Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue, Major Customer [Line Items]
Net sales		$ 1,651,248	$ 1,728,524	$ 4,955,498	$ 4,875,799
Operating Segments | CPE
Revenue, Major Customer [Line Items]
Net sales		941,469	1,174,750	2,824,827	3,385,689
Operating Segments | CPE | Broadband
Revenue, Major Customer [Line Items]
Net sales		448,518		1,176,886
Operating Segments | CPE | Video
Revenue, Major Customer [Line Items]
Net sales		492,951		1,647,941
Operating Segments | N&C
Revenue, Major Customer [Line Items]
Net sales		532,035	556,863	1,619,795	1,498,271
Operating Segments | N&C | Networks
Revenue, Major Customer [Line Items]
Net sales		458,303		1,390,690
Operating Segments | N&C | Software And Services
Revenue, Major Customer [Line Items]
Net sales		73,732		229,105
Operating Segments | Enterprise
Revenue, Major Customer [Line Items]
Net sales		180,159	$ 0	522,313	$ 0
Operating Segments | Other
Revenue, Major Customer [Line Items]
Net sales	[1]	$ (2,415)		$ (11,437)

[1] Adjustments include acquisition accounting impacts related to deferred revenue.