EXCESS MORTGAGE SERVICING RIGHTS ASSETS - Summary of Financial Results of Excess MSR Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investments in Mortgage Servicing Rights [Line Items]
Total equity	$ 5,621,813	$ 5,330,464	$ 5,429,684	$ 7,236,260
New Residential’s investment	5,045,339		4,585,841
Net income (loss)	301,336	(1,607,255)
Excess MSRs Investees
Schedule of Investments in Mortgage Servicing Rights [Line Items]
Excess MSR assets	177,408		179,762
Other assets	21,051		20,759
New Residential’s investment	$ 98,886		$ 99,917
New Residential’s percentage ownership	50.00%		50.00%
Interest income	$ 9,158	7,313
Other income (loss)	(2,820)	(8,219)
Expenses	(8)	(8)
Excess MSRs Investees | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Investments in Mortgage Servicing Rights [Line Items]
Other liabilities	(687)		$ (687)
Total equity	197,772		199,834
Net income (loss)	6,330	$ (914)
MSRs
Schedule of Investments in Mortgage Servicing Rights [Line Items]
New Residential’s investment	$ 4,023,559		$ 3,489,675