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Business Segment Information - Summary of EBIDTA by Reporting Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]        
Total EBITDA $ 6,393 $ 6,826 $ 7,268 $ 21,977
Depreciation and amortization (6,178) (4,554) (11,905) (8,923)
Interest income (expense), net 457 (251) 200 (434)
Income (loss) before income taxes 672 2,021 (4,437) 12,620
Operating Segments [Member] | Global Spine [Member]        
Segment Reporting Information [Line Items]        
Total EBITDA 16,523 19,030 27,098 37,855
Operating Segments [Member] | Global Extremities [Member]        
Segment Reporting Information [Line Items]        
Total EBITDA 2,750 488 2,577 3,816
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Total EBITDA $ (12,880) $ (12,692) $ (22,407) $ (19,694)