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Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	May 11, 2015 MutualFund	Apr. 10, 2015
Subsequent Event [Line Items]
Number of open-end mutual funds	5vrts_NumberOfOpenEndMutualFunds
ETF Issuer Solutions [Member]
Subsequent Event [Line Items]
Investment to acquire majority interest		$ 4.8us-gaap_PaymentsToAcquireLimitedPartnershipInterests / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = vrts_EtfIssuerSolutionsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- Definition

Cash outflow related to the acquisition or continued holding of limited partnership interests held for investment purposes.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsToAcquireLimitedPartnershipInterests
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number Of Open End Mutual Funds

+ References

No definition available.

+ Details

Name:	vrts_NumberOfOpenEndMutualFunds
Namespace Prefix:	vrts_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration