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Consolidated Sponsored Investment Products - Consolidated Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues | $ 112,137 us-gaap_Revenues | $ 117,841 us-gaap_Revenues | $ 112,749 us-gaap_Revenues | $ 107,871 us-gaap_Revenues | $ 106,498 us-gaap_Revenues | $ 100,409 us-gaap_Revenues | $ 96,140 us-gaap_Revenues | $ 86,168 us-gaap_Revenues | $ 450,598 us-gaap_Revenues | $ 389,215 us-gaap_Revenues | $ 280,086 us-gaap_Revenues
Total operating expenses |  |  |  |  |  |  |  |  | 319,878 us-gaap_OperatingExpenses | 275,711 us-gaap_OperatingExpenses | 219,641 us-gaap_OperatingExpenses
Operating income (loss) | 36,665 us-gaap_OperatingIncomeLoss | 38,927 us-gaap_OperatingIncomeLoss | 22,502 us-gaap_OperatingIncomeLoss | 32,626 us-gaap_OperatingIncomeLoss | 33,892 us-gaap_OperatingIncomeLoss | 31,630 us-gaap_OperatingIncomeLoss | 26,882 us-gaap_OperatingIncomeLoss | 21,100 us-gaap_OperatingIncomeLoss | 130,720 us-gaap_OperatingIncomeLoss | 113,504 us-gaap_OperatingIncomeLoss | 60,445 us-gaap_OperatingIncomeLoss
Total other non-operating income (expense) |  |  |  |  |  |  |  |  | 5,594 vrts_OtherNonoperatingIncomeExpenses | 8,404 vrts_OtherNonoperatingIncomeExpenses | 4,358 vrts_OtherNonoperatingIncomeExpenses
Income Before Income Taxes |  |  |  |  |  |  |  |  | 136,314 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 121,908 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 64,803 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense |  |  |  |  |  |  |  |  | 39,349 us-gaap_IncomeTaxExpenseBenefit | 44,778 us-gaap_IncomeTaxExpenseBenefit | 27,030 us-gaap_IncomeTaxExpenseBenefit
Net income (loss) |  |  |  |  |  |  |  |  | 96,965 us-gaap_NetIncomeLoss | 77,130 us-gaap_NetIncomeLoss | 37,773 us-gaap_NetIncomeLoss
Noncontrolling interests |  |  |  |  |  |  |  |  | 735 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | (1,940)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | (101)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity
Allocation of earnings to preferred stockholders |  |  |  |  |  |  |  |  | 0 us-gaap_PreferredStockDividendsAndOtherAdjustments |  | (64)us-gaap_PreferredStockDividendsAndOtherAdjustments
Net income (loss) attributable to the Company | 18,879 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 37,340 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 19,543 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 21,938 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 24,756 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 21,089 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 15,385 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 13,960 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 97,700 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 75,190 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 37,608 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Reportable Legal Entities [Member] | Balance Before Consolidation of Investment Products [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 451,259 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 389,202 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 279,919 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total operating expenses |  |  |  |  |  |  |  |  | 316,840 us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 274,913 us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 219,326 us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating income (loss) |  |  |  |  |  |  |  |  | 134,419 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 114,289 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 60,593 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total other non-operating income (expense) |  |  |  |  |  |  |  |  | 2,502 vrts_OtherNonoperatingIncomeExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,620 vrts_OtherNonoperatingIncomeExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,106 vrts_OtherNonoperatingIncomeExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Before Income Taxes |  |  |  |  |  |  |  |  | 136,921 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 119,909 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 64,699 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax expense |  |  |  |  |  |  |  |  | 39,349 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 44,778 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 27,030 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss) |  |  |  |  |  |  |  |  | 97,572 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 75,131 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 37,669 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Noncontrolling interests |  |  |  |  |  |  |  |  | 128 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 59 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Allocation of earnings to preferred stockholders |  |  |  |  |  |  |  |  |  |  | (64)us-gaap_PreferredStockDividendsAndOtherAdjustments / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss) attributable to the Company |  |  |  |  |  |  |  |  | 97,700 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 75,190 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 37,608 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Reportable Legal Entities [Member] | Consolidated Sponsored Investment Products [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Total operating expenses |  |  |  |  |  |  |  |  | 3,699 us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 785 us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 148 us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Operating income (loss) |  |  |  |  |  |  |  |  | (3,699)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (785)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (148)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Total other non-operating income (expense) |  |  |  |  |  |  |  |  | 2,619 vrts_OtherNonoperatingIncomeExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 6,098 vrts_OtherNonoperatingIncomeExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,649 vrts_OtherNonoperatingIncomeExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income Before Income Taxes |  |  |  |  |  |  |  |  | (1,080)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 5,313 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,501 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income tax expense |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Net income (loss) |  |  |  |  |  |  |  |  | (1,080)us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 5,313 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,501 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Noncontrolling interests |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Net income (loss) attributable to the Company |  |  |  |  |  |  |  |  | (1,080)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 5,313 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,501 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Eliminations and Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | (661)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 13 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 167 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Total operating expenses |  |  |  |  |  |  |  |  | (661)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 13 us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 167 us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Operating income (loss) |  |  |  |  |  |  |  |  | 0 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Total other non-operating income (expense) |  |  |  |  |  |  |  |  | 473 vrts_OtherNonoperatingIncomeExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (3,314)vrts_OtherNonoperatingIncomeExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (2,397)vrts_OtherNonoperatingIncomeExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Income Before Income Taxes |  |  |  |  |  |  |  |  | 473 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (3,314)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (2,397)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Income tax expense |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Net income (loss) |  |  |  |  |  |  |  |  | 473 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (3,314)us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (2,397)us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Noncontrolling interests |  |  |  |  |  |  |  |  | 607 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (1,999)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (104)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember
Net income (loss) attributable to the Company |  |  |  |  |  |  |  |  | $ 1,080 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | $ (5,313)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | $ (2,501)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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