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Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]      
Long-term debt, due in 2017 $ 210.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree    
Interest rate of the debt instruments 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage    
Capital leases, due in 2015 1.8us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent    
Capital leases, due in 2016 2.6us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears    
Capital leases, due in 2017 2.7us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears    
Capital leases, due in 2018 2.4us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears    
Capital leases, due in 2019 1.3us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears    
Capital leases, thereafter 3.2us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter    
Cash paid for interest 13.2us-gaap_InterestPaid 12.9us-gaap_InterestPaid 42.5us-gaap_InterestPaid
Capitalized interest expense 4.0us-gaap_InterestCostsCapitalized 3.2us-gaap_InterestCostsCapitalized 5.3us-gaap_InterestCostsCapitalized
Maximum borrowing capacity under the credit agreement 150us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity    
Letters of credit outstanding 18.8us-gaap_LettersOfCreditOutstandingAmount    
Availability under the facility 100.00us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity    
Aggregate debt default amount to violate covenant, minimum 50uis_AmountOfOtherDebtDefaultThatViolatesDebtCovenants    
Covenant conditions of the credit facility The company is required to maintain a minimum fixed charge coverage ratio only if the company’s availability under the credit facility falls below the greater of 12.5% of the lenders’ commitments under the facility and $18.75 million. The credit agreement allows the company to pay dividends on its capital stock in an amount up to $22.5 million per year unless the company is in default and to, among other things, repurchase its equity, prepay other debt, incur other debt or liens, dispose of assets and make acquisitions, loans and investments, provided the company complies with certain requirements and limitations set forth in the agreement.    
Maximum      
Debt Instrument [Line Items]      
Availability under the facility 18.75us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Percentage of lenders' commitments under facility 12.50%uis_LineOfCreditFacilityPercentageOfRemainingBorrowingCapacity
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Dividends on capital stock 22.5us-gaap_Dividends
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Letter of Credit      
Debt Instrument [Line Items]      
Maximum borrowing capacity under the credit agreement $ 100us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember