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Long-Term Investments - Equity Investments (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 ST-Ericsson AT SA [Member] | Dec. 31, 2012 ST-Ericsson AT SA [Member] | Feb. 03, 2009 ST-Ericsson AT SA [Member] | Dec. 31, 2013 St-Ericsson SA [Member] | Dec. 31, 2012 St-Ericsson SA [Member] | Dec. 31, 2013 3Sun S.r.l. [Member] | Dec. 31, 2012 3Sun S.r.l. [Member] | Dec. 31, 2013 MicroOLED SAS [Member] | Sep. 30, 2013 MicroOLED SAS [Member] | Dec. 31, 2012 MicroOLED SAS [Member] | Sep. 30, 2012 MicroOLED SAS [Member]
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Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments, Ownership percentage |  |  |  | 49.00% | 50.00% | 50.00% |  | 33.30% | 33.30% | 39.60% |  | 39.60% | 39.60%
Equity investments, Carrying value | $ 63.0 | $ 106.0 |  | $ 9.0 |  | $ 50.0 |  | $ 13.0 | $ 91.0 |  | $ 4.1 | $ 6.0 | $ 7.0

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