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INVESTMENTS - Narrative (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 06, 2024 USD ($) $ / shares shares | Nov. 30, 2023 USD ($) | Nov. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2024 USD ($) shippingContainer $ / shares | Mar. 31, 2023 USD ($) | Dec. 31, 2012 | Dec. 31, 2023 USD ($) $ / shares | Nov. 17, 2023 USD ($) | Oct. 01, 2022 | Jun. 15, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Existing substantive participation rights percentage |  |  |  |  |  |  |  | 49.00% |  |  |  |
Investment in promissory notes and loans |  |  |  |  |  | $ 0 | $ 20,500 |  |  |  |  |
Carrying value |  |  |  |  |  | $ 68,085 |  |  | $ 72,701 |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  | $ 4.93 |  |  | $ 4.93 |  |  |
Fair value of warrants |  |  |  |  |  | $ 21,000 |  |  |  |  |  |
Intermodal Finance I, Ltd. |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  | 51.00% |  | 51.00% |  |  |  |
Number of components owned in portfolio | shippingContainer |  |  |  |  |  | 173 |  |  |  |  |  |
Carrying value |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  |
Long Ridge Energy & Power LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  | 50.10% |  |  |  |  |  |
Ownership percentage sold |  |  |  |  | 49.90% |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  | $ 150,000 |  |  |  |  |  |  |
Note receivable |  |  |  |  |  |  |  |  |  |  | 13.00% |
Note receivable |  |  |  |  |  | $ 73,300 |  |  | 71,000 |  |  |
Carrying value |  |  |  |  |  | $ 0 |  |  | 0 |  |  |
GM-FTAI Holdco LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  | 27.00% |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  | $ 52,500 |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  | $ 51,255 |  |  | 55,740 |  |  |
GM-FTAI Holdco LLC | Class A |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  | 1.00% |  |  |  |  |  |  |  |
Increase in ownership percentage from exchange of share |  |  |  |  |  |  |  |  |  |  |  | 20.00%
Increase in ownership percentage from debt termination |  |  |  |  |  |  |  |  |  |  |  | 8.50%
GM-FTAI Holdco LLC | Class A | Gladieux Metals Recycling (“GMR”) |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  | 1.00% |  |  |  |  |  |  |  |
GM-FTAI Holdco LLC | Class B |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  | 50.00% |  |  |  |  |  |  |  |
GM-FTAI Holdco LLC | Class B | Aleon Renewable Metals LLC (“Aleon”) |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  | 50.00% |  |  |  |  |  |  |  |
Gladieux Metals Recycling (“GMR”) | GM-FTAI Holdco LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  | 100.00% |  |  |  |  |  |
Aleon Renewable Metals LLC (“Aleon”) | GM-FTAI Holdco LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  | 100.00% |  |  |  |  |  |
Clean Planet Energy USA LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  | 50.00% |  |  | 50.00% |  |  |  |  |  |
Payments to acquire equity method investments |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  | $ 10,117 |  |  | 10,136 |  |  |
Long Ridge West Virginia LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  | 50.10% |  |  |  |  |  |
Ownership percentage sold |  | 49.90% |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  | $ 7,500 |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  | $ 6,713 |  |  | $ 6,825 | $ 7,200 |  |
E-Circuit Motors, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire other investments | $ 5,000 |  |  |  |  |  |  |  |  |  |  |
Number of common shares called by warrants (in shares) | shares | 166,667 |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |  |  |
Conversion ratio | 1 |  |  |  |  |  |  |  |  |  |  |
Warrants, term | 2 years |  |  |  |  |  |  |  |  |  |  |
Equity securities, value | $ 2,500 |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants | $ 2,500 |  |  |  |  |  |  |  |  |  |  |
Other investments |  |  |  |  |  | $ 5,000 |  |  |  |  |  |
E-Circuit Motors, Inc. | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity securities (in shares) | shares | 166,667 |  |  |  |  |  |  |  |  |  |  |

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