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Business Combinations - Pro Forma Results (Details) - Residential Control Systems, Inc - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |
Net sales | $ 696,352 | $ 659,272
Net income (loss) | (10,538) | 19,997
Net income (loss) attributable to Universal Electronics Inc. | $ (10,538) | $ 19,967
Basic earnings (loss) per share attributable to Universal Electronics, Inc. (in dollars per share) | $ (0.0073) | $ 1.38
Diluted earnings (loss) per share attributable to Universal Electronics, Inc. (in dollars per share) | $ (0.0073) | $ 1.35

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