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Distressed and Other Residential Mortgage Loans, Net - Schedule of Geographic Concentrations of Credit Risk of Unpaid Principal Balances (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.80%	11.30%
Florida | Distressed residential mortgage loans held in securitization trusts, net | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	10.60%	10.40%
North Carolina | Distressed residential mortgage loans held in securitization trusts, net | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	9.70%	9.00%
Georgia
Concentration Risk [Line Items]
Geographic concentration, percent	14.60%	15.30%
Georgia | Distressed residential mortgage loans held in securitization trusts, net | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	5.90%	7.20%
New York | Distressed residential mortgage loans held in securitization trusts, net | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	5.70%	5.40%
Virginia
Concentration Risk [Line Items]
Geographic concentration, percent	8.60%	9.10%
Virginia | Distressed residential mortgage loans held in securitization trusts, net | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	5.60%	5.30%
South Carolina
Concentration Risk [Line Items]
Geographic concentration, percent	9.10%	9.50%
South Carolina | Distressed residential mortgage loans held in securitization trusts, net | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	5.60%	5.60%
Ohio | Distressed residential mortgage loans held in securitization trusts, net | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	5.30%	5.00%
Texas
Concentration Risk [Line Items]
Geographic concentration, percent	11.90%	16.60%
Texas | Distressed residential mortgage loans held in securitization trusts, net | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	5.20%	4.90%
California | Distressed residential mortgage loans held in securitization trusts, net | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	5.10%	4.80%

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