Earnings per Share - Additional Information (Detail)	3 Months Ended	6 Months Ended
Jun. 30, 2013 Instruments	Jun. 30, 2012 Instruments	Jun. 30, 2013 Instruments	Jun. 30, 2012 Instruments
Earnings Per Share [Abstract]
Number of anti-dilutive instruments excluded from computation of weighted average shares for diluted EPS	0	0	0	0

Number Of Antidilutive Securities Excluded From Computation Of Earnings Per Share

No definition available.

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