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v2.4.1.9

Equity Transactions - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 49 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Sep. 30, 2013 | Dec. 10, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock, shares acquired |  |  |  | 225,441 us-gaap_TreasuryStockSharesAcquired | 105,000 us-gaap_TreasuryStockSharesAcquired | 575,441 us-gaap_TreasuryStockSharesAcquired |  |
Weighted average purchase price per share |  |  |  | $ 178.54 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 187.61 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 134.98 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |
Total cost of treasury shares acquired |  |  |  | $ 40,300,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 19,700,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 77,700,000 us-gaap_TreasuryStockValueAcquiredCostMethod |  |
Repurchased additional shares of common stock, shares |  |  |  |  |  |  |  | 500,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Common stock remaining authorized for repurchase | 624,559 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  |  | 624,559 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  | 624,559 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  |
Total cash dividends |  |  |  | 12,451,000 us-gaap_DividendsCommonStockCash | 0 us-gaap_DividendsCommonStockCash |  |  |
Cash dividends declared per share | $ 0.45 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.45 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.45 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.35 us-gaap_CommonStockDividendsPerShareDeclared |  |  |  |
Dividend, record date |  |  |  | Jan. 30, 2015 |  |  |  |
Dividend, to be paid date |  |  |  | Feb. 13, 2015 |  |  |  |
Dividends payable | 4,270,000 us-gaap_DividendsPayableCurrentAndNoncurrent |  |  | 4,270,000 us-gaap_DividendsPayableCurrentAndNoncurrent |  | 4,270,000 us-gaap_DividendsPayableCurrentAndNoncurrent |  |
Common stock value |  |  |  |  | 191,578,000 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |
Public Offering [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  | 1,300,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = vrts_PublicOfferingMember |
Common stock value |  |  |  |  |  |  | $ 191,800,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_SubsidiarySaleOfStockAxis = vrts_PublicOfferingMember |

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