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v2.4.1.9

Stockholder's Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 25 Months Ended |
--- | --- | --- | --- | ---
Mar. 01, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 10, 2012
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Common stock, shares authorized |  | 100,000,000 us-gaap_CommonStockSharesAuthorized | 100,000,000 us-gaap_CommonStockSharesAuthorized | 100,000,000 us-gaap_CommonStockSharesAuthorized |
Common stock, par value |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |
Preferred stock, shares authorized |  | 40,000,000 us-gaap_PreferredStockSharesAuthorized |  | 40,000,000 us-gaap_PreferredStockSharesAuthorized |
Preferred stock, par value |  | $ 1 us-gaap_PreferredStockParOrStatedValuePerShare |  | $ 1 us-gaap_PreferredStockParOrStatedValuePerShare |
Unissued common stock reserved for stock - based incentive plans and convertible preferred stock issuance |  | 6,300,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  | 6,300,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |
Sale of preferred stock | 2,587,400 us-gaap_PreferredStockSharesIssued |  |  |  |
Convertible preferred stock dividend, rate | 6.25%us-gaap_PreferredStockDividendRatePercentage |  |  |  |
Conversion rate of preferred stock | 6,912,756 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion |  |  |  |
Convertible preferred stock, conversion date | Mar. 01, 2014 |  |  |  |
Common stock repurchased, shares |  |  |  | 2,200,000 us-gaap_TreasuryStockSharesAcquired |
Common stock repurchased, value |  | $ 35.7 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 11.7 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 47.3 us-gaap_TreasuryStockValueAcquiredCostMethod |
Board of Directors | Maximum |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Common stock repurchase authorized amount |  |  |  |  | $ 50 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uis_BoardOfDirectorsMember

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