Business Combinations - Additional Information (Detail) - USD ($) $ in Millions	Aug. 04, 2017	Jun. 15, 2017
Plexistor Limited
Business Acquisition [Line Items]
Business acquisition cash paid		$ 24
Plexistor Limited | Developed Technology
Business Acquisition [Line Items]
Business acquisition cash paid		6
Greenqloud ehf
Business Acquisition [Line Items]
Business acquisition cash paid	$ 51
Greenqloud ehf | Developed Technology
Business Acquisition [Line Items]
Business acquisition cash paid	10
Goodwill | Plexistor Limited
Business Acquisition [Line Items]
Business acquisition cash paid		$ 17
Goodwill | Greenqloud ehf
Business Acquisition [Line Items]
Business acquisition cash paid	$ 38