Business Segment Information - Summary of Non-GAAP Net Margin 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]
Non-GAAP net margin									$ 142,416	$ 140,648	$ 131,884
General and administrative									74,388	74,404	87,157
Research and development									29,700	28,803	26,389
SEC / FCPA matters and related costs									(2,483)	2,005	9,083
Charges related to U.S. Government resolutions										14,369
Operating income	$ 17,860	$ 9,034	$ 7,998	$ 5,919	$ 7,416	$ 9,271	$ (2,695)	$ 7,075	40,811	21,067	9,255
Interest income (expense), net									(416)	763	(489)
Other expense, net									(4,004)	(2,806)	(259)
Income before income taxes									36,391	19,024	8,507
Operating Segments [Member] | BioStim [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin									77,369	75,469	67,878
Operating Segments [Member] | Extremity Fixation [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin									31,071	30,526	29,493
Operating Segments [Member] | Spine Fixation [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin									8,730	8,650	8,547
Operating Segments [Member] | Biologics [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin									25,692	26,891	27,226
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin									(446)	(888)	(1,260)
Material Reconciling Items [Member]
Segment Reporting Information [Line Items]
General and administrative									74,388	74,404	87,157
Research and development									29,700	28,803	26,389
SEC / FCPA matters and related costs									$ (2,483)	$ 2,005	$ 9,083