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Income Taxes - Summary of Differences Between U.S. Federal Statutory Tax Rate and Company's Consolidated Effective Tax Rate (Detail) | 3 Months Ended | 9 Months Ended
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Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
U.S. federal statutory tax rate | 21.00% | 35.00% | 21.00% | 35.00%
State income taxes (net of federal benefit) | (0.60%) | 0.50% | 1.10% | 1.50%
Cessation of operations | 0.00% | 0.00% | (0.90%) | (8.50%)
Research and development credit | (0.30%) | (2.10%) | (0.30%) | (2.20%)
Tax (windfall) shortfall on share-based awards | (3.00%) | (0.90%) | (12.40%) | 0.00%
Tax return adjustments related to the 2017 Tax Act | (3.30%) | 0.00% | (1.30%) | 0.00%
Reserve for uncertain tax positions | (4.60%) | (4.50%) | (1.80%) | (1.70%)
Increase in valuation allowance due to net operating loss | (0.10%) | 1.10% | 0.20% | 3.00%
Impact of Foreign Ops | 4.20% | 0.00% | 3.20% | 0.00%
Other | 1.70% | 1.40% | 1.00% | (0.50%)
Total effective tax rate | 15.00% | 30.50% | 9.80% | 26.60%

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