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Foreign Currency Translation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2015 Operator
Foreign Currency Translation [Line Items]
Foreign exchange loss	$ 5.8us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Number of foreign currency exchange systems		2uis_NumberOfForeignCurrencyExchangeSystems
Venezuelan Subsidiary
Foreign Currency Translation [Line Items]
Foreign currency exchange rate		6.3us-gaap_ForeignCurrencyExchangeRateTranslation1 / dei_LegalEntityAxis = uis_VenezuelanSubsidiaryMember
Asset, Reporting Currency Denominated, Value		8us-gaap_AssetReportingCurrencyDenominatedValue / dei_LegalEntityAxis = uis_VenezuelanSubsidiaryMember

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Number Of Foreign Currency Exchange Systems

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The reporting currency-denominated asset value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section S99

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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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