Business Segment Information - Summary of Net Sales by Geographic Destination for Each Reporting Unit (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 121,494	$ 113,499	$ 115,850	$ 109,112	$ 121,078	$ 111,708	$ 111,547	$ 108,709	$ 459,955	$ 453,042	$ 433,823
Global Spine [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									357,221	346,594	330,581
Global Extremities [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									102,734	106,448	103,242
U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									361,939	355,353	345,145
U.S. [Member] | Global Spine [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									335,410	326,994	318,227
U.S. [Member] | Global Extremities [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									26,529	28,359	26,918
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									98,016	97,689	88,678
International [Member] | Global Spine [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									21,811	19,600	12,354
International [Member] | Global Extremities [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 76,205	$ 78,089	$ 76,324