Name:	pfsi_LoanFulfillmentFeesReceivableFromAffiliate
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the net gains from the sale of mortgage loans and recapture expense incurred relating to mortgage loans subject to either MSRs or ESS owned by a related party that were refinanced by the Company.

No definition available.

Name:	pfsi_MortgageServicingRightsMSRsNetGainsFromSaleOfMortgageAndRecaptureRecognized
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the recapture expense incurred relating to mortgage loans subject to either MSRs or ESS owned by a related party that were refinanced by the Company.

No definition available.

Name:	pfsi_MortgageServicingRightsMSRsRecaptureRecognized
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the net gains from sale of mortgage loans to related party.

No definition available.

Name:	pfsi_NetGainsFromSaleOfMortgageLoansToRelatedParty
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

the administrative fee plus accrued interest and sourcing fee percent.

No definition available.

Name:	pfsi_RelatedPartyAdministrativeFeePlusAccruedInterestAndSourcingFeePercent
Namespace Prefix:	pfsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The renewal period that automatically renews at expiration, unless terminated earlier in accordance with the terms of the agreement, for the related party agreement.

No definition available.

Name:	pfsi_RelatedPartyTransactionAgreementTermAutomaticRenewalPeriod
Namespace Prefix:	pfsi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Fulfillment fee as a percentage of unpaid principal balance of all other mortgage loans, excluding Ginnie Mae.

No definition available.

Name:	pfsi_RelatedPartyTransactionFulfillmentFeeAsPercentageOfUnpaidPrincipalBalanceOfAllOtherMortgageLoansExcludingGinneMae
Namespace Prefix:	pfsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the the minimum unpaid principal balance of mortgage loans refinanced by the Company, for which a related party previously held the mortgage servicing rights, requiring the Company to transfer the mortgage servicing rights of the new loan to related party.

No definition available.

Name:	pfsi_RelatedPartyTransactionMinimumPercentOfTotalUpbOfMortgageLoansRefinancedByCompanyWhereRelatedPartyPreviouslyHeldMsrRequiringCompanyToTransferNewMsrToRelatedParty
Namespace Prefix:	pfsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	pfsi_RelatedPartyTransactionsLendingActivityAbstract
Namespace Prefix:	pfsi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents a fee paid to a related party relating to mortgage loans purchased from the related party through its correspondent lending activities.

No definition available.

Name:	pfsi_RelatedPartyTransactionsSourcingFeesPaid
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the tax service fee receivable from transactions with related parties.

No definition available.

Name:	pfsi_RelatedPartyTransactionsTaxServiceFeeReceivable
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the unpaid principal balance of loans fulfilled.

No definition available.

Name:	pfsi_RelatedPartyTransactionsUnpaidPrincipalBalanceOfLoansFulfilled
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents unpaid principal balance of loans purchased.

No definition available.

Name:	pfsi_RelatedPartyTransactionsUnpaidPrincipalBalanceOfLoansPurchased
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 16
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3337-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3461-108585

Name:	us-gaap_ProceedsFromSaleOfLoansHeldForSale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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.

No definition available.

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_MortgageBankingServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_MortgageServicingRightsRecaptureAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=pfsi_PennyMacMortgageInvestmentTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: