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, 2020 USD ($)
Revenue Discount Rate
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Contingent consideration	$ 33,700
Revenue Discount Rate | Minimum [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Business combination contingent consideration liability measurement input	5.0
Revenue Discount Rate | Maximum [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Business combination contingent consideration liability measurement input	5.3
Payment Discount Rate | Minimum [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Business combination contingent consideration liability measurement input	6.7
Payment Discount Rate | Maximum [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Business combination contingent consideration liability measurement input	7.0
Projected Year of Payment | Minimum [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Business combination contingent consideration liability measurement period	2021
Projected Year of Payment | Maximum [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Business combination contingent consideration liability measurement period	2022