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Retirement Savings Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |
Employees' contributions at a rate | 3.00%vrts_DefinedContributionPlanMaximumEmployerMatchPercentageForFirstCompensationSlab |  |
Matching Contribution Percentage | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Employees' contributions at a rate | 2.00%vrts_DefinedContributionPlanMaximumEmployerMatchPercentageForNextCompensationSlab |  |
Matching Contribution Amount | $ 2.8 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 2.5 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 2.0 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Matching Contribution Percentage | 100.00%vrts_DefinedContributionPlanEmployerMatchPercentage |  |

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- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined contribution plan employer match percentage up to 3% of employee compensation. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Contribution Plan Maximum Employer Match Percentage For First Compensation Slab + References No definition available. + Details
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Namespace Prefix: | vrts_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Contribution Plan Maximum Employer Match Percentage For Next Compensation Slab + References No definition available. + Details
Name: | vrts_DefinedContributionPlanMaximumEmployerMatchPercentageForNextCompensationSlab
Namespace Prefix: | vrts_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration