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Supplemental Pro Forma Information (Detail) - Global Thermoelectric Inc - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |
Product revenues | $ 824,311 | $ 694,697
Net income | $ 71,997 | $ 35,348

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