Fair Value Measurements and Investments - Schedule of Valuation Methodology and Unobservable Inputs for Level 3 Assets and Liabilities Measured at Fair Value (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Spinal Kinetics [Member] | Revenue Discount Rate
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Consideration transferred	$ 11,700
Spinal Kinetics [Member] | Revenue Discount Rate | Minimum [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Business combination contingent consideration liability measurement input	5.9
Spinal Kinetics [Member] | Revenue Discount Rate | Maximum [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Business combination contingent consideration liability measurement input	7.4
Spinal Kinetics [Member] | Payment Discount Rate | Minimum [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Business combination contingent consideration liability measurement input	3.2
Spinal Kinetics [Member] | Payment Discount Rate | Maximum [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Business combination contingent consideration liability measurement input	4.7
Spinal Kinetics [Member] | Projected Year of Achievement
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Business combination contingent consideration liability measurement period	2023
Spinal Kinetics [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Spinal Kinetics contingent consideration estimated fair value at January 1	$ 17,200	$ 35,400
Increase (decrease) in fair value recognized in acquisition-related amortization and remeasurement	(5,500)	1,500
Spinal Kinetics contingent consideration estimated fair value at March 31	11,700	$ 36,900
Neo Medical [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Neo Medical Convertible Loan	$ 5,780
Fair value implied volatility	71.30%
Fair value discount rate	16.90%