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Restructuring - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Employees
Sep. 30, 2012
Sep. 30, 2013
Mobile Computing Products [Member]
Sep. 30, 2013
M2M Products and Solutions [Member]
Sep. 30, 2013
Employee Severance Costs [Member]
Sep. 30, 2013
Employee Severance Costs [Member]
Dec. 31, 2013
Employee Severance Costs [Member]
Mobile Computing Products [Member]
Scenario, Forecast [Member]
Sep. 30, 2013
Other Restructuring Charges [Member]
Sep. 30, 2013
Other Restructuring Charges [Member]
Dec. 31, 2013
Facility Closing [Member]
Mobile Computing Products [Member]
Scenario, Forecast [Member]
Restructuring And Related Activity Line Items                        
Reduction in number of employees after restructuring     72                  
Additional employee severance expenses $ 2,411,000 $ 0 $ 2,411,000 $ 0 $ 2,200,000 $ 206,000 $ 2,300,000 $ 2,273,000 $ 600,000 $ 138,000 $ 138,000 $ 500,000