Business Segment Information - Schedule of Net Sales by Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Net sales	$ 111,547	$ 108,942	$ 220,256	$ 211,680
Change	2.40%		4.10%
BioStim [Member]
Segment Reporting Information [Line Items]
Net sales	$ 48,211	47,174	$ 94,374	91,713
Change	2.20%		2.90%
Biologics [Member]
Segment Reporting Information [Line Items]
Net sales	$ 14,668	15,661	$ 29,003	30,648
Change	(6.30%)		(5.40%)
Extremity Fixation [Member]
Segment Reporting Information [Line Items]
Net sales	$ 24,788	24,747	$ 52,292	48,692
Change	0.20%		7.40%
Spine Fixation [Member]
Segment Reporting Information [Line Items]
Net sales	$ 23,880	$ 21,360	$ 44,587	$ 40,627
Change	11.80%		9.70%