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INCOME TAXES (Other - Narrative) (Details)	12 Months Ended	36 Months Ended	48 Months Ended
	Dec. 31, 2014	Dec. 31, 2010	Dec. 31, 2014
U.S. [Member]
INCOME TAXES [Line Items]
Statutory tax rate (as a percent)	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / utsi_AllCountriesAxis = country_US
China [Member]
INCOME TAXES [Line Items]
Statutory tax rate (as a percent)	25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / utsi_AllCountriesAxis = country_CN
Reduced tax rate for qualified high technology enterprises (as a percent)	15.00%utsi_ReducedIncomeTaxRateApplicableToHighAndNewTechnologyEnterprise / utsi_AllCountriesAxis = country_CN
Number of subsidiaries approved for the reduced tax rate	1utsi_NumberOfSubsidiariesApprovedForReducedTaxRate / utsi_AllCountriesAxis = country_CN
China [Member] | HUTS [Member]
INCOME TAXES [Line Items]
Reduced tax rate for qualified high technology enterprises (as a percent)		15.00%utsi_ReducedIncomeTaxRateApplicableToHighAndNewTechnologyEnterprise / utsi_AllCountriesAxis = country_CN / dei_LegalEntityAxis = utsi_UTStarcomTelecomCoLtdMember	15.00%utsi_ReducedIncomeTaxRateApplicableToHighAndNewTechnologyEnterprise / utsi_AllCountriesAxis = country_CN / dei_LegalEntityAxis = utsi_UTStarcomTelecomCoLtdMember
Valid period for reduced income tax rate applicable to qualified high technology enterprise		3 years	3 years

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I)

-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

+ Details

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- Details

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- Definition

Represents the number of subsidiaries of the entity approved for the reduced tax rate.

+ References

No definition available.

+ Details

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X

- Definition

Represents the reduced income tax rate applicable to High and new technology enterprise (HNTE).

+ References

No definition available.

+ Details

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- Definition

Represents the period for which reduced income tax rate applicable on High and new technology enterprise.

+ References

No definition available.

+ Details

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