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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Segment | Dec. 31, 2013 | Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items] |  |  |
Investment management fees | $ 1.6 vrts_InvestmentManagementFeesRevenue | $ 1.7 vrts_InvestmentManagementFeesRevenue | $ 2.5 vrts_InvestmentManagementFeesRevenue
Number of operating segment | 1 us-gaap_NumberOfOperatingSegments |  |
Management fees net of fees paid | $ 124.4 vrts_InvestmentManagementFeesPaid | $ 96.1 vrts_InvestmentManagementFeesPaid | $ 53.7 vrts_InvestmentManagementFeesPaid
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred sales charges receiving period | 1 year |  |
Deferred commissions amortization period | 1 year |  |
Estimated useful lives of intangibles | 1 year |  |
Minimum [Member] | Furniture and Office Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of fixed assets | 3 years |  |
Minimum [Member] | Computer Equipment and Software [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of fixed assets | 3 years |  |
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred sales charges receiving period | 5 years |  |
Deferred commissions amortization period | 5 years |  |
Estimated useful lives of intangibles | 16 years |  |
Maximum [Member] | Furniture and Office Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of fixed assets | 7 years |  |
Maximum [Member] | Computer Equipment and Software [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of fixed assets | 5 years |  |

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Commission Recovery Period + References No definition available. + Details
Name: | vrts_DeferredCommissionRecoveryPeriod
Namespace Prefix: | vrts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Sales Commissions Amortization Period + References No definition available. + Details
Name: | vrts_DeferredSalesCommissionsAmortizationPeriod
Namespace Prefix: | vrts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investment Management Fees Paid + References No definition available. + Details
Name: | vrts_InvestmentManagementFeesPaid
Namespace Prefix: | vrts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Investment Management Fees Revenue + References No definition available. + Details
Name: | vrts_InvestmentManagementFeesRevenue
Namespace Prefix: | vrts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | vrts_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | vrts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |