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Fair Value Measurements and Investments - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value $ 11,200 $ 12,160
Deferred compensation plan, Liabilities (1,381) (1,441)
Liabilities fair value, Total (38,656) (37,216)
Spinal Kinetics [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Contingent consideration (36,900) (35,400)
Other [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Contingent consideration (375) (375)
Fair Value, Inputs, Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 5,000  
Deferred compensation plan, Liabilities (1,381)  
Liabilities fair value, Total (1,381)  
Fair Value, Inputs, Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 6,200  
Liabilities fair value, Total (37,275)  
Fair Value, Inputs, Level 3 [Member] | Spinal Kinetics [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Contingent consideration (36,900)  
Fair Value, Inputs, Level 3 [Member] | Other [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Contingent consideration (375)  
Convertible Loan Agreement | Neo Medical [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 5,000 5,000
Convertible Loan Agreement | Fair Value, Inputs, Level 2 [Member] | Neo Medical [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 5,000  
Preferred Equity Securities | Neo Medical [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value 6,200 $ 7,160
Preferred Equity Securities | Fair Value, Inputs, Level 3 [Member] | Neo Medical [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets fair value $ 6,200