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Rights to MSRs - Schedule of Assets, Liabilities, Servicing and Subservicing Fees Related to NRZ Agreements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Servicing Liabilities at Fair Value [Line Items]
MSRs, at fair value	$ 1,400,217	$ 1,050,228	$ 1,294,817	$ 1,486,395
Due from NRZ	11,653		4,611
Other financing liabilities, at fair value	559,184		576,722
Interest expense	37,850	6,594
PMC MSR Agreements
Servicing Liabilities at Fair Value [Line Items]
Changes in fair value	0	40,720
Runoff and settlement	0	7,492
New Residential Investment Corp
Servicing Liabilities at Fair Value [Line Items]
MSRs, at fair value	550,364		566,952
Due to NRZ	94,535		94,691
Servicing fees collected on behalf of NRZ	80,385	119,669
Less: Subservicing fee retained by Ocwen	23,991	29,331
Net servicing fees remitted to NRZ	56,394	90,338
Changes in fair value	(1,551)	32,749
Runoff and settlement	17,616	48,375
Other	2,479	2,620
Interest expense	37,850	6,594
New Residential Investment Corp \| Subservicing Fees and Reimbursable Expenses
Servicing Liabilities at Fair Value [Line Items]
Due from NRZ	11,653		4,611
New Residential Investment Corp \| Original Rights to MSRs Agreements
Servicing Liabilities at Fair Value [Line Items]
Other financing liabilities, at fair value	550,364		$ 566,952
Changes in fair value	(1,551)	(7,068)
Runoff and settlement	17,616	15,741
New Residential Investment Corp \| Original Rights to MSRs Agreements \| Reclassification
Servicing Liabilities at Fair Value [Line Items]
Changes in fair value		2,000
New Residential Investment Corp \| 2017 Agreements and New RMSR Agreements
Servicing Liabilities at Fair Value [Line Items]
Changes in fair value	0	(903)
Runoff and settlement	$ 0	$ 25,142