Business Segment Information - Schedule of Net Sales by Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 108,709	$ 102,738
Change	5.80%
BioStim [Member]
Segment Reporting Information [Line Items]
Net sales	$ 46,163	44,539
Change	3.60%
Biologics [Member]
Segment Reporting Information [Line Items]
Net sales	$ 14,335	14,987
Change	(4.40%)
Extremity Fixation [Member]
Segment Reporting Information [Line Items]
Net sales	$ 27,504	23,945
Change	14.90%
Spine Fixation [Member]
Segment Reporting Information [Line Items]
Net sales	$ 20,707	$ 19,267
Change	7.50%