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Equity-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  | 12 Months Ended | 19 Months Ended |
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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 | Aug. 01, 2023 $ / shares shares | Jul. 14, 2023 USD ($) d | May 31, 2023 $ / shares shares | Mar. 23, 2023 $ / shares shares | Dec. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) $ / shares shares | Jan. 07, 2022 d
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized equity-based compensation expense |  |  |  |  |  |  |  |  |  |  | $ 18,400 |  |  | $ 18,400 |
Unrecognized equity-based compensation expense, weighted average recognition period (in years) |  |  |  |  |  |  |  |  |  |  | 1 year 8 months 26 days |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  | $ 26,287 | $ 46,174 | $ 3,716 |  |
Earn-in consideration payable |  |  |  |  |  |  |  |  |  |  | $ 932 | 1,830 |  | 932 |
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 | 1,800 |  | $ 900 |
Class A Common Stock | TIH SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  |  | 1,200 |  |  |
Shares issued in period (in shares) | shares |  |  |  |  |  |  | 152,930 |  |  |  |  |  |  |  |
Fair value of shares issued (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 7.70 |  |  |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  | $ 10,554 | $ 36,779 | $ 0 |  |
Number of shares vested in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 1,823,811 | 2,534,202 |  |  |
Shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 6,216,513 | 4,797,464 | 0 | 6,216,513 |
Shares issued in period (in shares) | shares |  |  |  | 2,219,661 |  |  |  |  | 4,697,317 |  | 4,181,243 | 7,514,293 |  |  |
Fair value of shares issued (in dollars per share) | $ / shares |  |  |  | $ 4.78 |  |  |  |  | $ 4.35 |  | $ 4.86 | $ 4.64 | $ 0 | $ 4.86 |
Vesting period |  |  |  | 3 years |  |  |  |  | 3 years |  |  |  |  |  |
Shares forfeited in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 938,383 | 182,627 |  |  |
RSUs | Share-Based Payment Arrangement, Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  | $ 8,600 | $ 5,400 |  |  |
Shares forfeited in period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 857,939 |
RSUs | Board of directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  | $ 1,200 | 800 |  |  |
Shares issued in period (in shares) | shares |  | 45,549 | 123,732 |  | 138,564 |  |  |  |  | 65,554 |  |  |  |  |
Fair value of shares issued (in dollars per share) | $ / shares |  | $ 4.38 | $ 4.91 |  | $ 5.87 |  |  |  |  | $ 12.56 |  |  |  |  |
Vesting period |  | 11 months | 12 months |  | 4 months |  |  |  |  | 9 months |  |  |  |  |
RSUs | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 11,788,132 |  |  | 11,788,132 |
Available for grant (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 1,213,605 |  |  | 1,213,605 |
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 |
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, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  | $ 800 | $ 1,000 |  |  |
Shares issued in period (in shares) | shares | 57,458 |  |  |  |  | 29,154 |  |  |  |  |  |  |  |  |
Fair value of shares issued (in dollars per share) | $ / shares | $ 4.14 |  |  |  |  | $ 5.36 |  |  |  |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |
Buy-out equity awards as restricted stock units (RSUs) | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Buy-out equity awards as restricted stock units (RSUs) | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  | 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, 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, 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 |  |  |
PRSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  | $ 3,241 | $ 0 | $ 0 |  |
Shares issued in period (in shares) | shares |  |  |  | 1,567,125 |  |  |  |  |  |  |  |  |  |  |
Fair value of shares issued (in dollars per share) | $ / shares |  |  |  | $ 5.76 |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Ending average stock price (in dollars per share) | $ / shares |  |  |  | $ 4.78 |  |  |  |  |  |  |  |  |  |  |
Volatility rate (in percent) |  |  |  | 62.10% |  |  |  |  |  |  |  |  |  |  |
Risk free rate (in percent) |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  |  | 2 years 10 months 17 days |  |  |  |  |  |  |  |  |  |  |
Earn-in awards | Holbein Partners, LLP (“Holbein”) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  | $ 4,100 | 7,000 | 3,700 |  |
TIH SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  | 0 | 1,178 | 0 |  |
Revenue share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  | 1,077 | 1,249 | 0 |  |
Deferred compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  | 4,523 | $ 0 | $ 0 |  |
Equity Awards | Envoi, LLC (“Envoi”) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |
Equity Awards | East End Advisors, LLC ("EEA") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  | 1,600 |  |  |  |
Equity Awards | Pointwise Partners Limited ("PW") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost. + References No definition available. + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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