Business Segment Information - Summary of Non-GAAP Net Margin by Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Non-GAAP net margin									$ 150,887	$ 142,416	$ 140,648
General and administrative									84,506	71,905	76,409
Research and development									33,218	29,700	28,803
Changes in fair value of contingent consideration									3,069
Charges related to U.S. Government resolutions											14,369
Operating income	$ 12,402	$ 3,907	$ 5,915	$ 7,870	$ 17,860	$ 9,034	$ 7,998	$ 5,919	30,094	40,811	21,067
Interest income (expense), net									(828)	(416)	763
Other expense, net									(6,381)	(4,004)	(2,806)
Income before income taxes									22,885	36,391	19,024
Operating Segments [Member] | Bone Growth Therapies [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin									86,252	77,369	75,469
Operating Segments [Member] | Spinal Implants [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin									7,628	8,730	8,650
Operating Segments [Member] | Biologics [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin									26,298	25,692	26,891
Operating Segments [Member] | Orthofix Extremities [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin									31,391	31,071	30,526
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Non-GAAP net margin									(682)	(446)	(888)
Material Reconciling Items [Member]
Segment Reporting Information [Line Items]
General and administrative									84,506	71,905	76,409
Research and development									$ 33,218	$ 29,700	$ 28,803