Business Segment Information - Schedule of Net Sales by Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net Sales	$ 116,896	$ 105,247	$ 108,942	$ 102,738	$ 108,537	$ 98,497	$ 104,075	$ 98,679	$ 433,823	$ 409,788	$ 396,489
Percent of Total Net Sales									100.00%	100.00%	100.00%
BioStim [Member]
Segment Reporting Information [Line Items]
Net Sales									$ 185,900	$ 176,561	$ 164,955
Percent of Total Net Sales									42.90%	43.10%	41.60%
Extremity Fixation [Member]
Segment Reporting Information [Line Items]
Net Sales									$ 103,242	$ 102,683	$ 96,034
Percent of Total Net Sales									23.80%	25.10%	24.20%
Spine Fixation [Member]
Segment Reporting Information [Line Items]
Net Sales									$ 81,957	$ 72,632	$ 75,668
Percent of Total Net Sales									18.90%	17.70%	19.10%
Biologics [Member]
Segment Reporting Information [Line Items]
Net Sales									$ 62,724	$ 57,912	$ 59,832
Percent of Total Net Sales									14.40%	14.10%	15.10%