Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 317,130	$ 282,873
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	140,662	98,765
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	33,573	30,601
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	30,427	45,538
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	15,609	16,552
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	15,078	15,054
Other Europe, Middle East and Africa (EMEA)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	44,255	43,018
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 37,526	$ 33,345