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Affiliates - Schedule of Net Income, Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at the Company's share	$ (624)	$ (628)	$ (1,077)	$ (991)
Assets at Company's share	858,151		858,151		$ 1,336,291
Liabilities at Company's share	611,058		611,058		1,025,396
AS Ajax E LLC
Schedule of Equity Method Investments [Line Items]
Assets at Company's share	0		0		420
Liabilities at Company's share	0		0		6
Great Ajax FS LLC
Schedule of Equity Method Investments [Line Items]
Assets at Company's share	0		0		6,854
Liabilities at Company's share	0		0		5,748
Loan pool LLCs
Schedule of Equity Method Investments [Line Items]
Assets at Company's share	0		0		480
Liabilities at Company's share	0		0		93
Gaea Real Estate Corp.
Schedule of Equity Method Investments [Line Items]
Assets at Company's share	0		0		37,272
Liabilities at Company's share	0		0		16,346
Thetis Asset Management LLC
Schedule of Equity Method Investments [Line Items]
Assets at Company's share	531		531		919
Liabilities at Company's share	17		17		$ 258
AS Ajax E LLC
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	0	52	81	174
Net income/(loss) at the Company's share	$ 0	9	$ 13	29
Ownership percentage (in percent)	0.00%		0.00%		16.50%
AS Ajax E LLC | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 0		$ 0		$ 2,553
AS Ajax E LLC | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	0		0		$ 39
Great Ajax FS LLC
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	0	(92)	(269)	(1,066)
Net income/(loss) at the Company's share	$ 0	(9)	$ (26)	(96)
Ownership percentage (in percent)	0.00%		0.00%		9.72%
Great Ajax FS LLC | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 0		$ 0		$ 71,477
Great Ajax FS LLC | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	0		0		$ 59,949
Loan pool LLCs
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	0	(16)	(34)	(56)
Net income/(loss) at the Company's share	$ 0	(6)	$ (14)	(22)
Ownership percentage (in percent)	0.00%		0.00%		40.00%
Loan pool LLCs | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 0		$ 0		$ 1,200
Loan pool LLCs | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	0		0		$ 232
Gaea Real Estate Corp.
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	0	(4,584)	(594)	(6,916)
Net income/(loss) at the Company's share	$ 0	(1,007)	$ (108)	(1,520)
Ownership percentage (in percent)	22.20%		22.20%		22.20%
Gaea Real Estate Corp. | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 0		$ 0		$ 167,591
Gaea Real Estate Corp. | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	0		0		$ 73,499
Thetis Asset Management LLC
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	(950)	1,713	10,906	1,577
Net income/(loss) at the Company's share	$ (188)	$ 339	$ 2,160	$ 312
Ownership percentage (in percent)	19.80%		19.80%		19.80%
Thetis Asset Management LLC | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 2,682		$ 2,682		$ 4,643
Thetis Asset Management LLC | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 84		$ 84		$ 1,305
Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percent)	100.00%	100.00%	100.00%	100.00%	100.00%

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