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Information about Geographic Areas and Products - Revenues by Geographic Area (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Revenues $ 1,933,026 $ 1,390,513 $ 1,005,480
Revenues by geography      
Percentage of U.S. revenues in North America 94.00% 95.00% 95.00%
North America      
Segment Reporting Information [Line Items]      
Revenues $ 1,299,950 $ 946,956 $ 702,985
EMEA      
Segment Reporting Information [Line Items]      
Revenues 478,686 339,341 233,378
Asia Pacific and other      
Segment Reporting Information [Line Items]      
Revenues $ 154,390 $ 104,216 $ 69,117