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Acquisitions - Summary of Unaudited Pro forma Results (Detail) - Spinal Kinetics [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Business Acquisition [Line Items]        
Net sales $ 115,850 $ 115,129 $ 224,962 $ 227,584
Net income (loss) $ (547) $ 597 $ 350 $ 5,457