INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS, EQUITY METHOD INVESTEES - Summary of the Geographic Distribution of the Underlying Residential Mortgage Loans of the Excess MSR Investments made through Equity Method Investees (Details) (Mortgage Loans [Member], Excess MSRs Investees [Member])	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Percentage of Total Outstanding Unpaid Principal Amount	100.00%	100.00%
California [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Total Outstanding Unpaid Principal Amount	23.50%	23.50%
Florida [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Total Outstanding Unpaid Principal Amount	8.90%	9.20%
New York [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Total Outstanding Unpaid Principal Amount	5.60%	5.30%
Texas [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Total Outstanding Unpaid Principal Amount	4.80%	4.90%
Georgia [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Total Outstanding Unpaid Principal Amount	4.10%	4.00%
New Jersey [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Total Outstanding Unpaid Principal Amount	3.90%	3.70%
Illinois [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Total Outstanding Unpaid Principal Amount	3.50%	3.50%
Maryland [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Total Outstanding Unpaid Principal Amount	3.30%	3.10%
Virginia [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Total Outstanding Unpaid Principal Amount	3.20%	3.10%
Washington [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Total Outstanding Unpaid Principal Amount	2.80%	2.80%
Other U.S. [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Total Outstanding Unpaid Principal Amount	36.40%	36.90%