Business Segment Information - Summary of EBIDTA by Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total EBITDA	$ 15,022	$ (20,753)	$ 18,416	$ (13,485)
Depreciation and amortization	(9,030)	(6,275)	(22,299)	(18,180)
Interest income (expense), net	(731)	186	(2,055)	386
Income (loss) before income taxes	5,261	(26,842)	(5,938)	(31,279)
Operating Segments [Member] | Global Spine [Member]
Segment Reporting Information [Line Items]
Total EBITDA	19,960	(6,033)	38,670	21,065
Operating Segments [Member] | Global Extremities [Member]
Segment Reporting Information [Line Items]
Total EBITDA	1,258	1,229	(3,995)	3,806
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total EBITDA	$ (6,196)	$ (15,949)	$ (16,259)	$ (38,356)