Fair Value Measurements - Financial Assets and (Liabilities) Carried at Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contract liabilities, current and long-term	$ (2,540)	$ (4,358)
Foreign currency contract assets, current and long-term	2,439	3,078
Foreign currency contract liabilities, current and long-term	(3,093)	(8,267)
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liabilities	(48,483)	(55,750)
Estimate of Fair Value, Fair Value Disclosure
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contract liabilities, current and long-term	(2,540)	(4,358)
Foreign currency contract assets, current and long-term	2,439	3,078
Foreign currency contract liabilities, current and long-term	(3,093)	(8,267)
Contingent consideration liabilities	$ (48,483)	$ (55,750)