Organization and Basis of Presentation (Details)		1 Months Ended	3 Months Ended
	Nov. 22, 2019 USD ($)	Jan. 31, 2022 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2022 USD ($) payment entity	Dec. 31, 2021 entity	Mar. 31, 2021	Dec. 31, 2018
Organization And Basis Of Presentation [Line Items]
Number of payments made on RPL mortgage loans (at least) | payment				5
SBC loans principal amount				$ 5,000,000
Number of payments made on NPL mortgage loans | payment				3
Proceeds from issuance of private placement			$ 125,000,000
Number of non controlling interest subsidiaries | entity				3	3
Great Ajax II REIT
Organization And Basis Of Presentation [Line Items]
Ownership percentage by parent				99.90%	99.90%
2017-D
Organization And Basis Of Presentation [Line Items]
Ownership percentage by parent				50.00%	50.00%
Ownership percentage by parent				50.00%	50.00%
2018-C
Organization And Basis Of Presentation [Line Items]
Ownership percentage by parent						63.00%
AS Ajax E II LLC
Organization And Basis Of Presentation [Line Items]
Ownership percentage by parent				53.10%	53.10%
AS Ajax E II LLC | Third party
Organization And Basis Of Presentation [Line Items]
Ownership percentage by parent				46.90%
Great Ajax II REIT | Third party
Organization And Basis Of Presentation [Line Items]
Ownership percentage by parent				0.10%	0.10%
2018-C | Third party
Organization And Basis Of Presentation [Line Items]
Ownership percentage by third parties				0.00%	0.00%
Ownership percentage by parent						37.00%
Third party | 2017-D
Organization And Basis Of Presentation [Line Items]
Ownership percentage by parent				50.00%
Great Ajax FS
Organization And Basis Of Presentation [Line Items]
Ownership percentage				8.00%			8.00%
Thetis Asset Management LLC
Organization And Basis Of Presentation [Line Items]
Ownership percentage				19.80%
Gaea Real Estate Corp.
Organization And Basis Of Presentation [Line Items]
Ownership percentage	23.20%			22.20%
Proceeds from issuance of private placement	$ 66,300,000	$ 30,000,000
Gaea Real Estate Corp. | Third party
Organization And Basis Of Presentation [Line Items]
Ownership percentage by third parties	76.80%			77.80%
Ajax E Master Trust | As Ajax E LLC
Organization And Basis Of Presentation [Line Items]
Ownership interest in real estate trust				5.00%