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Employee Benefits (Profit Sharing and 401k) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Profit sharing and 401(k) contributions for the periods |  |  |
Profit-sharing contributions, net | $ 0 | $ 0 | $ 13
Retirement plan matching contributions | $ 1,737 | $ 1,616 | $ 1,295

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Profit sharing contribution. + References No definition available. + Details
Name: | whg_ProfitSharingContribution
Namespace Prefix: | whg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration