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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 06, 2023 USD ($) shares | Aug. 21, 2023 USD ($) | Sep. 23, 2022 USD ($) | Jul. 19, 2022 USD ($) | May 31, 2022 USD ($) | Jul. 29, 2022 USD ($) | Sep. 30, 2023 USD ($) investment | Jun. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) investment | Jun. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) $ / shares shares | Sep. 30, 2023 EUR (€) investment | Mar. 31, 2023 USD ($) | Feb. 24, 2023 | Jan. 12, 2023 USD ($) | Dec. 31, 2022 EUR (€) | May 30, 2022 | Nov. 30, 2020
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising costs |  |  |  |  |  |  | $ 6,047,000 |  | $ 1,584,000 | $ 16,904,000 |  | $ 5,941,000 |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  | 2,060,000 |  |  | 2,060,000 |  |  | $ 2,308,000 |  |  |  |  |  |  |  |
Net of unamortized costs, origination fees, premiums and discounts |  |  |  |  |  |  | 2,028,000 |  |  | 2,028,000 |  |  | 3,851,000 |  |  |  |  |  |  |  |
Unrealized gains (losses) |  |  |  |  |  |  | (859,000) |  | (19,158,000) | 51,807,000 |  | (19,287,000) |  |  |  |  |  |  |  |  |
Financing receivable, nonaccrual |  |  |  |  |  |  | $ 41,656,000 |  |  | $ 41,656,000 |  |  | $ 7,153,000 |  |  |  |  |  |  |  |
Nonaccrual to outstanding, percent |  |  |  |  |  |  | 7.60% |  |  | 7.60% |  |  | 1.00% |  | 7.60% |  |  |  | 1.00% |  |
Loans receivable, at fair value |  |  |  |  |  |  | $ 549,142,000 |  |  | $ 549,142,000 |  |  | $ 701,652,000 |  |  |  |  |  |  |  |
Equity method investment, number of investments | investment |  |  |  |  |  |  | 2 |  |  | 2 |  |  |  |  | 2 |  |  |  |  |  |
Equity method investments, fair value disclosure |  |  |  |  |  |  | $ 603,390,000 |  |  | $ 603,390,000 |  |  | 371,948,000 |  |  |  |  |  |  |  |
Partnership investment interests |  |  |  |  |  |  |  |  |  | 38,807,000 |  |  | 70,063,000 |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  | 79,683,000 |  |  | 79,683,000 |  |  | 94,109,000 |  |  |  |  |  |  |  |
Funds held in trust account for BRPM 250 to redeem noncontrolling interests in equity of subsidiaries |  |  |  |  |  |  | 0 |  |  | 0 |  |  | 174,437,000 |  |  |  |  |  |  |  |
Warrant liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 173,000 |  |  |  |  |  |  |  |
Fair value assets |  |  |  |  |  |  | 1,628,239,000 |  |  | 1,628,239,000 |  |  | 1,841,185,000 |  |  |  |  |  |  |  |
Senior notes payable |  |  |  |  |  |  | 1,667,088,000 |  |  | 1,667,088,000 |  |  | 1,721,751,000 |  |  |  |  |  |  |  |
Fair value |  |  |  |  |  |  | 1,388,840,000 |  |  | 1,388,840,000 |  |  | 1,431,787,000 |  |  |  |  |  |  |  |
Forward exchange contracts | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 0 |  |  |  | € 0 |  |
Realized gain (loss), foreign currency transaction, before tax |  |  |  |  |  |  | 981,000 |  | 783,000 | 394,000 |  | 1,913,000 |  |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  | 32,705,000 |  |  | 32,705,000 |  |  | 41,298,000 |  |  |  |  |  |  |  |
Realized and unrealized (losses) gains on investments |  |  |  |  |  |  | (75,361,000) |  | 19,071,000 | (84,960,000) |  | (136,205,000) |  |  |  |  |  |  |  |  |
Non-cash financing activity |  |  |  |  |  |  |  |  |  | 24,780,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale and collection of finance receivables |  |  |  |  |  |  |  |  |  | 23,668,000 |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  | 20,320,000 |  |  |  |  |  |  |  |  |
Business combination, deferred cash consideration |  |  |  |  |  |  |  |  |  |  |  | 22,661,000 |  |  |  |  |  |  |  |  |
Agent fees |  |  |  |  |  |  | 2,551,000 |  | 349,000 | 2,950,000 |  | 12,437,000 |  |  |  |  |  |  |  |  |
Sold price per unit (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.00 |  |  |  |  |  |  |
Assets held in trust |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 345,000,000 |  |  |  |  |  |  |
Consummate business combination transaction term |  |  |  |  |  |  |  |  |  |  |  |  |  | 24 months |  |  |  |  |  |  |
Consummate business combination transaction term, circumstance based |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 months |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  | $ 462,312,000 |  | 312,117,000 | $ 1,300,680,000 |  | 698,578,000 |  |  |  |  |  |  |  |  |
BRPM 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 172,500,000 |  |  |  |  |  |  |
BRPM 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 172,500,000 |  |  |  |  |  |  |
FaZeClan Holdings, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in prepaid expenses and other assets |  |  |  | $ 172,584,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales of noncontrolling interests |  |  |  |  |  | $ 172,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FaZeClan Holdings, Inc | Incentive Fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,885,000 |  |  |  |  |  |  |  |
Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.50 |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash fee percentage |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |
Carried interest percentage |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash fee percentage |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |
Carried interest percentage |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |
Bebe Stores Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, ownership percentage, parent (in percentage) |  |  |  |  |  |  | 47.50% |  |  | 47.50% |  |  | 40.10% |  | 47.50% |  |  |  | 40.10% |  |
Realized and unrealized (losses) gains on investments |  |  |  |  |  |  |  |  |  | $ 12,891,000 |  |  |  |  |  |  |  |  |  |  |
Bebe Stores Inc | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, ownership percentage, parent (in percentage) | 76.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lingo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |
Subsequent acquisition, percentage |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Business combination, step acquisition, equity interest in acquiree |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  | 40.00% | 40.00%
Net tangible assets acquired and liabilities assumed |  |  |  |  |  |  | $ 1,190,000 |  |  | 1,190,000 |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, liabilities incurred |  |  |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  | 2,111,000 |  |  |  |  |  |  |  |  |  |  |
Financing receivable converted to equity |  |  |  |  | $ 17,500,000 |  |  |  |  |  |  | 17,500,000 |  |  |  |  |  |  |  |  |
Business combination, consideration transferred, equity interests issued and issuable |  |  |  |  |  |  |  |  |  |  |  | 850,000 |  |  |  |  |  |  |  |  |
Badcock Loans Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash financing activity |  |  |  |  |  |  |  |  |  | 124,397,000 |  |  |  |  |  |  |  |  |  |  |
Net tangible assets acquired and liabilities assumed |  |  |  |  |  |  | 58,872,000 |  |  | 58,872,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale and collection of finance receivables |  |  |  |  |  |  |  |  |  | 65,790,000 |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, decrease from redemptions or purchase of interests |  |  |  |  |  |  |  |  |  | 3,374,000 |  |  |  |  |  |  |  |  |  |  |
Significant unobservable inputs (Level 3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  |  |  |  | 549,142,000 |  |  | 549,142,000 |  |  | $ 701,652,000 |  |  |  |  |  |  |  |
Funds held in trust account for BRPM 250 to redeem noncontrolling interests in equity of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Warrant liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Fair value assets |  |  |  |  |  |  | $ 1,224,259,000 |  |  | $ 1,224,259,000 |  |  | 1,070,117,000 |  |  |  |  |  |  |  |
Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liabilities |  |  |  |  |  |  |  |  |  |  |  |  | $ 173,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
FRG Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  | 31.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  |  |  |  |  |  | 41.00% |  |  | 41.00% |  |  |  |  | 41.00% |  |  |  |  |  |
Investment Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  |  |  |  |  |  |  |  |  |  |  |  | 43.00% |  |  |  |  |  | 43.00% |  |
B&W |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  |  |  |  |  |  | 31.00% |  |  | 31.00% |  |  |  |  | 31.00% |  |  |  |  |  |
Bebe Stores Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,423,000 |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  | $ 30,575,000 |  |  | $ 30,575,000 |  |  | 40,383,000 |  |  |  |  |  |  |  |
Bebe Stores Inc | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock purchased during period, shares (in shares) | shares | 3,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity securities, FV-NI | $ 18,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FRG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of equity investments |  | $ 281,144,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  | $ 1,038,686,000 |  |  | $ 3,259,396,000 |  |  |  |  |  |  |  |  |  |
Secured Debt | Term Loan | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 148,200,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,890,000 |  | $ 78,296,000 |  |  |
W.S. Badcock Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire finance receivables |  |  | 168,363,000 |  |  |  |  |  |  | 145,278,000 |  |  |  | $ 400,000,000 |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  |  |  |  |  |  |  |  |  |  | 142,314,000 |  |  |  |  |  |  |  |
Freedom VCM Receivables, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire finance receivables |  |  | 58,872,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of financing receivable |  |  | $ (78,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  | 50,789,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables, fair value disclosure |  | $ 58,872,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 19.74% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable carrying value |  |  |  |  |  |  | 576,553,000 |  |  | 576,553,000 |  |  | 769,022,000 |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  |  |  | $ 578,581,000 |  |  | $ 578,581,000 |  |  | $ 772,873,000 |  |  |  |  |  |  |  |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total assets measured in Level 3 of the hierarchy level |  |  |  |  |  |  | 19.90% |  |  | 19.90% |  |  | 17.50% |  | 19.90% |  |  |  | 17.50% |  |
Loans Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable fair value |  |  |  |  |  |  | $ 549,142,000 |  |  | $ 549,142,000 |  |  | $ 701,652,000 |  |  |  |  |  |  |  |
Other fixed income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | 38,368,000 |  | $ 17,447,000 | 106,572,000 |  | 43,757,000 |  |  |  |  |  |  |  |  |
Forward Contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) forward exchange contract |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  | $ 68,000 |  |  |  |  |  |  |  |  |

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