Organization and Basis of Presentation (Details) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended		12 Months Ended		27 Months Ended
	Feb. 26, 2024 USD ($) $ / shares	Jan. 31, 2023 USD ($)	Nov. 22, 2019 USD ($)	Jan. 31, 2022 USD ($)	Mar. 31, 2024 USD ($) entity payment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) entity shares	Dec. 31, 2020 USD ($)	Jan. 31, 2022 USD ($) shares	Aug. 31, 2022 USD ($)
Organization And Basis Of Presentation [Line Items]
Number of payments made on RPL mortgage loans (at least) | payment					5
Number of payments not made on NPL mortgage loans | payment					3
SBC loans principal amount					$ 5,000
Sale of stock, termination of contract	$ 15,500
Proceeds from issuance of private placement								$ 125,000
Number of non controlling interest subsidiaries | entity					3		3
Investment in equity method investments					$ 0	$ 726
Senior notes | 8.875% Senior Unsecured Notes Due September 2027
Organization And Basis Of Presentation [Line Items]
Original Principal										$ 110,000
Interest rate (in percent)										8.875%
Rithm
Organization And Basis Of Presentation [Line Items]
Sale of stock, termination of contract	15,500
Rithm | Secured Debt | Line of Credit
Organization And Basis Of Presentation [Line Items]
Original Principal	70,000
Sale of stock, consideration to be received on transaction	$ 14,000
Stock price of common stock (in dollars per share) | $ / shares	$ 4.87
Sale of stock, average trailing closing price, period (in days)	5 days
Great Ajax II REIT
Organization And Basis Of Presentation [Line Items]
Ownership percentage by parent (as percent)					99.90%		99.90%
AS Ajax E II LLC
Organization And Basis Of Presentation [Line Items]
Ownership percentage by parent (as percent)					53.10%		53.10%
2017-D
Organization And Basis Of Presentation [Line Items]
Ownership percentage by parent (as percent)					50.00%		50.00%
Ownership percentage by parent (in percent)					50.00%		50.00%
2017-D | Third party
Organization And Basis Of Presentation [Line Items]
Ownership percentage by parent (in percent)					50.00%
Thetis Asset Management LLC
Organization And Basis Of Presentation [Line Items]
Ownership percentage (in percent)					19.80%		19.80%
Gaea Real Estate Corp.
Organization And Basis Of Presentation [Line Items]
Ownership percentage (in percent)					22.20%		22.20%
Proceeds from issuance of private placement			$ 66,300	$ 30,000					$ 96,300
Private capital raise, number common stock and warrants issued (in shares) | shares									1,704,436
Gaea Real Estate Corp. | GA-TRS
Organization And Basis Of Presentation [Line Items]
Private capital raise, number common stock and warrants issued (in shares) | shares							20,991
Private capital raise amount							$ 300
Investment in Ajax E Master Trust | AS Ajax E LLC
Organization And Basis Of Presentation [Line Items]
Ownership interest in real estate trust (in percent)					5.00%		5.00%
Great Ajax FS LLC
Organization And Basis Of Presentation [Line Items]
Ownership percentage (in percent)					9.70%		9.70%
Investment in equity method investments		$ 700
Residential RPLs
Organization And Basis Of Presentation [Line Items]
Number of recent payments made on RPL mortgage loans | payment					7