Revenue Recognition and Accounts Receivable - Schedule of Net Sales Major Product Category by Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 113,499	$ 111,708	$ 338,461	$ 331,964
Change	1.60%		2.00%
Bone Growth Therapies [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 48,836	48,059	$ 146,228	142,433
Change	1.60%		2.70%
Spinal Implants [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 22,947	22,102	$ 69,076	66,689
Change	3.80%		3.60%
Biologics [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 16,308	14,636	$ 48,784	43,639
Change	11.40%		11.80%
Global Spine [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 88,091	84,797	$ 264,088	252,761
Change	3.90%		4.50%
Global Extremities [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 25,408	$ 26,911	$ 74,373	$ 79,203
Change	(5.60%)		(6.10%)