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Long-Term Incentive Compensation (Details) (Restricted Stock, USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total stock based compensation expense $ 3,678us-gaap_AllocatedShareBasedCompensationExpense $ 3,479us-gaap_AllocatedShareBasedCompensationExpense
Service Condition Stock Based Compensation Expense | The Plan
    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total stock based compensation expense 2,183us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= whg_StockBasedCompensationExpenseSubjectToServiceConditionMember
/ us-gaap_PlanNameAxis
= whg_ThePlanMember		 1,814us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= whg_StockBasedCompensationExpenseSubjectToServiceConditionMember
/ us-gaap_PlanNameAxis
= whg_ThePlanMember
Performance Condition Stock Based Compensation Expense | The Plan
    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total stock based compensation expense 1,354us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= whg_StockBasedCompensationExpenseSubjectToPerformanceConditionMember
/ us-gaap_PlanNameAxis
= whg_ThePlanMember		 1,249us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= whg_StockBasedCompensationExpenseSubjectToPerformanceConditionMember
/ us-gaap_PlanNameAxis
= whg_ThePlanMember
Stock Based Compensation Expense | The Plan
    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total stock based compensation expense 3,537us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= whg_StockBasedCompensationExpenseMember
/ us-gaap_PlanNameAxis
= whg_ThePlanMember		 3,063us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= whg_StockBasedCompensationExpenseMember
/ us-gaap_PlanNameAxis
= whg_ThePlanMember
Canadian Plan Stock Based Compensation Expense | Canada EB Plan
    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total stock based compensation expense $ 141us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= whg_CanadianPlanStockBasedCompensationExpenseMember
/ us-gaap_PlanNameAxis
= whg_CanadaEBPlanMember		 $ 416us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= whg_CanadianPlanStockBasedCompensationExpenseMember
/ us-gaap_PlanNameAxis
= whg_CanadaEBPlanMember