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Affiliates - Narrative (Details) $ in Thousands				3 Months Ended	6 Months Ended		12 Months Ended
	Nov. 22, 2019 USD ($) shares	May 29, 2018 USD ($) warrant shares	Jan. 26, 2018 USD ($) warrant shares	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) numberOfLoanPools	Dec. 31, 2018 transaction	Mar. 14, 2016
Schedule of Equity Method Investments [Line Items]
Proceeds from issuance of preferred stock and warrants, net of offering costs				$ 130,000	$ 124,977	$ 0
Percentage of ownership interests in joint venture				34.00%	34.00%
2017-D
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interests in joint venture				50.00%	50.00%
Great Ajax II REIT
Schedule of Equity Method Investments [Line Items]
Company ownership percentage					99.80%
Great Ajax II REIT | Third Party
Schedule of Equity Method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners				0.20%	0.20%
Thetis
Schedule of Equity Method Investments [Line Items]
Ownership percentage				19.80%	19.80%
AS Ajax E LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage				16.50%	16.50%		16.50%		24.20%
Ajax E Master Trust | AS Ajax E LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage				5.00%	5.00%
Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Ownership percentage				100.00%	100.00%
Gaea
Schedule of Equity Method Investments [Line Items]
Proceeds from issuance of preferred stock and warrants, net of offering costs	$ 66,300
Private placement share issuance | shares	4,419,641
Ownership percentage	23.20%
Gaea | Third Party
Schedule of Equity Method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	76.80%
Great Ajax FS LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage				8.00%	8.00%
Number of transactions | transaction								2
Percentage of equity interest at closing date		3.10%	4.90%
Number of warrants | warrant		3	3
Percentage of warrants exercisable		1.55%	2.45%
Cash payment in business acquisition		$ 700	$ 1,100
Number of shares (in shares) | shares		29,063	45,938
Common stock value		$ 400	$ 600
Legacy entities
Schedule of Equity Method Investments [Line Items]
Number of entities | numberOfLoanPools							3
Ownership percentage							40.40%
Cash payment in business acquisition							$ 1,000

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