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Related Party Transactions (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
UCITS Fund      
Related Party Transaction [Line Items]      
Fees earned from related party $ 346,000us-gaap_RevenueFromRelatedParties
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember
$ 36,000us-gaap_RevenueFromRelatedParties
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember
 
Fees unpaid from related party 120,000us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember
  256,000us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember
Trust      
Related Party Transaction [Line Items]      
Fees earned from related party 74,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_TrustForBenefitOfEmployeesMember
59,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_TrustForBenefitOfEmployeesMember
 
Due from related party $ 0us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_TrustForBenefitOfEmployeesMember
  $ 0us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_TrustForBenefitOfEmployeesMember