Taxes - Reconciliation of United States Federal Statutory Corporate Tax Rate to Company's Effective Tax Rate, or Income Tax Provision (Detail)	3 Months Ended
Mar. 31, 2019	Apr. 01, 2018
Income Tax Disclosure [Abstract]
Income tax expense at U.S federal statutory corporate tax rate	21.00%	21.00%
State income taxes, net of federal benefit	1.00%	1.00%
Foreign tax rate differential	(9.00%)	(7.00%)
Tax credit	(0.00%)	(1.00%)
Discrete tax benefit related to stock option exercises	8.00%	13.00%
Other discrete tax events	0.00%	0.00%
Other	2.00%	1.00%
Income tax expense	7.00%	2.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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