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Discontinued Operations - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 02, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Goodwill impairment loss |  |  | $ 0 | $ 0 | $ 0
Proceeds from disposal of business, net of cash sold |  |  | 54,821,000 | 0 | 40,171,000
Depreciation and amortization |  |  | 0.0 | 23,700,000 | 35,100,000
Capital expenditure |  |  | 16,700,000 | 29,400,000 | 22,600,000
Share-based compensation expense |  |  | (900,000) | 900,000 | 1,400,000
Accumulated other comprehensive income (loss), net of tax |  |  |  | 42,300,000 |
Discontinued Operations, Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of the disposal group |  |  |  | 179,300,000 |
Translation exchange rates |  |  |  | 180,400,000 |
Discontinued Operations, Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Loss on sale, discontinued operations | $ 9,900,000 |  |  |  |
Tax effect of discontinued operation | 7,500,000 |  |  |  |
Grass Valley |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of the disposal group |  |  | 113,000,000.0 | 521,400,000 |
Equity interest in divested business | $ 3,000,000.0 |  |  |  |
Equity interest in divested business, percentage | 9.00% |  |  |  |
Proceeds from sale of equity interest under cost method |  | $ 2,700,000 |  |  |
Accrued interest |  | 7,800,000 |  |  |
Revenues |  | $ 2,000,000.0 |  |  |
Grass Valley | Discontinued Operations, Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of the disposal group |  |  | 113,007,000 | 521,441,000 | 0
Goodwill impairment loss |  |  |  | 326,100,000 |
Impairment of the disposal group |  |  | 179,300,000 |  |
Translation exchange rates |  |  | 180,400,000 |  |
Revenues |  |  | 109,195,000 | 360,496,000 | $ 419,666,000
Grass Valley | Discontinued Operations, Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from divestiture of businesses | $ 120,000,000.0 |  |  |  |
Proceeds from disposal of business, net of cash sold | 56,200,000 |  |  |  |
Deferred consideration - seller's note | 175,000,000.0 |  |  |  |
Paid-in-kind interest | 88,000,000 |  |  |  |
Deferred compensation - earnout payments | 178,000,000.0 |  |  |  |
Fair value of debt instrument | $ 34,900,000 |  |  |  |
Payment in kind, annual interest rate | 0.085 |  |  |  |
Customer relationships | Discontinued Operations, Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of intangible assets |  |  |  | 14,400,000 |
Customer relationships | Grass Valley | Discontinued Operations, Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of intangible assets |  |  | 14,400,000 |  |
Trademarks | Discontinued Operations, Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of intangible assets |  |  |  | $ 1,600,000 |
Trademarks | Grass Valley | Discontinued Operations, Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of intangible assets |  |  | $ 1,600,000 |  |

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