Restructuring, Acquisition and Integration - Additional Information (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($) Facility	Dec. 31, 2017 USD ($) Facility Employee	Dec. 31, 2016 USD ($) Position	Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 20,930	$ 96,341
Acquisition expense	$ 61,500
Integration, acquisition and restructuring		98,357	158,137	$ 29,277
Ruckus Wireless and ICX Switch business (Ruckus Networks)
Restructuring Cost and Reserve [Line Items]
Acquisition expense		74,500	29,000	25,800
Ruckus Wireless and ICX Switch business (Ruckus Networks) | Broadcom Limited [Member]
Restructuring Cost and Reserve [Line Items]
Cash settlement of stock-based awards	$ 61,500	61,500
Employee severance & termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 13,346	$ 92,246
Total number of positions affected by the restructuring plan		195	1,545
Contractual obligations and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 5,742	$ 3,379
Leased properties, remaining expiration terms		2021
Number of facilities | Facility	3	3
Write-off of property, plant and equipment
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 1,842	716
Integration Related
Restructuring Cost and Reserve [Line Items]
Integration, acquisition and restructuring		$ 2,900	$ 24,200	$ 1,600