INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS, EQUITY METHOD INVESTEES - Summary of the Financial Results of Excess MSR Joint Ventures, Accounted for as Equity Method Investees - Roll Forward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Beginning balance	$ 352,766
Change in fair value of investments in equity method investees	57,280	50,343	0
Ending balance	330,876	352,766
Recurring Basis [Member] | Level 3 [Member]
Schedule of Equity Method Investments [Line Items]
Beginning balance	352,766	0
Contributions to equity method investees	0	358,864
Distributions of earnings from equity method investees	(53,427)	(33,189)
Distributions of capital from equity method investees	(25,743)	(23,252)
Change in fair value of investments in equity method investees	57,280	50,343
Ending balance	$ 330,876	$ 352,766