Income Taxes - Summary of Differences Between Income Tax Expense Computed at Statutory Federal Income Tax Rate and Per Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax expense at federal rate of 21%									$ 20,711	$ 15,164	$ 19,278
State income taxes, net of federal benefit									321	1,227	5,246
Change in valuation allowance									2,459	(12,760)	12,657
Foreign tax rate differential									(1,809)	(2,535)	(4,796)
Unrecognized tax benefit increase (decrease)									(4,405)	898	1,262
Tax effect of foreign operations									11,373	6,698	8,546
Tax benefit of research & development									(2,173)	(2,506)	(2,557)
Transition tax									0	0	(8,112)
Revaluation of deferred tax balances									0	0	(4,937)
Performance-based compensation									(2,624)	(560)	(4,541)
Other									2,113	(478)	832
Income tax provision	$ 24,261	$ 6,674	$ 5,916	$ (10,885)	$ 35,166	$ 5,136	$ (22,531)	$ (12,623)	$ 25,966	$ 5,148	$ 22,878