Business Segment Information - Summary of EBIDTA by Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Total EBITDA	$ 5,049	$ 15,022	$ 19,663	$ 18,416
Depreciation and amortization	(7,151)	(9,030)	(22,153)	(22,299)
Interest expense, net	(433)	(731)	(1,400)	(2,055)
Income (loss) before income taxes	(2,535)	5,261	(3,890)	(5,938)
Operating Segments [Member] | Global Spine [Member]
Segment Reporting Information [Line Items]
Total EBITDA	13,908	19,960	44,835	38,670
Operating Segments [Member] | Global Orthopedics [Member]
Segment Reporting Information [Line Items]
Total EBITDA	(196)	1,258	(650)	(3,995)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total EBITDA	$ (8,663)	$ (6,196)	$ (24,522)	$ (16,259)