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Summary of Differences Between US Federal Statutory Tax Rate and Company's Consolidated Effective Tax Rate (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Income Tax Disclosure [Abstract]        
US federal statutory tax rate 35.00% 35.00% 35.00% 35.00%
State income taxes (net of federal benefit) 0.50% 0.00% 1.50% 0.00%
Cessation of Spanish operations 0.00% 0.00% (8.50%) 0.00%
Research and development credit (2.10%) (39.60%) (2.20%) (24.00%)
Tax (windfall) shortfall on share-based awards (0.90%) 0.00% 0.00% 0.00%
Reserves for uncertain tax positions (4.50%) 7.40% (1.70%) 5.20%
Out-of-period adjustments 0.00% 7.00% 0.00% 4.00%
Increase (decrease) in valuation allowance 1.10% 0.00% 3.00% (3.80%)
Other 1.40% 0.50% (0.50%) 2.20%
Effective Tax Rate 30.50% 10.30% 26.60% 18.60%