Employee Benefit Plans and Stock-based Compensation - Additional Information (Detail) - USD ($) shares in Thousands	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 0	$ 0
Defined Benefit Plan, Benefit Obligation	4,900,000		$ 4,900,000
Liability, Defined Benefit Pension Plan, Current	100,000
Liability, Defined Benefit Pension Plan, Noncurrent	$ 4,800,000
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	122,000	$ 112,000
Dividends, Share-based Compensation, Cash	$ 0
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	800
Discount Percentage On Purchase Of Stock	15.00%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	4,800
Grants in Period, Number of Shares	0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 6,900,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 5 months 9 days
TVN [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payment for Pension and Other Postretirement Benefits	$ 0
Call Option [Member] | Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of fair market value of Common Stock to purchase shares	85.00%
Put Option [Member] | Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of fair market value of Common Stock to purchase shares	15.00%