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Fair Value Measurements (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2012
Fair Value Measurements (Textual) [Abstract] |  |
Fair Value, Equity, Level 1 to Level 2 Transfers, Amount | $ 0 | $ 0
Fair Value, Equity, Level 2 to Level 1 Transfers, Amount | $ 0 | $ 0

X
- Definition Fair value assets level 1 to level 2 transfer amount. + References No definition available. + Details
Name: | vrts_FairValueAssetsLevelOneToLevelTwoTransferAmount
Namespace Prefix: | vrts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair Value assets level 2 to level 1 transfer amount. + References No definition available. + Details
Name: | vrts_FairValueAssetsLevelTwoToLevelOneTransferAmount
Namespace Prefix: | vrts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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