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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 | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |  |  |
Net sales | $ 112,718 | $ 112,350 | $ 225,173 | $ 219,163
Net income (loss) from continuing operations | $ 2,161 | $ 2,484 | $ 7,099 | $ (1,076)

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