Revenue Recognition and Accounts Receivable - Schedule of Net Sales Major Product Category by Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 115,850	$ 111,547	$ 224,962	$ 220,256
Change	3.90%		2.10%
Bone Growth Therapies [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 50,109	48,211	$ 97,392	94,374
Change	3.90%		3.20%
Spinal Implants [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 23,226	23,880	$ 46,129	44,587
Change	(2.70%)		3.50%
Biologics [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 16,744	14,668	$ 32,476	29,003
Change	14.20%		12.00%
Global Spine [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 90,079	86,759	$ 175,997	167,964
Change	3.80%		4.80%
Global Extremities [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 25,771	$ 24,788	$ 48,965	$ 52,292
Change	4.00%		(6.40%)