Organization, Business Environment, Basis of Presentation and Significant Accounting Policies - Schedule of Reclassifications of Prior Period Amounts to Confirm with Current Period Presentation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Prior Period Adjustments Restatement [Line Items]
Loss on valuation of MSRs, at fair value	$ 93,953	$ 5,853	$ 86,964
Servicing and subservicing fees	(975,507)	(937,083)	(991,597)
Amortization of MSRs	$ 372,089	171,670	236,311
Previously Reported | Servicing and Origination Expense
Prior Period Adjustments Restatement [Line Items]
Impairment charge (reversal) on MSRs		40,407	46,219
Loss on valuation of MSRs, at fair value		22,577	31,517
Servicing and subservicing fees		(2,747)	(2,221)
Previously Reported | Expense
Prior Period Adjustments Restatement [Line Items]
Amortization of MSRs		$ 60,237	$ 75,515