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Components Of Long-Term Debt (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Interest rate of the debt instruments 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage  
6.25% Senior Notes Due 2017    
Debt Instrument [Line Items]    
Senior notes, maturity year 2017 2017
Interest rate of the debt instruments 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= uis_SixPointTwoFivePercentageSeniorSecuredNotesDueTwoThousandSeventeenMember		 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= uis_SixPointTwoFivePercentageSeniorSecuredNotesDueTwoThousandSeventeenMember