisfied upon dividend-adjusted publicly traded shares Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Satisfied Upon Dividend Adjusted Publicly Traded Shares Share-based compensation arrangement by share-based payment award, Percentage of satisfied upon dividend-adjusted publicly traded shares. Lessee, Operating Lease, Liability, to be Paid, Year One 2027 Net Income (Loss) Available to Common Stockholders, Basic, Total Net Income Attributable to Shares of Class A Common Stock — Basic Net Income (Loss) Available to Common Stockholders, Basic Long-Term Line of Credit, Total Revolving credit facility, amount outstanding Long-Term Line of Credit Share-Based Payment Arrangement [Abstract] Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total Estimated unrecognized compensation expense related to unvested awards Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Revenues Revenues Revenues Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Net Cash Provided by (Used in) Investing Activities Title of 12(b) Security Title of 12(b) Security Schedule Of Segment Reporting Information By Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Revolving credit facility bear interest Line of Credit Facility, Interest Rate at Period End Amount due to tax receivable agreement Amount Due Pursuant to Tax Receivable Agreement Amount Due Pursuant To Tax Receivable Agreement The amount of liability recognized for the obligation to make payments under a tax receivable agreement, which typically arises in connection with an IPO or similar transaction where pre-IPO owners are entitled to a share of tax benefits realized by the company. Share repurchase program, remaining authorization amount Share Repurchase Program, Remaining Authorized, Amount Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Money Market Funds [Member] Money Market Funds Related Party Related and Nonrelated Parties [Domain] Income Taxes Income Tax Disclosure [Text Block] Accounts Receivable and Allowance for Credit Losses Allowance for Credit Losses [Text Block] Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year 2026 (April 1 through December 31) Legal Entity Legal Entity [Axis] Cash Flows Due to Changes in Operating Assets and Liabilities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Schedule of Furniture, Equipment and Leasehold Improvements, Net Property, Plant and Equipment [Table Text Block] Income Tax Disclosure [Abstract] Unrecognized Tax Benefits, Ending Balance Unrecognized Tax Benefits, Beginning Balance Unrecognized tax benefits Unrecognized Tax Benefits Additional Paid-in Capital Additional Paid-in Capital [Member] UNITED KINGDOM United Kingdom Share repurchase program, authorized amount Share Repurchase Program, Authorized, Amount Change in Accounting Principle, Accounting Standards Update, Adoption Date Trading Symbol Trading Symbol Schedule Of Finite Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Furniture, Equipment and Leasehold Improvements Property, Plant and Equipment Disclosure [Text Block] Schedule Of Related Party Transactions By Related Party [Table] Related Party Transaction [Table] Share based compensation arrangement by share based payment award percentage of awards satisfying market and service conditions. Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Awards Satisfying Market and Service Conditions Share based compensation arrangement by share based payment award, Percentage of awards satisfying market and service conditions Subsequent Event Type Subsequent Event Type [Axis] Schedule of Intangible Assets, Net Schedule of Finite-Lived Intangible Assets [Table Text Block] Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Commitment fee on unused portion of revolving credit facility Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Lessee, Operating Lease, Liability, to be Paid Total Lease Payments Lessee, Operating Lease, Liability, Undiscounted Excess Amount Less: Imputed Interest Cash Paid for Amounts Included in Measurement of Lease Liabilities Cash Paid For Amounts Included In Measurement Of Lease Liabilities [Abstract] Cash paid for amounts included in measurement of lease liabilities. Partnership Unit Awards Containing Service and Market Conditions Partnership Unit Awards With Performance Conditions [Member] Partnership unit awards with performance conditions. Equity Components Equity Components [Axis] Equity Component Equity Component [Domain] Asset Class Asset Class [Axis] Dividends Reinvested on RSUs Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Dividend Reinvested Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award equity instruments other than options dividend reinvested weighted average grant date fair value. Goodwill and Intangible Assets Disclosure [Abstract] Investments, Total Investments Investments (at fair value) Accounting Standards Update 2024-03 Prospective [Member] ASU 2024-03 Depreciation, Depletion and Amortization, Nonproduction, Total Depreciation and Amortization Depreciation, Depletion and Amortization, Nonproduction Statement of Comprehensive Income [Abstract] Rule 10b5-1 Arr Modified Flag Rule 10b5-1 Arr Modified Flag. Tax benefit accrual Tax Benefit Accrual Amount the company has agreed to pay Blackstone related to the net realized cash benefit from certain compensation related tax deductions. Maximum Maximum [Member] Dividends payable, date to be paid Dividends Payable, Date to be Paid Statistical Measurement Statistical Measurement [Axis] Total Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Accounts Payable, Accrued Expenses and Other Liabilities Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Common stock, value Common Stock, Value, Issued Net Income Attributable to Shares of Class A Common Stock — Diluted Net Income (Loss) Available to Common Stockholders, Diluted Schedule Of Financing Receivable Allowance For Credit Losses [Table] Financing Receivable, Allowance for Credit Loss [Table] Dividends Dividends [Axis] Total Equity Beginning Balance Ending Balance Equity, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest, Total Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income Attributable to Non-Controlling Interests Total Expenses Costs and Expenses Finite-Lived Intangible Assets by Major