INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS - Schedule of Activity Related to the Carrying Value of Investments in Excess MSRs (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Carrying Value of Investments in Excess MSRs
Beginning balance	$ 659,483
Ending balance	1,702,749
Excess MSRs
Carrying Value of Investments in Excess MSRs
Beginning balance	1,399,455
Purchases	0
Interest income	75,238
Other income	3,941
Proceeds from repayments	(195,694)
Change in fair value	(32,650)
Ocwen Transaction	(71,982)
Ending balance	1,178,308
Excess MSRs | Nationstar
Carrying Value of Investments in Excess MSRs
Beginning balance	611,293
Purchases	0
Interest income	33,837
Other income	1,948
Proceeds from repayments	(98,802)
Change in fair value	(6,442)
Ocwen Transaction	0
Ending balance	541,834
Excess MSRs | SLS
Carrying Value of Investments in Excess MSRs
Beginning balance	3,935
Purchases	0
Interest income	(255)
Other income	0
Proceeds from repayments	(1,215)
Change in fair value	381
Ocwen Transaction	0
Ending balance	2,846
Excess MSRs | Ocwen
Carrying Value of Investments in Excess MSRs
Beginning balance	784,227
Purchases	0
Interest income	41,656
Other income	1,993
Proceeds from repayments	(95,677)
Change in fair value	(26,589)
Ocwen Transaction	(71,982)
Ending balance	$ 633,628