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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Reconciliation [Line Items] |  |  |
Estimated effective income tax rate | 29.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 37.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 42.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective tax rate impacted by net tax benefit | $ 15,505,000 us-gaap_IncomeTaxReconciliationTaxSettlementsDomestic |  |
Recognized tax benefit from uncertain tax positions | 31,000,000 us-gaap_LiabilityForUncertainTaxPositionsCurrent |  |
Reduction on deferred tax assets | 15,500,000 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes |  |
Valuation allowance | (2,397,000)us-gaap_DeferredTaxAssetsValuationAllowance | (35,000)us-gaap_DeferredTaxAssetsValuationAllowance | (1,600,000)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets related to net operating losses for federal income tax purposes | 21,547,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 23,705,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Ownership percentage | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  |
Percentage increasing ownership | 5.00%vrts_PercentageOfChangeInOwnership |  |
Pre-tax net operating loss carryovers | 66,500,000 us-gaap_OperatingLossCarryforwards |  |
Built-in losses annual limitation | 4,200,000 vrts_BuiltInLossesAnnualLimitation |  |
Reduced unrecognized tax benefits | 32,602,000 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | 1,346,000 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | 191,000 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Net of federal benefit | 31,000,000 vrts_UnrecognizedTaxBenefitsNet |  |
Interest or penalties related to uncertain tax positions | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Recognized tax benefits | 39,349,000 us-gaap_IncomeTaxExpenseBenefit | 44,778,000 us-gaap_IncomeTaxExpenseBenefit | 27,030,000 us-gaap_IncomeTaxExpenseBenefit
Connecticut [Member] |  |  |
Income Tax Reconciliation [Line Items] |  |  |
Open tax year | 2001 |  |
New York [Member] |  |  |
Income Tax Reconciliation [Line Items] |  |  |
Open tax year | 2000 |  |
Tax Year 2011 [Member] |  |  |
Income Tax Reconciliation [Line Items] |  |  |
Decrease in net operating loss carry-forwards | 15,500,000 vrts_IncreaseDecreaseInNetOperatingLossCarryForwards / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2011Member |  |
Domestic Tax Authority [Member] |  |  |
Income Tax Reconciliation [Line Items] |  |  |
Deferred tax assets related to net operating losses for federal income tax purposes | 41,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |
Domestic Tax Authority [Member] | Minimum [Member] |  |  |
Income Tax Reconciliation [Line Items] |  |  |
Operating loss carry-forwards, expiration beginning year | 2029 |  |
State and Local Jurisdiction [Member] |  |  |
Income Tax Reconciliation [Line Items] |  |  |
Deferred tax assets related to net operating losses for federal income tax purposes | 7,200,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
State and Local Jurisdiction [Member] | Minimum [Member] |  |  |
Income Tax Reconciliation [Line Items] |  |  |
Operating loss carry-forwards, expiration beginning year | 2016 |  |
Stock-based Incentive Plans [Member] |  |  |
Income Tax Reconciliation [Line Items] |  |  |
Recognized tax benefits | $ 24,800,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |  |

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