Geographic Information - Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 366,965	$ 343,899	$ 1,057,611	$ 1,029,664
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	156,663	146,761	465,919	425,212
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	40,565	35,749	133,773	116,364
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	27,677	37,541	85,048	93,847
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	21,083	16,902	54,105	72,833
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	26,595	9,619	46,334	32,007
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	14,930	17,226	44,220	46,825
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	17,414	18,057	42,016	43,904
Other Europe, Middle East and Africa (EMEA)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	37,314	35,241	107,678	110,330
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 24,724	$ 26,803	$ 78,518	$ 88,342