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Employee Benefit Plans - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Jun. 28, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Intrinsic value of options exercised     $ 1,800,000 $ 300,000 $ 300,000
Share-based Payment Arrangement, Expense     $ 12,074,000 17,289,000 16,610,000 [1]
Company discretionary employee match     25.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay     4.00%    
Employer contributions made     $ 300,000 $ 300,000 300,000
Dividend, Share-based Payment Arrangement, Cash     0    
Payments of Dividends     $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0 0  
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employer contributions made     $ 1,000    
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price     $ 5.83 $ 5.76  
Share-based Payment Arrangement, Exercise of Option, Tax Benefit     $ 0 $ 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0    
Fair value of options vested     $ 100,000 $ 700,000 $ 1,700,000
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount     $ 12,700,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     1 year 3 months 26 days    
Performance Shares PRSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     405,261 1,443,168 1,165,685
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     220,261 1,343,168 1,165,685
Share-based Payment Arrangement, Expense     $ 100,000 $ 6,100,000 $ 3,200,000
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     2,717,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     2,421,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 9,700,000 $ 15,600,000 $ 13,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 5.78    
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Price at which stock options or ESPP may be granted     85.00%    
Additional shares authorized     1,000,000    
Common stock reserved for issuance     1,244,992    
ESPP Employee Percentage of Payroll Deductions, Minimum     1.00%    
ESPP Employee Percentage of Payroll Deductions, Maximum     10.00%    
Common stock issued under the 2002 ESPP     1,037,366 1,132,438 1,291,875
Stock contributions value under 2002 ESPP     $ 4,100,000 $ 4,000,000 $ 4,400,000
Discount Percentage On Purchase Of Stock     15.00%    
Value Of Stock Purchase Right Percentage Of Put Option     15.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 1.33 $ 1.33 $ 1.50
1995 Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Price at which stock options or ESPP may be granted     100.00%    
Expiration period     7 years    
Common stock reserved for issuance     9,903,989    
Shares available for grant     4,622,927    
1995 Stock Plan [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     2 years    
1995 Stock Plan [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     4 years    
1995 Stock Plan [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price     $ 0    
Reduced Number Of Shares Reserved For Every Unit Granted     1.5    
Increased Number Of Shares Reserved For Every Unit Forfeited     1.5    
1995 Stock Plan [Member] | Market-based awards [Member] | MRSU 2017 Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       18 months 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       40,000 344,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     110,937    
Share-based Payment Arrangement, Expense       $ 200,000 $ 900,000
1995 Stock Plan [Member] | Market-based awards [Member] | MRSU 2019 Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Awards, Grants in Period, Fair Value $ 1,100,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 200,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     0    
Share-based Payment Arrangement, Expense     $ 300,000 $ 200,000  
Amended 1995 Stock Plan Approved at 2019 Annual Meeting [Member] | Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Additional shares authorized     3,500,000    
Amended 1995 Stock Plan Approved at 2019 Annual Meeting [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Reduced Number Of Shares Reserved For Every Unit Granted     1    
Increased Number Of Shares Reserved For Every Unit Forfeited     1    
2002 Director Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Price at which stock options or ESPP may be granted     100.00%    
Common stock reserved for issuance     650,257    
Shares available for grant     442,918    
2002 Director Plan [Member] | Options and Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Expiration period     7 years    
2002 Director Plan [Member] | Options and Restricted Stock Units [Member] | Subsequent Grants [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year    
2002 Director Plan [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price     $ 0    
Reduced Number Of Shares Reserved For Every Unit Granted     1.5    
Increased Number Of Shares Reserved For Every Unit Forfeited     1.5    
Amended 2002 Director Plan Approved at 2019 Annual Meeting [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Reduced Number Of Shares Reserved For Every Unit Granted     1    
Increased Number Of Shares Reserved For Every Unit Forfeited     1    
TVN [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payment for Pension and Other Postretirement Benefits     $ 0    
Forecast [Member] | TVN [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payment for Pension and Other Postretirement Benefits   $ 0      
[1] For the year ended December 31, 2017, the unallocated corporate expenses included acquisition- and integration-related costs, French VDP costs (see Note 11, “Restructuring and Related charges,” for more information on French VDP) and Cable Access product line inventory obsolescence costs, totaling $7.9 million. In addition, in fiscal 2017, the unallocated corporate expenses included $8.0 million of Avid litigation settlement cost and associated legal fees (see Note 20, “Legal Proceedings,” for more information). The remaining unallocated corporate expenses for all years presented above include primarily other restructuring charges and excess facilities charges.