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Acquisition of Spinal Kinetics, Inc. - Summary of Unaudited Pro forma Results (Detail) - Spinal Kinetics [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |
Net sales | $ 111,708 | $ 109,019 | $ 336,882 | $ 328,182
Net income from continuing operations | $ 78 | $ 1,415 | $ 7,055 | $ 448

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