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Employee Benefit Plans and Stock-based Compensation - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 09, 2016
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Jul. 01, 2016
USD ($)
Oct. 02, 2015
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Oct. 02, 2015
USD ($)
$ / shares
Dec. 31, 2015
Feb. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase in authorized shares reserved for issuance | shares         2,000,000      
Intrinsic value of options exercised   $ 100,000   $ 0 $ 100,000 $ 1,700,000    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   2.00%     2.00%      
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax   $ 0     $ 0      
Pension and Other Postretirement Benefit Contributions   0            
Defined Benefit Plan, Net Periodic Benefit Cost   99,000     $ 233,000      
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         316,000 $ 342,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 11,700,000     11,700,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   1 year 9 months 18 days            
Defined Benefit Plan, Accumulated Benefit Obligation   $ 5,000,000     $ 5,000,000      
Stock Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares   $ 1.00   $ 2.01 $ 0.97 $ 2.63    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value   $ 400,000   $ 600,000 $ 1,800,000 $ 2,500,000    
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options   0   0 0 0    
Restricted Stock Units (RSUs)                
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   $ 1,600,000   $ 2,200,000 $ 8,600,000 $ 9,900,000    
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, Options, Grants in Period, Net of Forfeitures | shares   898,533            
Employee Stock Purchase Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase in authorized shares reserved for issuance | shares 1,500,000              
Common Stock, Capital Shares Reserved for Future Issuance | shares   906,390     906,390      
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%            
TVN [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Business Combination Assumed Equity Benefit Plan               2
Fair Value of Employee Equity Benefit Plan Liabilities   $ 18,365,000     $ 18,365,000      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   2.00%     2.00%      
TVN [Member] | Maximum [Member] | Restricted Stock Units (RSUs)                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase in authorized shares reserved for issuance | shares         1,750,000      
Scenario, Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Defined Benefit Plan, Settlements, Benefit Obligation         $ 1,600,000      
Assumed Employee Equity Plans [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Other Payments to Acquire Businesses     $ 2,900,000          
Stock Plan 1995 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase in authorized shares reserved for issuance | shares 2,000,000              
Euro Zone AA Rated [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Long-term Euro zone AA rated, Term             10 years  
Long-term Euro zone AA rated 10 years corporate bonds yield             2.00%