INVESTMENTS IN MORTGAGE SERVICING RIGHTS - Schedule of Activity Related to the Carrying Value of Investments in MSRs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Schedule of MSRs [Line Items]
Beginning balance	$ 0
Amortization of servicing rights	(15,354)
Change in valuation inputs and assumptions	103,679
Ending balance	659,483
MSRs [Member]
Schedule of MSRs [Line Items]
Beginning balance	0
Purchases	571,158
Amortization of servicing rights	(15,354)	[1]
Change in valuation inputs and assumptions	103,679
Ending balance	659,483
MSRs [Member] | Ditech Financial LLC [Member]
Schedule of MSRs [Line Items]
Beginning balance	0
Purchases	482,102
Amortization of servicing rights	(13,895)	[1]
Change in valuation inputs and assumptions	77,804
Ending balance	546,011
MSRs [Member] | FirstKey Mortgage, LLC [Member]
Schedule of MSRs [Line Items]
Beginning balance	0
Purchases	89,056
Amortization of servicing rights	(1,459)	[1]
Change in valuation inputs and assumptions	25,875
Ending balance	$ 113,472

[1] Based on the ratio of the current UPB of the underlying residential mortgage loans relative to the original UPB of the underlying residential mortgage loans.