Mortgage Servicing - Schedule of Composition of Primary Servicing and Subservicing Portfolios by Type of Property Serviced as Measured by UPB (Footnote) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Servicing and Subservicing Portfolio [Line Items]
Servicing	$ 76,657,932	$ 72,378,693	$ 75,469,327
PHH Corporation | NRZ
Schedule of Servicing and Subservicing Portfolio [Line Items]
Servicing	$ 6,300,000	$ 51,300,000	$ 42,300,000