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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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