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Redeemable Noncontrolling Interests - Narrative (Details) | 9 Months Ended
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Sep. 30, 2018
Minimum |
Noncontrolling Interest [Line Items] |
Exercise period | 4 years
Maximum |
Noncontrolling Interest [Line Items] |
Exercise period | 7 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_MinorityInterestLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Redeemable Noncontrolling Interest, Exercise Period + References No definition available. + Details
Name: | vrts_RedeemableNoncontrollingInterestExercisePeriod
Namespace Prefix: | vrts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |