Transactions with Related Parties - Loan Servicing - Additional Information (Detail) - PennyMac Loan Services, LLC [Member]	9 Months Ended
Sep. 30, 2024
Mortgage Loans On Real Estate [Line Items]
Servicing agreement expiration date	Jun. 30, 2025
Service agreement maturity renewal term	18 months

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 29
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1

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Balance Type:	na
Period Type:	duration