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Related Party Transactions - Schedule of Estimated Payments Under Tax Receivable Agreement (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
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Related Party Transactions [Abstract] |  |
Remainder of 2026 | $ 2,460 |
2027 | 4,373 |
2028 | 5,830 |
2029 | 6,041 |
2030 | 6,173 |
Thereafter | 80,748 |
Total payments | $ 105,625 | $ 93,461

X
- Definition Amount due pursuant to tax receivable agreement. + References No definition available. + Details
Name: | pwp_AmountDuePursuantToTaxReceivableAgreement
Namespace Prefix: | pwp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of estimated payments pursuant to the tax receivable agreement due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | pwp_EstimatedPaymentsUnderTaxReceivableAgreementAfterYearFour
Namespace Prefix: | pwp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of estimated payments pursuant to the tax receivable agreement to be paid in remainder of current fiscal year. + References No definition available. + Details
Name: | pwp_EstimatedPaymentsUnderTaxReceivableAgreementRemainderOfFiscalYear
Namespace Prefix: | pwp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of estimated payments pursuant to the tax receivable agreement to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearFour
Namespace Prefix: | pwp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of estimated payments pursuant to the tax receivable agreement to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearOne
Namespace Prefix: | pwp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of estimated payments pursuant to the tax receivable agreement to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearThree
Namespace Prefix: | pwp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of estimated payments pursuant to the tax receivable agreement to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearTwo
Namespace Prefix: | pwp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration