Related Party Transactions - Exchanged Private National Mortgage Acceptance Company, LLC Unitholders (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Transactions with Affiliates
Amount of tax benefits under the tax sharing agreement (as a percent)		85.00%
Payments to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement		$ (3,855,000)	$ (3,350,000)
Payable to exchanged PNMAC unitholders under tax receivable agreement	$ 26,700,000	26,700,000		$ 30,500,000
Private National Mortgage Acceptance Company [Member]
Transactions with Affiliates
Payment of tax liability under the tax receivable agreement to Private National Mortgage Acceptance Company, LLC unitholders	$ 340,000	$ 3,900,000	$ 3,400,000