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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

X

- Details

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