Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 282,873	$ 253,405
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	98,765	99,768
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	45,538	25,116
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	30,601	31,472
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	16,552	12,190
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	15,054	13,669
Other EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	43,018	36,539
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	33,345	$ 34,651
Previous Accounting Guidance
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	284,569
Previous Accounting Guidance | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	108,586
Previous Accounting Guidance | Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	33,389
Previous Accounting Guidance | Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	34,412
Previous Accounting Guidance | France
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	15,796
Previous Accounting Guidance | South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	15,555
Previous Accounting Guidance | Other EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	42,484
Previous Accounting Guidance | Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 34,347