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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 | $ 35,200,000 utsi_UnrecognizedTaxBenefitsRelatedToDeferredTaxAssetsAndFederalTaxBenefitOfStateIncomeTaxItems |
Interest and penalties recognized in the statement of income | 300,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense |
Accrued interest and penalties | 3,900,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 3,600,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Undistributed earnings of foreign subsidiaries permanently reinvested outside the United States | 97,400,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |
Operating loss carryforwards [Line Items] |  |
Net operating loss carryforwards expired amount | 230,597,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 254,153,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred tax assets and related valuation allowance which have been removed | 35,600,000 utsi_DeferredTaxAssetsOperatingLossCarryforwardsWhichHaveBeenRemoved |
United States [Member] | U.S. [Member] |  |
Operating loss carryforwards [Line Items] |  |
Valuation allowance against the related deferred tax assets | 204,700,000 us-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 | 552,700,000 us-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 | 221,400,000 us-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 | 78,500,000 us-gaap_OperatingLossCarryforwards / utsi_AllCountriesAxis = country_CN / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
Net operating loss carryforwards expired amount | 237,200,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / utsi_AllCountriesAxis = country_CN / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
Deferred tax assets and related valuation allowance which have been removed | 35,600,000 utsi_DeferredTaxAssetsOperatingLossCarryforwardsWhichHaveBeenRemoved / utsi_AllCountriesAxis = country_CN / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
Valuation allowance against the related deferred tax assets | 11,800,000 us-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 | 94,900,000 us-gaap_OperatingLossCarryforwards / utsi_AllCountriesAxis = utsi_OtherThanUSAndChinaMember / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
Valuation allowance against the related deferred tax assets | $ 14,100,000 us-gaap_OperatingLossCarryforwardsValuationAllowance / utsi_AllCountriesAxis = utsi_OtherThanUSAndChinaMember / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 30 -Paragraph 5 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6907311&loc=d3e30536-109315 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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