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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Jan. 01, 2017
USD ($)
Mar. 30, 2018
USD ($)
Dec. 31, 2014
USD ($)
segment
Dec. 31, 2017
USD ($)
Customer
segment
Dec. 31, 2016
USD ($)
Customer
Dec. 31, 2015
USD ($)
Sep. 29, 2017
USD ($)
Mar. 31, 2017
USD ($)
Cash and cash equivalents maximum maturity       3 months 3 months 3 months    
Restricted Cash       $ 1,700,000 $ 1,800,000 $ 1,100,000    
Restricted Cash, Current [1]       530,000 731,000      
Short-term investments       0 6,923,000      
Cost Method Investments, Carrying Value       3,600,000 4,400,000      
Cash and cash equivalents     $ 73,032,000 57,024,000 55,635,000 126,190,000    
Accounts receivable, net       69,844,000 86,765,000      
Debt Instrument, Face Amount       $ 128,250,000 $ 128,250,000      
Debt Instrument, Interest Rate, Stated Percentage       4.00% 4.00%      
Debt and Capital Lease Obligations       $ 22,946,000 $ 21,190,000      
Number Of Customers Accounting For More Than Ten Percent of Revenue | Customer       0        
Revenue recognition period, associated with service and maintenance agreement       1 year        
Capitalized Software Development Costs for Software Sold to Customers       $ 1,100,000        
Goodwill       $ 242,827,000 237,279,000 197,781,000    
Number of reporting units       2        
Goodwill, Impairment Loss       $ 0 0 0    
Impairment of Intangible Assets, Finite-lived       0 0 0    
Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net       0        
Research and Development Expense       95,978,000 98,401,000 87,545,000    
Reimbursements of Engineering Spending       6,000,000 6,000,000      
Advertising expense       $ 700,000 1,400,000 1,400,000    
Net Accumulated Gain or Loss as a Percentage of Projected Plan Benefit Obligation       10.00%        
More Likely Than Not Threshold Recognition of Uncertain Tax Position       50.00%        
Number of reportable segments | segment     2 2        
Goodwill, Acquired During Period         $ 41,670,000      
Discount rate       1.50% 1.50%      
Defined Benefit Plan, Benefit Obligation       $ 5,033,000 $ 4,264,000 0    
Deferred Tax Assets, Net       10,462,000 10,181,000      
Deferred Tax Assets, Valuation Allowance     $ 75,199,000 $ 77,756,000 $ 74,480,000 $ 64,545,000    
Furniture and Fixtures [Member]                
Property, plant and equipment estimated useful life       5 years        
Internal Use Software [Member]                
Property, plant and equipment estimated useful life       3 years        
Machinery and Equipment [Member]                
Property, plant and equipment estimated useful life       4 years        
Leasehold Improvements [Member]                
Property, plant and equipment estimated useful life       10 years        
Property, plant and equipment leasehold improvements useful lives       shorter of the remaining useful lives of the assets, up to 10 years, or the lease term of the respective assets        
Forward Contracts [Member]                
Derivative, Term of Contract       12 months        
Software [Member]                
Property, plant and equipment estimated useful life       3 years        
Accounts Receivable [Member]                
Number of significant customers for accounts receivable | Customer       0 0      
Entity-wide revenue, major customer, revenue or accounts receivable percentage       10.00% 10.00%      
Net Revenue [Member]                
Entity-wide revenue, major customer, revenue or accounts receivable percentage       10.00%        
Number Of Customers Accounting For More Than Ten Percent of Revenue | Customer       0 0      
Net Revenue [Member] | Comcast [Member]                
Entity-wide revenue, major customer, revenue or accounts receivable percentage           12.00%    
TVN [Member]                
Goodwill         $ 41,670,000      
R&D Tax Credits       $ 5,900,000 6,100,000 $ 0    
Other Expense [Member]                
Remeasurement Losses, Reporting Currency Denominated, Value       2,200,000 200,000 $ 500,000    
Other Assets [Member]                
Restricted Cash and Investments, Noncurrent       1,200,000 $ 1,100,000      
Accounting Standards Update 2016-09 [Member]                
Cumulative Effect on Retained Earnings, Net of Tax $ 69,000              
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]                
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income 0              
Accounting Standards Update 2016-09 [Member] | Deferred Tax Assets Gross [Member]                
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income 4,600,000              
Accounting Standards Update 2016-16 [Member]                
Cumulative Effect on Retained Earnings, Net of Tax 1,434,000              
Deferred Tax Assets, Net               $ 1,100,000
Deferred Tax Assets, Valuation Allowance               2,100,000
Deferred Tax Assets, Tax Deferred Expense               $ 300,000
Silicon Valley Bank [Member] | Revolving Credit Facility [Member]                
Line of Credit Facility, Current Borrowing Capacity       $ 15,000,000     $ 15,000,000  
Subsequent Event [Member]                
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit   $ 0            
Cash Flow Hedging [Member] | Forward Contracts [Member] | Designated as Hedging Instrument [Member]                
Derivative, Term of Contract       12 months        
Valuation Allowance of Deferred Tax Assets [Member] | Accounting Standards Update 2016-09 [Member]                
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income $ 4,600,000              
[1] The restricted cash balances are held as cash collateral security for certain bank guarantees. These restricted funds are invested in bank deposits and cannot be withdrawn from the Company’s accounts without the prior written consent of the applicable secured party. Additionally, as of December 31, 2017, the Company had approximately $1.2 million of restricted cash for the bank guarantee associated with the TVN French Subsidiary’s office building lease. This amount is reported under “Other Long-term Assets” on the Company’s Consolidated Balance Sheets.