Significant Accounting Policies - Additional Information (Details)		1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 30, 2016 USD ($)	Feb. 09, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) class reporting_unit	Dec. 31, 2017 USD ($)	Feb. 01, 2017 USD ($)
Significant Accounting Policy Disclosures [Line Items]
Number of days to settle transactions				3 days
Cash In process of settlement			$ 78,000,000	$ 78,000,000	$ 85,700,000
Ginnie Mae loans delinquency threshold for unilateral right to repurchase loans				90 days
Minimum period after which residential loans are placed on non-accrual status			90 days	90 days
Gain or loss recognized on transfers of reverse loans				$ 0
Percentage of maximum claim amount, repurchase threshold			98.00%	98.00%
Number of classes of servicing riights | class				3
Borrower escrow funds and other custodial funds due to credit owners			$ 3,000,000,000	$ 3,000,000,000	3,400,000,000
Number of reporting units | reporting_unit				3
Advertising expense		$ 2,000,000	$ 12,500,000		$ 16,000,000
GTI Holdings Corp. [Member]
Significant Accounting Policy Disclosures [Line Items]
Percentage of equity sold	100.00%
Purchase price	$ 125,000,000
Potential earnout payments	$ 25,000,000
Consideration received						$ 131,100,000