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Acquisition - Summary of Business Combination and Allocated the Purchase Consideration to Assets Acquired and Liabilities Assumed Based on Estimated Fair Values (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Oct. 23, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 950,572		$ 812,012
Dome9 Security Ltd
Business Acquisition [Line Items]
Goodwill		$ 138,560
Core technology		26,958
Net liabilities assumed		(4,498)
Total		$ 161,020

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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