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Affiliates - Narrative (Details)	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2024 affiliate	Sep. 30, 2024 affiliate	Sep. 30, 2023 affiliate	Dec. 31, 2023 affiliate	Jun. 30, 2024 USD ($)	Dec. 31, 2020 $ / shares
Schedule of Equity Method Investments [Line Items]
Number of unconsolidated affiliates | affiliate	1	5	5	5
Fair value of warrants (in dollar per share) | $ / shares						$ 10.0
Great Ajax F S [Member] | Carrying value
Schedule of Equity Method Investments [Line Items]
Investments, fair value disclosure | $					$ 0
2017-D
Schedule of Equity Method Investments [Line Items]
Ownership percentage by parent (as percent)	50.00%	50.00%		50.00%
Great Ajax II REIT
Schedule of Equity Method Investments [Line Items]
Ownership percentage by parent (as percent)	99.90%	99.90%		99.90%
AS Ajax E II
Schedule of Equity Method Investments [Line Items]
Ownership percentage by parent (as percent)	0.00%	0.00%
Thetis Asset Management LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percent)	19.80%	19.80%		19.80%
Great Ajax FS LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percent)	0.00%	0.00%		9.72%
Gaea Real Estate Corp.
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percent)	22.20%	22.20%		22.20%
AS Ajax E LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percent)	0.00%	0.00%		16.50%
Loan pool LLCs
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percent)	0.00%	0.00%		40.00%

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