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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% |  |

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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as current. Excludes other postretirement benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919 + Details
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