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Employee Benefit Plans and Stock-based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Jan. 01, 2017
Mar. 31, 2017
Aug. 31, 2016
Apr. 30, 2017
Sep. 29, 2017
Sep. 30, 2016
Sep. 29, 2017
Sep. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Increased Number of Common Shares Reserved for Issuance             7,400,000    
Intrinsic value of options exercised         $ 6,000 $ 100,000 $ 300,000 $ 100,000  
Defined Benefit Plan, Benefit Obligation         5,100,000   5,100,000   $ 4,300,000
Liability, Defined Benefit Pension Plan, Current         55,000   55,000    
Liability, Defined Benefit Pension Plan, Noncurrent         4,956,000   $ 4,956,000    
Discretionary contributions of plan             25.00%    
Percent of employees' gross pay eligible for matching             4.00%    
Maximum contribution amount per participant             $ 1,000    
Contributions in period             326,000 316,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized         13,500,000   $ 13,500,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition             1 year 7 months 17 days    
Total stock-based compensation         3,720,000 2,680,000 $ 11,107,000 8,542,000  
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options         0 $ 0 $ 0 $ 0  
Stock Options [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Volatility           39.00% 43.00% 36.00%  
Risk-free interest rate           1.00% 1.70% 1.40%  
Expected dividends           0.00% 0.00% 0.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value           $ 1.00 $ 1.85 $ 0.97  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value         $ 300,000 $ 400,000 $ 1,400,000 $ 1,800,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures         0        
Performance-based Restricted Stock Units [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     898,533 582,806          
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, Award Vesting Period             3 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized         $ 500,000   $ 500,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition             6 months 21 days    
Volatility   46.70%              
Risk-free interest rate   1.57%              
Expected dividends   0.00%              
Total stock-based compensation         400,000   $ 800,000    
RSUs and 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, Vested in Period, Fair Value         $ 1,900,000 $ 1,600,000 $ 9,200,000 $ 8,600,000  
Employee Stock Purchase Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common Stock, Capital Shares Reserved for Future Issuance         1,114,796   1,114,796    
Discount Percentage On Purchase Of Stock             15.00%    
Percentage of fair market value of Common Stock to purchase shares             85.00%    
Value Of Stock Purchase Right Percentage Of Put Option             15.00%    
Equity Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Increased Number of Common Shares Reserved for Issuance             0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures [1]         0   30,000    
Minimum [Member] | Performance-based Restricted Stock Units [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 months          
Maximum [Member] | Performance-based Restricted Stock Units [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       6 months          
TVN [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Payment for Pension and Other Postretirement Benefits         $ 0        
Stock Plan 1995 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Increased Number of Common Shares Reserved for Issuance         7,000,000        
Stock Plan 1995 [Member] | Employee Stock Purchase Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Increased Number of Common Shares Reserved for Issuance         1,500,000        
Director Option Plans 2002 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Increased Number of Common Shares Reserved for Issuance         400,000        
Accounting Standards Update 2016-09 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock Granted, Value, Share-based Compensation, Forfeited $ 69,000                
[1] Grants of RSUs and any non-statutory stock options issued at prices less than the fair market value on the date of grant decrease the plan reserve 1.5 shares for every unit or share granted and any forfeitures of these awards due to their not vesting would increase the plan reserve by 1.5 shares for every unit or share forfeited.