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Business Segment Information - Summary of Net Sales by Geographic Destination for Each Reporting Unit (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales $ 111,547 $ 108,942 $ 220,256 $ 211,680
BioStim [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales 48,211 47,174 94,374 91,713
Extremity Fixation [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales 24,788 24,747 52,292 48,692
Spine Fixation [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales 23,880 21,360 44,587 40,627
Biologics [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales 14,668 15,661 29,003 30,648
U.S. [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales 88,745 87,604 173,699 169,720
U.S. [Member] | BioStim [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales 48,202 47,162 94,339 91,701
U.S. [Member] | Extremity Fixation [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales 7,023 6,741 13,939 13,320
U.S. [Member] | Spine Fixation [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales 18,853 18,050 36,432 34,085
U.S. [Member] | Biologics [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales 14,667 15,651 28,989 30,614
International [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales 22,802 21,338 46,557 41,960
International [Member] | BioStim [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales 9 12 35 12
International [Member] | Extremity Fixation [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales 17,765 18,006 38,353 35,372
International [Member] | Spine Fixation [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales 5,027 3,310 8,155 6,542
International [Member] | Biologics [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Net sales $ 1 $ 10 $ 14 $ 34