INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Summary of Real Estate Securities in an Unrealized Loss Position - Associated Intent to Sell (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Securities New Residential intends to sell
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 25,526	$ 0
Amortized Cost Basis After Credit Impairment	25,526	0
Gross Unrealized Losses, Credit	(4,797)	0
Gross Unrealized Losses, Non-Credit		0
Securities New Residential is more likely than not to be required to sell
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Amortized Cost Basis After Credit Impairment	0	0
Gross Unrealized Losses, Credit	0	0
Credit impaired securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	114,835	228,228
Amortized Cost Basis After Credit Impairment	120,530	237,626
Gross Unrealized Losses, Credit	(14,218)	(3,232)
Gross Unrealized Losses, Non-Credit	(5,695)	(9,398)
Non-credit impaired securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	831,259	4,726,409
Amortized Cost Basis After Credit Impairment	937,099	4,767,837
Gross Unrealized Losses, Credit	0	0
Gross Unrealized Losses, Non-Credit	(105,840)	(41,428)
Total debt securities in an unrealized loss position
Debt Securities, Available-for-sale [Line Items]
Fair Value	971,620	4,954,637
Amortized Cost Basis After Credit Impairment	1,083,155	5,005,463
Gross Unrealized Losses, Credit	(19,015)	(3,232)
Gross Unrealized Losses, Non-Credit	$ (111,535)	$ (50,826)