Business Segment Information - Summary of EBIDTA by Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Total EBITDA	$ 1,837	$ 12,383
Depreciation and amortization	(7,443)	(6,327)
Interest expense, net	(417)	(423)
Income (loss) before income taxes	(6,023)	5,633
Operating Segments [Member] | Global Spine [Member]
Segment Reporting Information [Line Items]
Total EBITDA	11,895	22,417
Operating Segments [Member] | Global Orthopedics [Member]
Segment Reporting Information [Line Items]
Total EBITDA	(2,229)	(1,894)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total EBITDA	$ (7,829)	$ (8,140)