INVESTMENTS - Narrative (Details)	1 Months Ended				8 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($)	May 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2022 USD ($) shippingContainer	Dec. 31, 2022 USD ($) shippingContainer	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2012	Oct. 01, 2022	Jun. 15, 2022	Nov. 30, 2021 USD ($)	Jul. 31, 2020 USD ($)
Equity Method Investments and Joint Ventures [Abstract]
Investments					$ 73,589,000	$ 73,589,000	$ 54,408,000
Schedule of Equity Method Investments [Line Items]
Existing substantive participation rights percentage									49.00%
Investments					73,589,000	73,589,000	54,408,000
Total assets					2,478,399,000	2,478,399,000	2,442,301,000
Total liabilities					1,689,015,000	1,689,015,000	980,255,000
Goodwill					260,252,000	260,252,000	257,137,000
Revenue						261,966,000	120,219,000	$ 68,562,000
Equity in losses of unconsolidated entities						(67,399,000)	(13,499,000)	(3,107,000)
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Revenue					47,900,000
FYX Investment
Schedule of Equity Method Investments [Line Items]
Total assets		$ 13,700,000
Cash		700,000
Total liabilities		10,100,000
Goodwill		5,400,000
Intermodal Finance I, Ltd.
Equity Method Investments and Joint Ventures [Abstract]
Investments					$ 0	$ 0	0
Schedule of Equity Method Investments [Line Items]
Ownership Percentage					51.00%	51.00%			51.00%
Number of components owned in portfolio | shippingContainer					273	273
Investments					$ 0	$ 0	0
Equity in losses of unconsolidated entities						151,000	470,000	115,000
Long Ridge Energy & Power LLC
Equity Method Investments and Joint Ventures [Abstract]
Investments				$ 155,600,000	$ 0	$ 0	0
Schedule of Equity Method Investments [Line Items]
Ownership Percentage				50.10%	50.00%	50.00%
Ownership percentage sold				49.90%
Proceeds from sale of equity investment				$ 150,000,000
Realized gain on sale				116,700,000
Investments				$ 155,600,000	$ 0	$ 0	0
PIK interest rate										16.00%
Note receivable					27,500,000	27,500,000
Equity in losses of unconsolidated entities						(60,538,000)	(13,597,000)	(3,222,000)
GM-FTAI Holdco LLC
Equity Method Investments and Joint Ventures [Abstract]
Investments					68,025,000	68,025,000	52,295,000
Schedule of Equity Method Investments [Line Items]
Ownership Percentage											27.00%
Investments					$ 68,025,000	68,025,000	52,295,000
Payments to acquire investment			$ 52,500,000
Equity in losses of unconsolidated entities						$ (5,571,000)	(205,000)	0
GM-FTAI Holdco LLC | Common 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 | Common Class A | Gladieux Metals Recycling ("GMR")
Schedule of Equity Method Investments [Line Items]
Ownership Percentage					1.00%	1.00%
GM-FTAI Holdco LLC | Common Class B
Schedule of Equity Method Investments [Line Items]
Ownership Percentage			50.00%
GM-FTAI Holdco LLC | Common Class B | Aleon Renewable Metals LLC (“Aleon”)
Schedule of Equity Method Investments [Line Items]
Ownership Percentage					50.00%	50.00%
Gladieux Metals Recycling ("GMR") | GM-FTAI Holdco LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage			100.00%		100.00%	100.00%
Aleon Renewable Metals LLC (“Aleon”) | GM-FTAI Holdco LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage			100.00%		100.00%	100.00%
Clean Planet Energy USA LLC
Equity Method Investments and Joint Ventures [Abstract]
Investments					$ 5,564,000	$ 5,564,000	858,000					$ 1,000,000
Schedule of Equity Method Investments [Line Items]
Ownership Percentage					50.00%	50.00%						50.00%
Investments					$ 5,564,000	$ 5,564,000	858,000					$ 1,000,000
Equity in losses of unconsolidated entities						(1,441,000)	(167,000)	$ 0
FYX Trust HoldCo LLC
Equity Method Investments and Joint Ventures [Abstract]
Investments					$ 0	$ 0	$ 1,255,000						$ 1,300,000
Schedule of Equity Method Investments [Line Items]
Ownership Percentage					66.00%	66.00%	14.00%						14.00%
Investments					$ 0	$ 0	$ 1,255,000						$ 1,300,000
FYX Investment
Schedule of Equity Method Investments [Line Items]
Payments to acquire investment	$ 100,000	$ 4,600,000
Equity method investment, additional percentage acquired	1.00%	51.00%
Equity in losses of unconsolidated entities					1,400,000
Non-controlling interest by private equity fund					$ 3,700,000	$ 3,700,000