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INCOME TAXES (Summary of Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Unrecognized tax benefits |  |  |
Beginning balance-gross unrecognized tax benefits (UTB's) | $ 45,430 us-gaap_UnrecognizedTaxBenefits | $ 54,012 us-gaap_UnrecognizedTaxBenefits | $ 55,650 us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year | 142 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 151 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 80 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Reductions for tax positions related to prior years | (190)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (1,627)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (1,288)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Lapse of statute of limitations |  | (7,106)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (430)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Ending balance-gross unrecognized tax benefits (UTB's) | 45,382 us-gaap_UnrecognizedTaxBenefits | 45,430 us-gaap_UnrecognizedTaxBenefits | 54,012 us-gaap_UnrecognizedTaxBenefits
UTB's as a credit in deferred taxes | (33,021)utsi_UnrecognizedTaxBenefitsCreditInDeferredTaxes | (33,187)utsi_UnrecognizedTaxBenefitsCreditInDeferredTaxes | (39,402)utsi_UnrecognizedTaxBenefitsCreditInDeferredTaxes
Federal benefit of state taxes | (2,176)utsi_UnrecognizedTaxBenefitsFederalBenefitOfStateTaxes | (2,244)utsi_UnrecognizedTaxBenefitsFederalBenefitOfStateTaxes | (2,312)utsi_UnrecognizedTaxBenefitsFederalBenefitOfStateTaxes
UTB's that would impact the effective tax rate | $ 10,185 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | $ 10,019 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | $ 12,298 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period 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 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Represents the portion of unrecognized tax benefits, which is related to credit in deferred tax assets. + References No definition available. + Details
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- Definition Represents the portion of unrecognized tax benefits, which is related to the federal tax benefit of state income tax items. + References No definition available. + Details
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