Business Segment Information - Schedule of Net Sales by Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 105,247	$ 98,497	$ 316,927	$ 301,251
Change	6.90%		5.20%
BioStim [Member]
Segment Reporting Information [Line Items]
Net sales	$ 44,427	42,956	$ 136,140	128,758
Change	3.40%		5.70%
Biologics [Member]
Segment Reporting Information [Line Items]
Net sales	$ 15,218	14,335	$ 45,866	42,685
Change	6.20%		7.50%
Extremity Fixation [Member]
Segment Reporting Information [Line Items]
Net sales	$ 25,447	24,314	$ 74,139	75,840
Change	4.70%		(2.20%)
Spine Fixation [Member]
Segment Reporting Information [Line Items]
Net sales	$ 20,155	$ 16,892	$ 60,782	$ 53,968
Change	19.30%		12.60%