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Equity-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended | 19 Months Ended | 31 Months Ended |
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Jun. 23, 2025 $ / shares shares | May 22, 2025 $ / shares shares | May 14, 2025 $ / shares shares | Apr. 15, 2025 $ / shares shares | Feb. 27, 2025 $ / shares shares | Dec. 23, 2024 $ / shares shares | Aug. 02, 2024 $ / shares shares | Jun. 27, 2024 $ / shares shares | Jun. 05, 2024 $ / shares shares | Mar. 01, 2024 $ / shares shares | Feb. 06, 2024 $ / shares shares | Jul. 14, 2023 USD ($) d | May 31, 2023 $ / shares shares | Mar. 23, 2023 $ / shares shares | Jun. 30, 2025 shares | Dec. 31, 2025 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2025 USD ($) $ / shares shares | Dec. 31, 2025 USD ($) $ / shares shares | Jan. 07, 2022 d
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized equity-based compensation expense, weighted average recognition period (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 7 months 2 days |  |  |  |  |
Unrecognized equity-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,000 |  |  | $ 23,000 | $ 23,000 |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,124 | $ 26,287 | $ 46,174 |  |  |
Earn-in consideration payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 932 |  | $ 0 | $ 0 |
Holbein Partners, LLP (“Holbein”) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-in expense, cash (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Earn-in expense, equity (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Earn-in share-purchase payment period | d |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10
Earn-in payment, first date |  |  |  |  |  |  |  |  |  |  |  | $ 7,100 |  |  |  |  |  |  |  |  |
Earn-in payment, second date |  |  |  |  |  |  |  |  |  |  |  | $ 8,900 |  |  |  |  |  |  |  |  |
Earn-in, share-purchase price, volume weighted average price, number of days | d |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |
Earn-in consideration payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900 |  |  |  |
RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,882 | $ 10,554 | $ 36,779 |  |  |
Number of shares vested in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,266,401 | 1,823,811 |  |  |  |
Shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,428,887 | 6,216,513 | 4,797,464 | 11,428,887 | 11,428,887 |
Shares issued in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,676,202 | 4,181,243 |  |  |  |
Fair value of shares issued (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.23 | $ 4.86 | $ 4.64 | $ 4.23 | $ 4.23 |
Shares forfeited in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 197,427 | 938,383 |  |  |  |
RSUs | Board of directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900 | $ 1,200 | $ 800 |  |  |
Shares issued in period (in shares) | shares | 231,889 |  |  |  |  |  | 45,549 | 123,732 |  | 138,564 |  |  |  | 65,554 |  |  |  |  |  |  |
Fair value of shares issued (in dollars per share) | $ / shares | $ 4.07 |  |  |  |  |  | $ 4.38 | $ 4.91 |  | $ 5.87 |  |  |  | $ 12.56 |  |  |  |  |  |  |
Vesting period (in years) | 12 months |  |  |  |  |  | 11 months | 12 months |  | 4 months |  |  |  | 9 months |  |  |  |  |  |  |
RSUs | Share-Based Payment Arrangement, Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,700 | 8,600 | 5,400 |  |  |
Shares issued in period (in shares) | shares |  |  | 79,155 |  | 2,772,576 |  |  |  | 2,219,661 |  |  |  | 4,697,317 |  |  |  |  |  |  |  |
Fair value of shares issued (in dollars per share) | $ / shares |  |  | $ 3.32 |  | $ 3.45 |  |  |  | $ 4.78 |  |  |  | $ 4.35 |  |  |  |  |  |  |  |
Vesting period (in years) |  |  | 3 years |  | 3 years |  |  |  | 3 years |  |  |  | 3 years |  |  |  |  |  |  |  |
Shares forfeited in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,028,495 |
RSUs | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,798,132 |  |  | 20,798,132 | 20,798,132 |
Available for grant (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,971,095 |  |  | 5,971,095 | 5,971,095 |
TWMH Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,200 |  |  |
Shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 | 0 |
Alvarium Employee Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,600 |  |  |
Share-based payment arrangement, accelerated cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,000 |  |  |
Share-based compensation arrangement, accelerated vesting (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |
Alvarium Employee Awards, Benefiting Acquirer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,600 |  |  |
Number of shares vested in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 360,485 |  |  |
Nasdaq Awards | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,800 |  |  |
Fair value of shares issued (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.00 |  |  |
Buy-out equity awards as restricted stock units (RSUs) | Share-Based Payment Arrangement, Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300 | 800 | $ 1,000 |  |  |
Shares issued in period (in shares) | shares |  |  |  | 81,266 |  | 57,458 |  |  |  |  | 29,154 |  |  |  |  |  |  |  |  |  |
Fair value of shares issued (in dollars per share) | $ / shares |  |  |  | $ 3.31 |  | $ 4.14 |  |  |  |  | $ 5.36 |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  | 3 years |  | 3 years |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |
Buy-out equity awards as restricted stock units (RSUs) | Share-Based Payment Arrangement, Employee | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Buy-out equity awards as restricted stock units (RSUs) | Share-Based Payment Arrangement, Employee | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Buy-out equity awards as restricted stock units (RSUs) | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600 |  |  |
Buy-out equity awards as restricted stock units (RSUs), first grant date | Share-Based Payment Arrangement, Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 111,148 |  |  |
Fair value of shares issued (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.66 |  |  |
Buy-out equity awards as restricted stock units (RSUs), second grant date | Share-Based Payment Arrangement, Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 118,987 |  |  |
Fair value of shares issued (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.72 |  |  |
Restricted Stock Units (RSUs), Retention Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000 |  |  |  |  |
PRSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,200 | 3,241 | $ 0 |  |  |
Shares issued in period (in shares) | shares |  | 263,564 |  |  |  |  |  |  | 1,567,125 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of shares issued (in dollars per share) | $ / shares |  | $ 2.82 |  |  |  |  |  |  | $ 5.76 |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Ending average stock price (in dollars per share) | $ / shares |  | $ 3.19 |  |  |  |  |  |  | $ 4.78 |  |  |  |  |  |  |  |  |  |  |  |
Volatility rate (in percent) |  | 60.70% |  |  |  |  |  |  | 62.10% |  |  |  |  |  |  |  |  |  |  |  |
Risk free rate (in percent) |  | 4.00% |  |  |  |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  | 2 years 10 months 9 days |  |  |  |  |  |  | 2 years 10 months 17 days |  |  |  |  |  |  |  |  |  |  |  |
PRSUs | Share-Based Payment Arrangement, Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares forfeited in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 289,942 |  |
Earn-in awards | Holbein Partners, LLP (“Holbein”) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900 | 4,100 | 7,000 |  |  |
Shares issued in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,686,763 |  |  |  |  |  |
Earn-in awards | East End Advisors, LLC ("EEA") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 436,816 |  |  |  |  |
Equity Awards | East End Advisors, LLC ("EEA") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,200 | 1,600 |  |  |  |
Equity Awards | Envoi, LLC (“Envoi”) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300 | 100 |  |  |  |
Revenue share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,024 | 1,077 | 1,249 |  |  |
Deferred compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,465 | 4,523 | $ 0 |  |  |
Earn In Awards | Pointwise Partners Limited ("PW") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Earn In Awards | Kontora Family Office GmbH ("Kontora") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100 |  |  |  |  |

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