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Business Segment Information - Summary of EBIDTA by Reporting Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Total EBITDA $ (20,753) $ 3,591 $ (13,485) $ 25,568
Depreciation and amortization (6,275) (4,738) (18,180) (13,661)
Interest income (expense), net 186 (181) 386 (615)
Income (loss) before income taxes (26,842) (1,328) (31,279) 11,292
Operating Segments [Member] | Global Spine [Member]        
Segment Reporting Information [Line Items]        
Total EBITDA (6,033) 15,637 21,065 53,492
Operating Segments [Member] | Global Extremities [Member]        
Segment Reporting Information [Line Items]        
Total EBITDA 1,229 3,357 3,806 7,173
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Total EBITDA $ (15,949) $ (15,403) $ (38,356) $ (35,097)