Business Segment Information - Summary of Non-GAAP Net Margin 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]
Non-GAAP net margin	$ 34,037	$ 36,900	$ 100,956	$ 104,136
General and administrative	18,068	19,272	56,759	54,822
Research and development	6,935	6,858	21,246	21,294
Charges related to U.S. Government resolutions		1,499		14,369
Operating income	9,034	9,271	22,951	13,651
Interest income (expense), net	(15)	471	106	320
Other income (expense), net	479	(634)	(3,284)	1,346
Income before income taxes	9,498	9,108	19,773	15,317
Operating Segments [Member] | BioStim [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin	18,285	19,996	54,887	54,980
Operating Segments [Member] | Biologics [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin	6,010	6,821	18,651	19,642
Operating Segments [Member] | Extremity Fixation [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin	7,723	8,834	20,901	24,170
Operating Segments [Member] | Spine Fixation [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin	2,122	1,388	6,825	5,925
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin	(103)	(139)	(308)	(581)
Material Reconciling Items [Member]
Segment Reporting Information [Line Items]
General and administrative	18,068	19,272	56,759	54,822
Research and development	$ 6,935	$ 6,858	$ 21,246	$ 21,294