Transactions with Related Parties - Summary of Loan Servicing Fees Earned and Mortgage Servicing Rights Recaptured Income Earned (Detail) - PennyMac Loan Services, LLC [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Related Party Transaction [Line Items]
Loan servicing fees	$ 20,264	$ 20,317	$ 40,526	$ 40,766
Average MSR portfolio unpaid principal balance	229,124,554	232,008,151	229,767,433	231,381,212
MSR recapture fees	473	509	826	994
UPB of loans recaptured	74,208	98,126	136,281	193,317
Loans acquired for sale at fair value [Member]
Related Party Transaction [Line Items]
Loan servicing fees	94	172	184	457
Average investment in loans acquired for sale at fair value	854,406	1,609,816	779,997	1,992,706
Loans at fair value [Member]
Related Party Transaction [Line Items]
Loan servicing fees	63	31	125	151
Loans at fair value	1,380,857	1,491,357	1,403,094	1,500,936
Mortgage servicing rights [Member]
Related Party Transaction [Line Items]
Loan servicing fees	$ 20,107	$ 20,114	$ 40,217	$ 40,158