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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
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)