Rights to MSRs - Schedule of Assets, Liabilities, Servicing and Subservicing Fees Related to NRZ Agreements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Servicing Liabilities at Fair Value [Line Items]
Mortgage servicing rights, at fair value		$ 1,486,395	$ 1,457,149	$ 671,962	$ 679,256
Sales and transfers of MSRs		24,167	23,757
Due to NRZ		63,596	53,001
Other financing liabilities		972,595	1,062,090
Changes in fair value		(152,986)	19,269	(41,282)
Other		2,435	2,850	1,796
Pledged MSR liability expense		372,089	171,670	236,311
NRZ
Servicing Liabilities at Fair Value [Line Items]
Mortgage servicing rights, at fair value		915,100	894,002	499,042
Sales and transfers of MSRs		33,364	54,602	14,924
Due to NRZ		63,596	53,001	98,493
Servicing fees collected on behalf of NRZ		577,015	539,039	549,411
Less: Subservicing fee retained		139,300	142,334	295,192
Net servicing fees remitted to NRZ		437,700	396,705	254,219
Changes in fair value		152,986	(19,269)	41,282
Runoff, settlement and other		214,363	211,766	59,190
Other		4,206
Other			(6,000)	0
Pledged MSR liability expense		372,089	171,670	236,311
NRZ | Original Rights to MSRs Agreements
Servicing Liabilities at Fair Value [Line Items]
Changes in fair value		229,198	(171)	83,300
Runoff, settlement and other		48,729	58,837	57,264
NRZ | 2017 Agreements and New RMSR Agreements
Servicing Liabilities at Fair Value [Line Items]
Changes in fair value		5,866	(14,369)	(42,018)
Runoff, settlement and other		101,003	134,509	1,926
NRZ | PHH MSR Agreements
Servicing Liabilities at Fair Value [Line Items]
Changes in fair value		(82,078)	(4,729)	0
Runoff, settlement and other		64,631	18,420	0
Sale and Transfers of Mortgage Servicing Rights | NRZ
Servicing Liabilities at Fair Value [Line Items]
Sales and transfers of MSRs		24,167	23,757	0
Advance Funding, Subservicing Fees and Reimbursable Expenses | NRZ
Servicing Liabilities at Fair Value [Line Items]
Sales and transfers of MSRs		9,197	30,845	14,924
Original Rights to MSRs Agreements | NRZ
Servicing Liabilities at Fair Value [Line Items]
Other financing liabilities		603,046	436,511	499,042
2017 Agreements and New RMSR Agreements | NRZ
Servicing Liabilities at Fair Value [Line Items]
Other financing liabilities		35,400	138,854	9,249
PHH MSR Agreements | NRZ
Servicing Liabilities at Fair Value [Line Items]
Other financing liabilities		312,102	457,491	0
Financing Liability - MSRs Pledged
Servicing Liabilities at Fair Value [Line Items]
Other financing liabilities		$ 950,593	$ 1,032,856	$ 508,291
Forecast
Servicing Liabilities at Fair Value [Line Items]
Runoff, settlement and other	$ 35,400