INVESTMENTS IN SERVICER ADVANCES - Summary of Investments in Servicer Advances - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 17, 2013
Investments in and Advances to Affiliates [Line Items]
Carrying Value	$ 3,270,839		$ 2,665,551
Gross Loan-to-Value			101.40%	[1]
Servicer Advance Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items]
Carrying Value	3,270,839	[2]	2,665,551	[2]	3,200,000
Servicer Advance Joint Venture [Member] | Servicer Advances [Member]
Investments in and Advances to Affiliates [Line Items]
Unpaid Principal Balance (UPB) of Underlying Mortgages	96,547,773	[3]	43,444,216	[3]
Carrying Value	3,102,492	[3]	2,661,130	[3]
Servicer Advances to UPB of Underlying Residential Mortgage Loans	3.20%	[3]	6.10%	[3]
Carrying Value of Notes Payable	$ 2,890,230	[3]	$ 2,390,778	[3]
Gross Loan-to-Value	91.40%	[3]	89.80%	[3]
Net Loan-to-Value	90.40%	[3],[4]	88.60%	[3],[4]
Gross Cost of Funds	3.00%	[3],[5]	4.00%	[3],[5]
Net Cost of Funds	2.30%	[3],[5]	2.30%	[3],[5]

[1] LTV refers to the ratio comparing the loan’s unpaid principal balance to the value of the collateral property.

[2] Carrying value represents the fair value of the investments in servicer advances, including the basic fee component of the related MSRs.

[3] The following types of advances comprise the investments in servicer advances: December 31, 2014 December 31, 2013Principal and interest advances$729,713 $1,516,715Escrow advances (taxes and insurance advances)1,600,713 934,525Foreclosure advances772,066 209,890 Total$3,102,492 $2,661,130

[4] Ratio of face amount of borrowings to par amount of servicer advance collateral, net of an interest reserve maintained by the Buyer.

[5] Annualized measure of the cost associated with borrowings. Gross Cost of Funds primarily includes interest expense and facility fees. Net Cost of Funds excludes facility fees.