INVESTMENTS IN SERVICER ADVANCES - Summary of Investments in Servicer Advances - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Investments in and Advances to Affiliates [Line Items]
Carrying Value	$ 3,245,457		$ 3,270,839
Servicer Advance Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items]
Carrying Value	3,245,457	[1]	3,270,839	[1]
Servicer Advance Joint Venture [Member] | Servicer Advances [Member]
Investments in and Advances to Affiliates [Line Items]
Unpaid Principal Balance (“UPB”) of Underlying Mortgages	92,159,246	[2]	96,547,773	[2]
Carrying Value	3,068,306	[2]	3,102,492	[2]
Servicer Advances to UPB of Underlying Residential Mortgage Loans	3.30%	[2]	3.20%	[2]
Carrying Value of Notes Payable	$ 2,875,412	[2]	$ 2,890,230	[2]
Gross Loan-to-Value	91.50%	[2]	91.40%	[2]
Net Loan-to-Value	90.60%	[2],[3]	90.40%	[2],[3]
Gross Cost of Funds	2.60%	[2],[4]	3.00%	[2],[4]
Net Cost of Funds	2.20%	[2],[4]	2.30%	[2],[4]

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

[2] The following types of advances comprise the investments in servicer advances: March 31, 2015December 31, 2014Principal and interest advances$737,845$729,713Escrow advances (taxes and insurance advances)1,514,8481,600,713Foreclosure advances815,613772,066 Total$3,068,306$3,102,492

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

[4] 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.