Summary of Significant Accounting Policies - Additional Information (Details)				1 Months Ended	12 Months Ended
	Jul. 02, 2020 USD ($)	Jul. 19, 2018 USD ($)	Jul. 05, 2011 patent	Jul. 31, 2015 patent	Dec. 31, 2020 USD ($) Reporting_Unit	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2017 USD ($)
Significant Accounting Policies [Line Items]
Amount of inventory as a percentage of prior year purchases that can be returned by certain distributors					3.00%
Unprocessed adjustments recognized against gross accounts receivables					$ 25,500,000	$ 29,500,000
Unprocessed adjustments recognized against accounts accrued liabilities					13,000,000.0	11,000,000.0
Bad debt expense, net of recoveries					2,400,000	100,000	$ 200,000
Allowance for doubtful accounts					5,100,000	2,600,000
Obsolescence and other reserves					$ 32,269,000	21,245,000
Number of reporting units used in quantitative assessment | Reporting_Unit					10
Goodwill impairment loss					$ 0	0	0
Gain on disposal					(9,948,000)	0	0
Accumulated other comprehensive losses recognized as result of sale of equity method investment					191,851,000	63,418,000
Proceeds from disposal of business, net of cash sold					54,821,000	0	40,171,000
Accrued sales rebates					32,192,000	37,170,000
Gain from patent litigation					0	0	62,141,000
Advertising costs					11,600,000	14,700,000	17,000,000.0
Valuation allowances					84,308,000	48,251,000
Cumulative effect of change in accounting principle					(757,051,000)	(965,819,000)	(1,387,588,000)		$ (1,434,866,000)
Net Operating Losses, Capital Losses and Foreign Tax Credits
Significant Accounting Policies [Line Items]
Valuation allowances					84,300,000
Retained Earnings
Significant Accounting Policies [Line Items]
Cumulative effect of change in accounting principle					(450,876,000)	(518,004,000)	(922,000,000)		(833,610,000)
Cumulative Effect, Period of Adoption, Adjustment
Significant Accounting Policies [Line Items]
Cumulative effect of change in accounting principle						2,916,000	29,041,000
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Significant Accounting Policies [Line Items]
Cumulative effect of change in accounting principle						2,916,000	29,041,000	$ 2,900,000
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | Continuing Operations
Significant Accounting Policies [Line Items]
Cumulative effect of change in accounting principle								1,000,000.0
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | Discontinued Operations
Significant Accounting Policies [Line Items]
Cumulative effect of change in accounting principle								1,900,000
Subsidiaries | Corning
Significant Accounting Policies [Line Items]
Number of patents allegedly infringed upon | patent			2
Proceeds from settlement		$ 62,100,000
Number of patents found infringed upon | patent				2
Grass Valley
Significant Accounting Policies [Line Items]
Impairment of the disposal group					113,000,000.0	521,400,000
Grass Valley | Discontinued Operations, Disposed of by Sale
Significant Accounting Policies [Line Items]
Proceeds from disposal of business, net of cash sold	$ 56,200,000
Grass Valley | Discontinued Operations, Held-for-sale
Significant Accounting Policies [Line Items]
Goodwill impairment loss						326,100,000
Impairment of the disposal group					113,007,000	$ 521,441,000	0
Previously Closed Operating Facility | Discontinued Operations, Disposed of by Sale
Significant Accounting Policies [Line Items]
Disposition, sales price					2,100,000		1,500,000
Gain on disposal					$ 400,000		600,000
Hirschmann Jv | Discontinued Operations, Held-for-sale
Significant Accounting Policies [Line Items]
Disposition, sales price									$ 40,200,000
Proceeds from disposal of business, net of cash sold							$ 40,200,000
Minimum
Significant Accounting Policies [Line Items]
Estimated useful life of definite-lived intangible assets					1 year
Maximum
Significant Accounting Policies [Line Items]
Estimated useful life of definite-lived intangible assets					25 years
Buildings | Minimum
Significant Accounting Policies [Line Items]
Estimated useful life of property, plant, and equipment					10
Buildings | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life of property, plant, and equipment					40 years
Machinery and equipment | Minimum
Significant Accounting Policies [Line Items]
Estimated useful life of property, plant, and equipment					5
Machinery and equipment | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life of property, plant, and equipment					12 years
Computer Equipment and Software | Minimum
Significant Accounting Policies [Line Items]
Estimated useful life of property, plant, and equipment					5
Computer Equipment and Software | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life of property, plant, and equipment					10 years
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | Continuing Operations
Significant Accounting Policies [Line Items]
Cumulative effect of change in accounting principle								1,000,000.0
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | Discontinued Operations
Significant Accounting Policies [Line Items]
Cumulative effect of change in accounting principle								$ 1,900,000
Hirschmann Jv
Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage									50.00%