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Description of the Business - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
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May 13, 2025 $ / shares shares | Jul. 31, 2024 USD ($) director $ / shares shares | May 15, 2024 shares | Mar. 27, 2024 shares | Feb. 22, 2024 USD ($) $ / shares shares | Apr. 03, 2023 shares | Mar. 31, 2024 | Mar. 31, 2023 shares | Dec. 31, 2025 USD ($) employee segment $ / shares shares | Jun. 30, 2025 segment | Jun. 30, 2023 USD ($) | Dec. 31, 2025 USD ($) employee $ / shares shares | Dec. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) shares | Jun. 07, 2023 shares | Jan. 03, 2023 | Jan. 01, 2023 $ / shares
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets under management | $ |  |  |  |  |  |  |  |  | $ 93,100,000 |  |  | $ 93,100,000 |  |  |  |  |
Number of professionals | employee |  |  |  |  |  |  |  |  | 490 |  |  | 490 |  |  |  |  |
Number of securities called by warrants or rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,892,387 |  |
Adjustments to additional paid-in-capital | $ |  |  |  |  |  |  |  |  |  |  | $ 29,500 |  | $ 9,594 |  |  |  |
Warrants, outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Series C redeemable cumulative convertible preferred stock, issued (in shares) |  |  |  |  |  |  |  |  | 150,000 |  |  | 150,000 |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 1 | 2 |  |  |  |  |  |  |
Assets under advisement | $ |  |  |  |  |  |  |  |  | $ 93,100,000 |  |  | $ 93,100,000 | $ 67,300,000 |  |  |  |
Alternatives Platform, Externally - Managed Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets under management | $ |  |  |  |  |  |  |  |  | 5,500,000 |  |  | 5,500,000 |  |  |  |  |
Alternatives Platform, Internally - Managed Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets under management | $ |  |  |  |  |  |  |  |  | 1,800,000 |  |  | 1,800,000 |  |  |  |  |
Externally Managed Funds, Romspen, Real Estate Bridge Lending Strategy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets under advisement | $ |  |  |  |  |  |  |  |  | 1,900,000 |  |  | 1,900,000 |  |  |  |  |
Externally Managed Funds, Zebedee, European Equities Strategy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets under advisement | $ |  |  |  |  |  |  |  |  | 2,500,000 |  |  | 2,500,000 |  |  |  |  |
Externally Managed Funds, Arkkan, Asian Credit And Special Situations Strategy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets under advisement | $ |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  | $ 1,100,000 |  |  |  |  |
Constellation warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant, exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.40 |  |  |  |
Allianz Strategic Investments S.à.r.l. (“Allianz”) | Allianz Investment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received | $ |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total voting power (in percent) |  |  |  |  |  |  |  |  | 70.00% |  |  | 70.00% |  |  |  |  |
Warrant, exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.50
Issuance of shares - exercise of warrants (in shares) |  |  |  |  |  | 78,864 |  | 428,626 |  |  |  |  |  |  |  |  |
Number of securities called by warrants or rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,962,147 |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 | $ 0.0001 |  |  |  |
Class A Common Stock | Allianz warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares - exercise of warrants (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Class A Common Stock | Constellation warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares - exercise of warrants (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Number of securities called by warrants or rights (in shares) |  |  | 466,667 | 1,533,333 |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |
Class A Common Stock | Allianz Strategic Investments S.à.r.l. (“Allianz”) | Allianz Investment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  | 19,318,580.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable (in percent) |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership cap (in percent) |  | 24.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of directors available for nomination | director |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold of ownership (in percent) |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock | Allianz Strategic Investments S.à.r.l. (“Allianz”) | Allianz Investment Agreement | Allianz warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant, exercise price (in dollars per share) | $ / shares |  | $ 7.40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of securities called by warrants or rights (in shares) |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total voting power (in percent) |  |  |  |  |  |  |  |  | 30.00% |  |  | 30.00% |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 | $ 0.0001 |  |  |  |
Class B Common Stock | Allianz Strategic Investments S.à.r.l. (“Allianz”) | Allianz Investment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership cap (in percent) |  | 24.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock | $ |  |  |  |  |  |  |  |  | $ 168,934 |  |  | $ 168,934 | $ 142,858 | $ 0 |  |  |
Series C redeemable cumulative convertible preferred stock, issued (in shares) |  |  |  |  |  |  |  |  | 168,934 |  |  | 168,934 | 140,000 |  |  |  |
Preferred stock, outstanding (in shares) |  |  |  |  |  |  |  |  | 168,934 |  |  | 168,934 | 140,000 | 0 |  |  |
Series A Preferred Stock | Related party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock | $ |  |  |  |  |  |  |  |  | $ 168,934 |  |  | $ 168,934 | $ 142,858 |  |  |  |
Series A Preferred Stock | Allianz Strategic Investments S.à.r.l. (“Allianz”) | Allianz Investment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  | 140,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate (in percent) |  | 9.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, per-dollar amount (in dollars per share) | $ / shares | $ 1,000 | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable (in percent) |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock | Allianz Strategic Investments S.à.r.l. (“Allianz”) | Allianz Investment Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate (in percent) |  | 9.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock | Allianz Strategic Investments S.à.r.l. (“Allianz”) | Allianz Investment Agreement | Allianz Tranche Right |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of securities called by warrants or rights (in shares) | 18,471 |  |  |  | 50,000 |  |  |  | 1,523,289 |  |  | 1,523,289 |  |  |  |  |
Preferred stock, dividend rate, per-dollar amount (in dollars per share) | $ / shares |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Value of securities called by warrant or right | $ |  |  |  |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |
Class C Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 | $ 0.0001 |  |  |  |
Class C Common Stock | Allianz Strategic Investments S.à.r.l. (“Allianz”) | Allianz Investment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate (in percent) |  |  |  |  |  |  | 9.75% |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, per-dollar amount (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Preferred stock | $ |  |  |  |  |  |  |  |  | $ 176,904 |  |  | $ 176,904 | $ 160,808 | $ 0 |  |  |
Less: Preferred stock dividends | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000 |  |  |  |
Series C redeemable cumulative convertible preferred stock, issued (in shares) |  |  |  |  |  |  |  |  | 150,000 |  |  | 150,000 | 150,000 |  |  |  |
Preferred stock, outstanding (in shares) |  |  |  |  |  |  |  |  | 150,000 |  |  | 150,000 | 150,000 | 0 |  |  |
Preferred stock, total voting power (in percent) |  |  |  |  |  |  |  |  | 7.50% |  |  | 7.50% |  |  |  |  |
Series C Preferred Stock | Related party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock | $ |  |  |  |  |  |  |  |  | $ 176,904 |  |  | $ 176,904 | $ 160,808 |  |  |  |
Series C Preferred Stock | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate (in percent) |  |  |  |  |  |  |  |  |  |  |  |  | 9.75% |  |  |  |
Series C Preferred Stock | CWC AlTi Investor LLC (“Constellation”) | Constellation Investment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  |  | 35,000 | 115,000 |  |  |  |  |  |  |  |  | 150,000 |  |  |  |
Umbrella |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting interest acquired (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00% |
Umbrella | TWMH and TIG Shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting interest acquired (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |
TWMH, TIG, and Alvarium | Umbrella |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting interest acquired (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |

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