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Income Taxes - Summary of Tax Effects of Temporary Differences (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Deferred tax assets: |  |  |
Intangible assets | $ 36,340 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets | $ 43,827 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets |
Net operating losses | 21,547 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 23,705 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Compensation accruals | 6,757 us-gaap_DeferredTaxAssetsTaxDeferredExpense | 6,280 us-gaap_DeferredTaxAssetsTaxDeferredExpense |
Investments | 8,717 us-gaap_DeferredTaxAssetsInvestments | 5,111 us-gaap_DeferredTaxAssetsInvestments |
Unrealized loss/(gain) | 2,362 vrts_DeferredTaxAssetsUnrealizedGainLoss | (2,357)vrts_DeferredTaxAssetsUnrealizedGainLoss |
Other | 46 us-gaap_DeferredTaxAssetsOther | 1,581 us-gaap_DeferredTaxAssetsOther |
Gross deferred tax assets | 75,769 us-gaap_DeferredTaxAssetsGross | 78,147 us-gaap_DeferredTaxAssetsGross |
Valuation allowance | (2,397)us-gaap_DeferredTaxAssetsValuationAllowance | (35)us-gaap_DeferredTaxAssetsValuationAllowance | (1,600)us-gaap_DeferredTaxAssetsValuationAllowance
Gross deferred tax assets after valuation allowance | 73,372 us-gaap_DeferredTaxAssetsNet | 78,112 us-gaap_DeferredTaxAssetsNet |
Deferred tax liabilities: |  |  |
Intangible assets | (12,718)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets | (13,078)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets |
Other investments | (492)us-gaap_DeferredTaxLiabilitiesInvestments | (534)us-gaap_DeferredTaxLiabilitiesInvestments |
Gross deferred tax liabilities | (13,210)us-gaap_DeferredIncomeTaxLiabilities | (13,612)us-gaap_DeferredIncomeTaxLiabilities |
Deferred tax assets, net | $ 60,162 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 64,500 us-gaap_DeferredTaxAssetsLiabilitiesNet |

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