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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
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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

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- Definition The expected number of positions to be eliminated as a result of restructuring activities. + References No definition available. + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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