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Employee Benefit Plans - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Jan. 01, 2017
Jun. 09, 2016
Sep. 29, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Additional shares authorized       7,400,000    
Shares available for grant       9,004,000 3,912,000  
Intrinsic value of options exercised       $ 300,000 $ 100,000 $ 1,700,000
Allocated Share-based Compensation Expense       16,610,000 [1] 13,060,000 15,582,000
Payment for Pension and Other Postretirement Benefits         0  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment [2]       0 1,955,000  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment       $ 0 1,955,000  
Net Accumulated Gain or Loss as a Percentage of Projected Plan Benefit Obligation       10.00%    
Company discretionary employee match       25.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay       4.00%    
Employer contributions made       $ 300,000 $ 400,000 $ 400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized       $ 9,900,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 4 months 8 days    
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       $ 6.04 $ 6.01  
Dividend yield       0.00% 0.00% 0.00%
Weighted-average fair value per share of option granted       $ 1.85 $ 0.99 $ 2.51
Fair value of options vested       $ 1,700,000 $ 2,300,000 $ 3,000,000
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options       $ 0 $ 0 $ 0
Performance Shares [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       1,165,685 898,533 395,760
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       1,165,685 610,579 239,744
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number       0    
Allocated Share-based Compensation Expense       $ 3,200,000 $ 2,800,000 $ 600,000
Market-based awards [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       344,500    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       0    
Allocated Share-based Compensation Expense       $ 900,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options       $ 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       3,546,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       3,184,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number       2,904,000 3,864,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 5.12    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value       $ 13,000,000 $ 9,700,000 $ 11,100,000
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%    
Common stock reserved for issuance       1,114,796    
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       1,291,875 1,265,458 888,152
Stock contributions value under 2002 ESPP       $ 4,400,000 $ 3,700,000 $ 5,200,000
Discount Percentage On Purchase Of Stock       15.00%    
Value Of Stock Purchase Right Percentage Of Put Option       15.00%    
Dividend yield       0.00% 0.00% 0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 1.50 $ 1.04 $ 1.69
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    
Reduced the number of shares reserved for every unit granted       1.5    
Increased number of shares reserved for every unit forfeited       1.5    
Additional shares authorized   7,000,000        
Common stock reserved for issuance       14,858,418    
Shares available for grant       8,381,707    
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] | Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Price at which stock options or ESPP may be granted       85.00%    
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    
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%    
Reduced the number of shares reserved for every unit granted       1.5    
Increased number of shares reserved for every unit forfeited       1.5    
Additional shares authorized     400,000      
Common stock reserved for issuance       837,174    
Shares available for grant       623,034    
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    
Assumed Employee Equity Plans [Member] | TVN [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Acquisition Consideration, Assumed Existing Employee Equity Benefit Plans Fully Vested and Settled         $ 2,900,000  
Cost of Sales [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated Share-based Compensation Expense       $ 2,370,000 $ 1,554,000 $ 1,862,000
Cost of Sales [Member] | TVN [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment       600,000    
Restructuring Charges [Member] | TVN [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment       $ 1,400,000    
Accounting Standards Update 2016-09 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Cumulative Effect on Retained Earnings, Net of Tax $ 69,000          
[1] For the years ended December 31, 2017 and 2016, the unallocated corporate expenses included TVN acquisition- and integration-related costs, TVN VDP costs (see Note 10, “Restructuring and Related charges-TVN VDP,” for more information on TVN VDP ) and Cable Edge product line inventory obsolescence costs, totaling $7.9 million and $32.2 million, respectively. In addition, in fiscal year 2017, the unallocated corporate expenses included $8.0 million of Avid litigation settlement cost and associated legal fees (see Note 19, “Legal Proceedings,” for more information). The remaining unallocated corporate expenses for all years presented above include primarily other restructuring charges and excess facilities charges.
[2] As a result of the TVN VDP, the defined benefit pension plan was remeasured in the fourth quarter of 2016, which resulted in a non-cash curtailment gain of $2.0 million. The curtailment gain was recognized in the Consolidated Statement of Operations during the fourth quarter of 2016 and the Company’s pension liability was reduced by the same amount. Of the $2.0 million pension curtailment gain, $0.6 million is included in product cost of revenue and the remaining $1.4 million is included in operating expenses-restructuring and related charges in the Consolidated Statement of Operations. The remeasurement did not have a material effect on other components of net periodic pension expense for the year ended December 31, 2016.