Business Segment Information - Summary of Net Sales by Geographic Destination for Each Reporting Unit (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	$ 113,499	$ 111,708	$ 338,461	$ 331,964
Global Spine [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	88,091	84,797	264,088	252,761
Global Extremities [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	25,408	26,911	74,373	79,203
U.S. [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	89,452	86,756	267,021	260,455
U.S. [Member] | Global Spine [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	82,816	79,502	246,943	239,262
U.S. [Member] | Global Extremities [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	6,636	7,254	20,078	21,193
International [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	24,047	24,952	71,440	71,509
International [Member] | Global Spine [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	5,275	5,295	17,145	13,499
International [Member] | Global Extremities [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	$ 18,772	$ 19,657	$ 54,295	$ 58,010