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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Currently payable:      
Federal $ 161,863us-gaap_CurrentFederalTaxExpenseBenefit $ 131,000us-gaap_CurrentFederalTaxExpenseBenefit $ 104,922us-gaap_CurrentFederalTaxExpenseBenefit
State 14,206us-gaap_CurrentStateAndLocalTaxExpenseBenefit 12,197us-gaap_CurrentStateAndLocalTaxExpenseBenefit 9,335us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 35us-gaap_CurrentForeignTaxExpenseBenefit 37us-gaap_CurrentForeignTaxExpenseBenefit  
Total currently payable 176,104us-gaap_CurrentIncomeTaxExpenseBenefit 143,234us-gaap_CurrentIncomeTaxExpenseBenefit 114,257us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred taxes 728wdr_DeferredIncomeTaxNoncashExpenseBenefit (3,001)wdr_DeferredIncomeTaxNoncashExpenseBenefit (5,782)wdr_DeferredIncomeTaxNoncashExpenseBenefit
Provision for income taxes $ 176,832us-gaap_IncomeTaxExpenseBenefit $ 140,233us-gaap_IncomeTaxExpenseBenefit $ 108,475us-gaap_IncomeTaxExpenseBenefit
Reconciliation of statutory federal income tax rate with the entity's effective income tax rate      
Statutory federal income tax rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal tax benefits (as a percent) 2.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
State tax incentives (as a percent) (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Valuation allowance on losses capital in nature (as a percent) (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other items (as a percent) 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate (as a percent) 36.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 36.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations