Business Segment Information - Schedule of Net Sales by Major Product Category by Reporting Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net Sales	$ 406,562	$ 459,955	$ 453,042
Percent of Total Net Sales	100.00%	100.00%	100.00%
Bone Growth Therapies [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 171,396	$ 197,181	$ 195,252
Percent of Total Net Sales	42.20%	42.90%	43.10%
Spinal Implants [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 94,857	$ 94,544	$ 91,658
Percent of Total Net Sales	23.30%	20.60%	20.20%
Biologics [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 55,482	$ 65,496	$ 59,684
Percent of Total Net Sales	13.60%	14.20%	13.20%
Global Spine [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 321,735	$ 357,221	$ 346,594
Percent of Total Net Sales	79.10%	77.70%	76.50%
Global Extremities [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 84,827	$ 102,734	$ 106,448
Percent of Total Net Sales	20.90%	22.30%	23.50%