INVESTMENTS IN CONSUMER LOANS - Narrative (Details) $ / shares in Units, shares in Millions			1 Months Ended	3 Months Ended								9 Months Ended	12 Months Ended
	Nov. 30, 2017 shares	Mar. 31, 2016 USD ($)	Feb. 28, 2017 USD ($) investor $ / shares shares	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Apr. 01, 2016	Mar. 30, 2016 USD ($)	Dec. 31, 2014 USD ($)	Apr. 30, 2013
Schedule of Consumer Loans [Line Items]
Basis in consumer loans investment																		$ 0
Interest income				$ 357,467,000	$ 397,722,000	$ 471,952,000	$ 292,538,000	$ 326,834,000	$ 282,388,000	$ 277,477,000	$ 190,036,000		$ 1,519,679,000	$ 1,076,735,000	$ 645,072,000
Income before income taxes				$ 346,945,000	$ 272,334,000	$ 420,247,000	$ 142,754,000	$ 262,781,000	$ 151,986,000	$ 101,145,000	$ 105,715,000		1,182,280,000	621,627,000	270,881,000
Payments to acquire loans held-for-investment													609,627,000	191,081,000	290,652,000
Consumer Loans
Schedule of Consumer Loans [Line Items]
Interest income													263,844,000	232,750,000	1,000
Income before income taxes													$ 132,394,000	161,529,000	$ 42,112,000
Operating Segments | Consumer Loans
Schedule of Consumer Loans [Line Items]
Interest income												$ 226,000,000
Income before income taxes												$ 82,000,000
WarrantCo | Consumer Portfolio Segment
Schedule of Consumer Loans [Line Items]
Number of warrants to be purchased (in shares) | shares			177.7
Value of Series F convertible preferred stock			$ 75,000,000
Exercise price (in dollars per share) | $ / shares			$ 0.01
SpringCastle | Parent Company
Schedule of Consumer Loans [Line Items]
Interest in Consumer Loans																53.50%
Consumer Loan Companies
Schedule of Consumer Loans [Line Items]
Total consideration		$ 237,500,000
Consideration transferred, percent of net assets used in gross purchase price		100.00%
Acquisition related costs incurred														$ 1,500,000
Consumer Loan Companies | Parent Company
Schedule of Consumer Loans [Line Items]
Total consideration		$ 237,500,000
OneMain - SpringCastle Sellers
Schedule of Consumer Loans [Line Items]
Percentage of portfolio co-invested by other parties																			47.00%
OneMain - SpringCastle Sellers | SpringCastle | SpringCastle Buyers
Schedule of Consumer Loans [Line Items]
Ownership percentage by noncontrolling owners		47.00%									47.00%
Total consideration		$ 111,600,000
OneMain - SpringCastle Sellers | SpringCastle | NRZ SpringCastle Buyers
Schedule of Consumer Loans [Line Items]
Percentage acquired		23.50%									23.50%
Voting interests acquired as a percentage of Gross Voting Interests Available for Sale		50.00%									50.00%
Blackstone Tactical Opportunities Advisors LLC
Schedule of Consumer Loans [Line Items]
Percentage of portfolio co-invested by other parties																			23.00%
Blackstone SpringCastle Buyers | SpringCastle
Schedule of Consumer Loans [Line Items]
Ownership percentage by noncontrolling owners																46.50%
Voting interests acquired as a percentage of Gross Voting Interests Available for Sale		50.00%									50.00%
Consumer Loan Companies
Schedule of Consumer Loans [Line Items]
New Residential’s ownership																			30.00%
Percentage of portfolio co-invested by other parties																			70.00%
Ownership percentage by noncontrolling owners				46.50%				46.50%				46.50%	46.50%	46.50%
Consumer Loan Companies | SpringCastle
Schedule of Consumer Loans [Line Items]
Ownership percentage by noncontrolling owners																	30.00%
Excess mortgage servicing rights, equity method investees, at fair value																	$ 71,300,000
LoanCo | Consumer Portfolio Segment
Schedule of Consumer Loans [Line Items]
New Residential’s ownership			25.00%
Purchase agreement amount			$ 5,000,000,000.0
Terms of purchase agreement contract			2 years
Recording lag			1 month
WarrantCo | Consumer Portfolio Segment
Schedule of Consumer Loans [Line Items]
New Residential’s ownership			23.57%
Number of co-investors | investor			3
Consumer Loan Seller | WarrantCo | Consumer Portfolio Segment
Schedule of Consumer Loans [Line Items]
Number of warrants owned (in shares) | shares	70.1
Performing Loans
Schedule of Consumer Loans [Line Items]
UPB of underlying mortgages								$ 177,400,000				$ 177,400,000		$ 177,400,000
Payments to acquire loans held-for-investment														176,200,000
Performing Loans | Consumer Portfolio Segment
Schedule of Consumer Loans [Line Items]
Payments to acquire loans held-for-investment														$ 176,107,000
Performing Loans | SpringCastle | Parent Company | Consumer Portfolio Segment
Schedule of Consumer Loans [Line Items]
Interest in Consumer Loans				53.50%				53.50%				53.50%	53.50%	53.50%