Class Finite-Lived Intangible Assets by Major Class [Axis] Employee Taxes Paid for Shares Withheld Payment, Tax Withholding, Share-Based Payment Arrangement Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Accounts Payable, Accrued Expenses and Other Liabilities Accounts Payable and Other Accrued Liabilities Related Party Transaction [Line Items] Related Party Transaction [Line Items] Revenue from Contract with Customer [Text Block] Revenues and Accounts Receivable Entity Registrant Name Entity Registrant Name Finite-Lived Intangible Asset, Expected Amortization, Year Two Expected amortization of intangible assets, 2028 Treasury Stock Purchases (in shares) Treasury stock repurchased Treasury Stock, Shares, Acquired Subsequent Events [Abstract] Finite-Lived Intangible Asset, Expected Amortization, Year Three Expected amortization of intangible assets, 2029 Income Tax Expense (Benefit) Provision (Benefit) for Taxes Expenses Costs and Expenses [Abstract] Participating Restricted Stock Units Participating Restricted Stock Units [Member] Participating restricted stock units. Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Non-controlling interest percentage Subsidiary, Ownership Percentage, Noncontrolling Owner Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss) Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Payments to Acquire Property, Plant, and Equipment, Total Purchases of Furniture, Equipment and Leasehold Improvements Payments to Acquire Property, Plant, and Equipment Granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Unrecognized compensation expense related to deferred cash awards Deferred Compensation Arrangement With Individual Unrecognized Compensation Expense Not Yet Recognized Deferred compensation arrangement with individual unrecognized compensation expense not yet recognized. Total Assets Assets Assets Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net [Abstract] Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Extended lease expiration period. Extended Lease Expiration Period Extended lease period Income Statement [Abstract] Vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Earnings Per Share, Diluted, Total Diluted Earnings Per Share, Diluted Summary of Company's Tax Position Tax Position Summary Table [Text Block] Tax position summary. Revenues from Contracts with Customers Disaggregation of Revenue [Abstract] City Area Code City Area Code Increase revolving credit facility Line of Credit Facility, Maximum Borrowing Capacity O 2026 Q1 Dividends O 2026 Q1 Dividends [Member] O 2026 Q1 dividends. Variable Lease Cost Variable Lease, Cost Weighted-Average Remaining Lease Term (in years) Operating Lease, Weighted Average Remaining Lease Term Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Total Lease Cost Lease, Cost Furniture, Equipment and Leasehold Improvements, Net Furniture, Equipment and Leasehold Improvements, Net Property, Plant and Equipment, Net Percentage payment to exchanging holders of partnership units of benefits Percentage Payment To Exchanging Holders Of Partnership Units Of Benefits Percentage payment to exchanging holders of partnership units of benefits. Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Cash and Cash Equivalents, Beginning of Period Cash and Cash Equivalents, End of Period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Schedule of Geographical Distribution of Revenues and Assets Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Retained Earnings Retained Earnings [Member] Share-Based Payment Arrangement, Noncash Expense, Total Equity-Based Compensation Expense Share-Based Payment Arrangement, Noncash Expense Weighted-Average Discount Rate Operating Lease, Weighted Average Discount Rate, Percent Level I Fair Value, Inputs, Level 1 [Member] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net Cash Provided by (Used in) Financing Activities Schedule of Components of Lease Expense Lease, Cost [Table Text Block] Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Investments, Fair Value Disclosure, Total Investments Investments, Fair Value Disclosure Non-US [Member] Other International Entity Interactive Data Current Entity Interactive Data Current Deferred Revenue Increase (Decrease) in Contract with Customer, Liability RSU Awards Containing Service and Market Conditions Restricted Stock Unit Awards With Performance Conditions [Member] Restricted stock unit awards with performance conditions. Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Furniture and Fixtures Furniture and Fixtures [Member] Segment Reporting, Expense Information Used by CODM, Type [Extensible Enumeration] Exchange of partnership units settled Partners' Capital Account, Units, Converted Dividends Declared Per Share of Class A Common Stock Common Stock, Dividends, Per Share, Declared Communications and Information Technology, Total Communications and Information Services Communications and Information Technology Share-Based Payment Arrangement, Expense, Tax Benefit Income Tax Benefit Entity Tax Identification Number Entity Tax Identification Number Revenues Revenues [Abstract] Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Occupancy and Related Occupancy, Net Local Phone Number Local Phone Number Weighted-Average Shares of Class A Common Stock Outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Accounting Policies [Abstract] Revenues from Contracts with Customers Revenue from Contract with Customer, Excluding Assessed Tax Revenues from Contracts with Customers Schedule Of Earnings Per Share Basic By Common Class [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Reclassification from other expenses to communications and information services Prior Period Reclassification Adjustment Lessee, Operating Lease, Liability, to be Paid, Year Four 2030 Class of Stock Class of Stock [Domain] Compensation and Benefits Labor and Related Expense Weighted-average period for recognition of compensation expense related to unvested awards Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Office Equipment Office Equipment [Member] Allowance for credit loss, long-term receivables Accounts Receivable, Allowance for Credit Loss, Noncurrent Entity Emerging Growth Company Entity Emerging Growth Company