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Consolidated Sponsored Investment Products - Reconciliation of Assets Related to Consolidated Sponsored Investment Products (Detail) (Debt Securities [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Debt Securities [Member]
  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
Purchases 1,119us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
Sales 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
Paydowns (3)vrts_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsPaydowns
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
Change in unrealized gain/loss (51)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
Ending balance $ 1,065us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember