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INCOME TAXES (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Unrecognized tax benefits    
Unrecognized tax benefits related to deferred tax assets and federal tax benefit of state income tax items $ 35,200,000utsi_UnrecognizedTaxBenefitsRelatedToDeferredTaxAssetsAndFederalTaxBenefitOfStateIncomeTaxItems  
Interest and penalties recognized in the statement of income 300,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Accrued interest and penalties 3,900,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 3,600,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Undistributed earnings of foreign subsidiaries permanently reinvested outside the United States 97,400,000us-gaap_UndistributedEarningsOfForeignSubsidiaries  
Operating loss carryforwards [Line Items]    
Net operating loss carryforwards expired amount 230,597,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 254,153,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred tax assets and related valuation allowance which have been removed 35,600,000utsi_DeferredTaxAssetsOperatingLossCarryforwardsWhichHaveBeenRemoved  
United States [Member] | U.S. [Member]    
Operating loss carryforwards [Line Items]    
Valuation allowance against the related deferred tax assets 204,700,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ utsi_AllCountriesAxis
= country_US
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		  
Federal [Member] | U.S. [Member]    
Operating loss carryforwards [Line Items]    
Net operating loss carryforwards 552,700,000us-gaap_OperatingLossCarryforwards
/ utsi_AllCountriesAxis
= country_US
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		  
State [Member] | U.S. [Member]    
Operating loss carryforwards [Line Items]    
Net operating loss carryforwards 221,400,000us-gaap_OperatingLossCarryforwards
/ utsi_AllCountriesAxis
= country_US
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Foreign [Member] | China [Member]    
Operating loss carryforwards [Line Items]    
Net operating loss carryforwards 78,500,000us-gaap_OperatingLossCarryforwards
/ utsi_AllCountriesAxis
= country_CN
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		  
Net operating loss carryforwards expired amount 237,200,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ utsi_AllCountriesAxis
= country_CN
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		  
Deferred tax assets and related valuation allowance which have been removed 35,600,000utsi_DeferredTaxAssetsOperatingLossCarryforwardsWhichHaveBeenRemoved
/ utsi_AllCountriesAxis
= country_CN
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		  
Valuation allowance against the related deferred tax assets 11,800,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ utsi_AllCountriesAxis
= country_CN
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		  
Foreign [Member] | Countries other than U.S. and China [Member]    
Operating loss carryforwards [Line Items]    
Net operating loss carryforwards 94,900,000us-gaap_OperatingLossCarryforwards
/ utsi_AllCountriesAxis
= utsi_OtherThanUSAndChinaMember
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		  
Valuation allowance against the related deferred tax assets $ 14,100,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ utsi_AllCountriesAxis
= utsi_OtherThanUSAndChinaMember
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember