Business Segment Information - Schedule of Net Sales by Major Product Category by Reporting Segment (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
Segment Reporting Information [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
Percent of Total Net Sales									100.00%	100.00%	100.00%
Bone Growth Therapies [Member]
Segment Reporting Information [Line Items]
Net Sales									$ 197,181	$ 195,252	$ 185,900
Percent of Total Net Sales									42.90%	43.10%	42.90%
Spinal Implants [Member]
Segment Reporting Information [Line Items]
Net Sales									$ 94,544	$ 91,658	$ 81,957
Percent of Total Net Sales									20.60%	20.20%	18.90%
Biologics [Member]
Segment Reporting Information [Line Items]
Net Sales									$ 65,496	$ 59,684	$ 62,724
Percent of Total Net Sales									14.20%	13.20%	14.40%
Global Spine [Member]
Segment Reporting Information [Line Items]
Net Sales									$ 357,221	$ 346,594	$ 330,581
Percent of Total Net Sales									77.70%	76.50%	76.20%
Global Extremities [Member]
Segment Reporting Information [Line Items]
Net Sales									$ 102,734	$ 106,448	$ 103,242
Percent of Total Net Sales									22.30%	23.50%	23.80%