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Segment Information and Concentrations of Risk - Schedule of Net Revenues, Operating Loss and Identifiable Assets of Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Net revenues by reportable segment:          
Net revenues $ 91,124 $ 102,446 $ 177,045 $ 202,596  
Operating loss by reportable segment:          
Operating loss (7,744) (4,445) (16,929) (42,272)  
Identifiable assets by reportable segment:          
Identifiable assets 150,396   150,396   161,531
Operating Segments [Member] | Mobile Computing Products [Member]
          
Net revenues by reportable segment:          
Net revenues 80,823 92,552 156,443 183,431  
Operating loss by reportable segment:          
Operating loss (3,348) (718) (8,848) (4,188)  
Identifiable assets by reportable segment:          
Identifiable assets 131,536   131,536   141,045
Operating Segments [Member] | M2M Products and Solutions [Member]
          
Net revenues by reportable segment:          
Net revenues 10,301 9,894 20,602 19,165  
Operating loss by reportable segment:          
Operating loss (4,396) (3,727) (8,081) (38,084)  
Identifiable assets by reportable segment:          
Identifiable assets $ 18,860   $ 18,860   $ 20,486