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INCOME TAXES (Summary of Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unrecognized tax benefits
Beginning balance-gross unrecognized tax benefits (UTB's)	$ 45,430us-gaap_UnrecognizedTaxBenefits	$ 54,012us-gaap_UnrecognizedTaxBenefits	$ 55,650us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year	142us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	151us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	80us-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)	45,382us-gaap_UnrecognizedTaxBenefits	45,430us-gaap_UnrecognizedTaxBenefits	54,012us-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	$ 10,185us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	$ 10,019us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	$ 12,298us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

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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



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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

+ References

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

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-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

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Represents the portion of unrecognized tax benefits, which is related to credit in deferred tax assets.

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Represents the portion of unrecognized tax benefits, which is related to the federal tax benefit of state income tax items.

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No definition available.

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