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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (I-P) (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 06, 2023 USD ($) shares | Aug. 21, 2023 USD ($) | Mar. 31, 2024 USD ($) company investment | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) investment | Dec. 31, 2023 USD ($) investment | Dec. 31, 2021 USD ($) $ / shares shares | Sep. 30, 2023 investment
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Equity method investment, number of investments | investment |  |  | 5 |  | 5 | 5 |  | 5
Equity method investment, number of investments with significant influence | investment |  |  | 4 |  |  |  |  |
Equity method investments, fair value disclosure |  |  | $ 288,436 |  | $ 283,057 | $ 283,057 |  |
Equity securities, FV-NI, unrealized loss |  |  | 42,405 |  |  |  |  |
Equity securities, FV-NI, unrealized gain |  |  |  |  | 5,899 |  |  |
Partnership investment interests |  |  | 18,964 |  |  | 35,196 |  |
Total liabilities measured at fair value |  |  | 41,346 |  | 42,421 | 42,421 |  |
Fair value assets |  |  | 1,315,265 |  | 1,524,874 | 1,524,874 |  |
Senior notes payable |  |  | 1,553,616 |  | 1,668,021 | 1,668,021 |  |
Fair value |  |  | 1,038,272 |  | 1,127,503 | 1,127,503 |  |
Notes payable, fair value disclosure |  |  | 632,784 |  | 688,343 | 688,343 |  |
Realized gain (loss), foreign currency transaction, before tax |  |  | 2,268 | $ 234 |  |  |  |
Equity investment |  |  | 2,046 |  | 2,087 | 2,087 |  |
Loss from equity investments |  |  | (4) | (10) |  |  |  |
Proceeds from sale of productive assets |  |  | 2,000 |  |  |  |  |
Non-cash financing activity |  |  | 42,077 | 15,000 |  |  |  |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  |  | 215,477 |  | 209,395 | 209,395 |  |
Agent fees |  |  | $ 372 | 0 |  |  |  |
Sold price per unit (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 10.00 |
Consummate business combination transaction term |  |  |  |  |  |  | 24 months |
Consummate business combination transaction term, circumstance based |  |  |  |  |  |  | 27 months |
Common Class A |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Exercise price per share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 11.50 |
IPO |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Consummated units (in shares) | shares |  |  |  |  |  |  | 17,250,000 |
IPO | Common Class A |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Class of warrant or right, number of securities called by each warrant or right (in shares) | shares |  |  |  |  |  |  | 1 |
Bebe Stores Inc |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Subsidiary, ownership percentage, parent (in percentage) | 76.20% |  | 41.30% |  |  |  |  |
Lingo |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Net tangible assets acquired and liabilities assumed |  |  | $ 1,190 |  |  |  |  |
Issuance of common stock |  |  | 2,111 |  |  |  |  |
Consideration transferred, liabilities incurred |  |  |  | $ 7,000 |  |  |  |
Significant unobservable inputs (Level 3) |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Total liabilities measured at fair value |  |  | 34,923 |  | 33,820 | 33,820 |  |
Fair value assets |  |  | $ 1,127,175 |  | $ 1,268,057 | $ 1,268,057 |  |
Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Percentage of total assets measured in Level 3 of the hierarchy level |  |  | 22.60% |  | 20.90% | 20.90% |  |
BRPM 250 |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Proceeds |  |  |  |  |  |  | $ 172,500 |
FRG |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure |  |  | $ 244,638 |  | $ 287,043 | $ 287,043 |  |
Purchase of equity investments |  | $ 281,144 |  |  |  |  |  |
Other Equity Investments |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure |  |  | $ 72,145 |  | 87,713 | 87,713 |  |
Equity method investment, number of private companies | company |  |  | 6 |  |  |  |  |
Freedom VCM Holdings, LLC |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure |  |  | $ 197,782 |  | 232,065 | 232,065 |  |
Purchase of equity investments |  | 216,500 |  |  |  |  |  |
Take-private transaction, vote or disposal, amount of shares |  | 64,644 |  |  |  |  |  |
Repurchase amount |  | 20,911 |  |  |  |  |  |
Freedom VCM Receivables, Inc. | Related Party |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale of financing receivable |  | (78) |  |  |  |  |  |
Payments to acquire finance receivables |  | $ 58,872 |  |  |  |  |  |
Interest rate |  | 19.74% |  |  |  |  |  |
FRG Investment |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Rate of equity interests |  | 31.00% |  |  |  |  |  |
B&W |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Rate of equity interests |  |  | 31.00% |  |  |  |  |
Equity method investments, fair value disclosure |  |  | $ 31,015 |  | 40,072 | 40,072 |  |
Synchronoss Technologies, Inc. |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Rate of equity interests |  |  | 14.00% |  |  |  |  |
Equity method investments, fair value disclosure |  |  | $ 11,806 |  | $ 8,780 | $ 8,780 |  |
Bebe Stores Inc |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Stock purchased during period, shares (in shares) | shares | 3,700,000 |  |  |  |  |  |  |
Payments to acquire equity securities, FV-NI | $ 18,500 |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cash fee percentage |  |  | 10.00% |  |  |  |  |
Carried interest percentage |  |  | 15.00% |  |  |  |  |
Maximum | Other Four Investments |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Rate of equity interests |  |  | 20.00% |  |  |  |  |
Maximum | Brand Investment |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Rate of equity interests |  |  | 50.00% |  |  |  |  |
Minimum |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cash fee percentage |  |  | 7.00% |  |  |  |  |
Carried interest percentage |  |  | 8.00% |  |  |  |  |
Minimum | Brand Investment |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Rate of equity interests |  |  | 10.00% |  |  |  |  |

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