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DIVESTITURES (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended |  | 3 Months Ended | 4 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 0 Months Ended |  | 0 Months Ended | 3 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Aug. 31, 2012 UTStarcom Hong Kong Holdings Ltd. UTStarcom Hong Kong Ltd. Convertible Bond | Dec. 31, 2013 UTStarcom Hong Kong Holdings Ltd. UTStarcom Hong Kong Ltd. Convertible Bond | Dec. 31, 2013 UTStarcom Hong Kong Holdings Ltd. UTStarcom Hong Kong Ltd. Convertible Bond Minimum | Dec. 31, 2013 UTStarcom Hong Kong Holdings Ltd. UTStarcom Hong Kong Ltd. Convertible Bond Maximum | Sep. 30, 2010 China PDSN Assets | Dec. 31, 2012 China PDSN Assets | Dec. 31, 2011 China PDSN Assets | Dec. 31, 2011 China PDSN Assets Minimum | Sep. 17, 2012 EMEA Operations | Dec. 31, 2010 EMEA Operations | Jun. 30, 2010 IP Messaging and US PDSN Assets | Jun. 30, 2010 IP Messaging and US PDSN Assets Maximum | Mar. 31, 2013 IP Messaging and US PDSN Assets Contingent consideration | Jun. 30, 2012 IP Messaging and US PDSN Assets Contingent consideration | Dec. 31, 2011 IP Messaging and US PDSN Assets Contingent consideration | Mar. 31, 2011 IP Messaging and US PDSN Assets Contingent consideration | Dec. 31, 2010 IP Messaging and US PDSN Assets Contingent consideration | Sep. 30, 2010 IP Messaging and US PDSN Assets Contingent consideration | Mar. 31, 2010 Remote Access Server product line | Jan. 31, 2010 Remote Access Server product line | Jun. 30, 2013 IPTV operations | Dec. 31, 2012 IPTV operations | Dec. 31, 2013 IPTV operations | Dec. 31, 2012 IPTV operations | Dec. 31, 2011 IPTV operations | Aug. 31, 2012 IPTV operations | Dec. 31, 2012 IPTV operations UTStarcom Hong Kong Holdings Ltd. | Aug. 31, 2012 IPTV operations UTStarcom Hong Kong Holdings Ltd. Convertible Bond | Aug. 31, 2012 IPTV operations Current assets | Aug. 31, 2012 IPTV operations Property, plant and equipment and other long term assets | Mar. 22, 2013 NGN operations | Dec. 31, 2013 NGN operations | Mar. 22, 2013 DOCSIS-EOC product line | Sep. 30, 2013 DOCSIS-EOC product line | Jun. 30, 2013 DOCSIS-EOC product line
Divestitures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) recorded on divestiture | $ (1,307,000) | $ (16,239,000) | $ 4,546,000 |  |  |  |  | $ 1,600,000 | $ 800,000 | $ 4,300,000 |  |  | $ (900,000) |  |  | $ 100,000 | $ 100,000 | $ 200,000 | $ 200,000 | $ 900,000 | $ 900,000 | $ 1,800,000 |  | $ 100,000 |  |  | $ (17,500,000) |  |  | $ (17,500,000) |  |  |  | $ 3,200,000 |  |  |  |
Reassessment period |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of obligations paid | 503,000 | 56,010,000 |  |  |  |  |  |  |  |  |  | 600,000 | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, deferred gain on disposal |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of obligations remaining in accrual balance |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  | 600,000 |  | 600,000 |  |  |  |  |  |  |  | 800,000 |  |  |
Net liabilities transferred in connection with divestiture |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  | 100,000 | 100,000 | 200,000 | 200,000 | 900,000 | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 | 1,800,000 | 1,800,000
Potential additional contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) recorded on divestiture, after tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of consideration paid by the Company upon divestiture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |  |
Assets transferred in connection with divestiture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,400,000 | 1,200,000 |  |  |  |  |
Liabilities transferred in connection with divestiture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74,100,000 |  |  |  |  |  |  |  |  |
Loss related to severance liabilities for termination of employees or transfer of employees to the buyer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,400,000 |  |  |  |  |  |  |  |  |  |  |
Loss related to write-off of assets not transferred to the buyer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,800,000 |  |  |  |  |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |  |  |  |  |  |  |  |  |
Payment of unpaid balance related to divestiture | 2,369,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from the net liability release |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |
Impact on gross margin from the future revenue recognition of unassigned contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Deferred service costs related to unassigned contracts | 5,300,000 | 6,100,000 | 4,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,700,000 |  |  |  |  |  |  |  |  |
Revenues recognized | 164,439,000 | 186,728,000 | 320,576,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 | 1,400,000 | 29,500,000 | 141,400,000 |  |  |  |  |  |  |  |  |  |
Liabilities and deferred costs related to un-assigned contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,300,000 | 29,300,000 | 47,300,000 |  |  |  |  |  |  |  |  |  |  |
Divestiture loss related to on-going performance cost for the assigned contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 |  |  |  |
Divestiture loss related to severance cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |
Amount invested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |
Interest rate of debt securities (as a percent) |  |  |  | 6.50% | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt securities to be converted if P&L run-rate break-even is achieved on or prior to the Maturity Date |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares to be issued on conversion if P&L run-rate break-even is achieved on or prior to the Maturity Date |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares to be issued on conversion at the Maturity Date |  |  |  |  |  | 25.00% | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition In a transaction not treated as a divestiture for accounting purposes and in which the disposed operation is not consolidated for accounting purposes, the aggregate amount of the disposed assets that are segregated in the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section E -Paragraph Question 2 + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of shares to be issued on conversion of debt securities on or prior to the maturity date, if the specified condition is satisfied. + References No definition available. + Details
Name: | utsi_InvestmentInDebtSecuritiesPercentageOfSharesToBeIssuedOnConversionOnSatisfactionOfSpecifiedConditionOnOrPriorToMaturityDate
Namespace Prefix: | utsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow associated with the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References No definition available. + Details
Name: | utsi_PaymentsOnDivestitureOfBusinesses
Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of liability and deferred cost related to un-assigned contracts. + References No definition available. + Details
Name: | utsi_RevenueRecognitionLiabilityAndDeferredCostRelatedToUnassignedContracts
Namespace Prefix: | utsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant