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Global Thermoelectric Acquisition - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Global Thermoelectric Inc | Sep. 30, 2014 Global Thermoelectric Inc
Business Acquisition [Line Items] |  |  |  |
Product revenues |  |  | $ 8,532 | $ 16,706
Operating Income |  |  | 639 | 597
Net assets acquired |  |  | 31,102 | 31,102
Cash acquired on acquisition |  |  |  | 3,061
Goodwill | 30,264 | 25,809 | 6,601 | 6,601
Intangible Assets before Foreign Currency Adjustment |  |  | 9,871 | 9,871
Decrease in intangible assets, net, fluctuations in foreign currency exchange rates |  |  |  | 120
Amortization expense |  |  | $ 667 | $ 1,316

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