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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 1 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Aug. 31, 2012
UTStarcom Hong Kong Holdings Ltd.
UTStarcom Hong Kong Ltd.
Convertible Bond
Dec. 31, 2012
UTStarcom Hong Kong Holdings Ltd.
UTStarcom Hong Kong Ltd.
Convertible Bond
Dec. 31, 2012
UTStarcom Hong Kong Holdings Ltd.
UTStarcom Hong Kong Ltd.
Convertible Bond
Minimum
Dec. 31, 2012
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
Dec. 31, 2012
IP Messaging and US PDSN Assets
Jun. 30, 2010
IP Messaging and US PDSN Assets
Maximum
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
Dec. 31, 2012
IPTV operations
Dec. 31, 2012
IPTV operations
Dec. 31, 2011
IPTV operations
Dec. 31, 2010
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
Divestitures                                                                
Gain (loss) recorded on divestiture $ (16,239,000) $ 4,546,000 $ 5,548,000         $ 1,600,000 $ 800,000 $ 4,300,000     $ (900,000)       $ 100,000 $ 200,000 $ 200,000 $ 900,000 $ 900,000 $ 1,800,000     $ (17,500,000)       $ (17,500,000)      
Reassessment period                     1 year                                          
Amount of obligations paid 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              
Net liabilities transferred in connection with divestiture                           1,700,000               300,000                    
Cash proceeds                           400,000     100,000 200,000 200,000 900,000 900,000                      
Potential additional contingent consideration                               1,600,000                                
Gain (loss) recorded on divestiture, after tax                           2,100,000 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              
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 6,100,000 4,100,000                                                   22,700,000        
Revenues recognized 186,728,000 320,576,000 291,535,000                                         2,200,000 29,500,000 141,400,000 152,600,000          
Amount invested       20,000,000                                                   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%