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Debt - Additional Information (Detail) (USD $) | 12 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Line of Credit Facility [Line Items] |  |  |
Term for credit facility | 5 years |  |
Outstanding under the Credit Facility | $ 0 us-gaap_LineOfCredit |  | $ 0 us-gaap_LineOfCredit
Letter of Credit [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Limit for the issuance of standby letters of credit | 7,500,000 us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases / us-gaap_ShortTermDebtTypeAxis = us-gaap_LetterOfCreditMember |  |
Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity | 75,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Credit facility amount increase in borrowing capacity on condition | 50,000,000 vrts_LineOfCreditFacilityIncreaseAdditionalBorrowingsOnConditionSatisfaction / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Repayment of debt |  | 15,000,000 us-gaap_RepaymentsOfDebt / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |
Remaining borrowing capacity | $ 75,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Credit facility interest periods | One, two, three or six months |  |
Minimum interest coverage ratio | At least 4.00:1 |  |
Minimum percentage of interest adjustment | 4.00 vrts_MinimumInterestCoverageRatioUnderCreditFacility / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Leverage ratio | No greater than 2.75:1 |  |
Maximum indebtedness to EBITDA | 2.75 vrts_MaximumLeverageRatio / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Percentage of margin on principal amount | 2.50%vrts_LineOfCreditFacilityBasisSpreadOnAlternateBaseRate / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Commitment fee | 0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Percentage of margin on principal amount | 0.75%vrts_LineOfCreditFacilityBasisSpreadOnAlternateBaseRate / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Commitment fee | 0.35%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Credit Facility Term + References No definition available. + Details
Name: | vrts_CreditFacilityTerm
Namespace Prefix: | vrts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Leverage Ratio Description + References No definition available. + Details
Name: | vrts_LeverageRatioDescription
Namespace Prefix: | vrts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line Of Credit Facility Basis Spread On Alternate Base Rate + References No definition available. + Details
Name: | vrts_LineOfCreditFacilityBasisSpreadOnAlternateBaseRate
Namespace Prefix: | vrts_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of Credit Facility Description of London Inter Bank Offered Rate + References No definition available. + Details
Name: | vrts_LineOfCreditFacilityDescriptionOfLondonInterBankOfferedRate
Namespace Prefix: | vrts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line Of Credit Facility Increase Additional Borrowings On Condition Satisfaction + References No definition available. + Details
Name: | vrts_LineOfCreditFacilityIncreaseAdditionalBorrowingsOnConditionSatisfaction
Namespace Prefix: | vrts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Maximum Leverage Ratio + References No definition available. + Details
Name: | vrts_MaximumLeverageRatio
Namespace Prefix: | vrts_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum Interest Coverage Ratio One + References No definition available. + Details
Name: | vrts_MinimumInterestCoverageRatioOne
Namespace Prefix: | vrts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum Interest Coverage Ratio Under Credit Facility + References No definition available. + Details
Name: | vrts_MinimumInterestCoverageRatioUnderCreditFacility
Namespace Prefix: | vrts_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |