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Taxes (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016	Dec. 31, 2016
Income Tax Contingency [Line Items]
Income tax provision at federal statutory corporate tax rate	35.00%	35.00%	35.00%	35.00%
Decrease in effective tax rate	18.00%	17.00%	18.00%	17.00%
Decrease in effective tax rate for difference between deduction for tax purposes and compensation cost recognized from stock option exercises	7.00%	11.00%	13.00%	6.00%
Increase in reserves for income taxes, net of deferred tax benefit	$ 201,000		$ 201,000
Interest and penalties included in reserve			22,000
Liability for uncertain tax positions	6,591,000		6,591,000
Reserve for income taxes classified as a noncurrent iability	5,563,000		5,563,000		$ 5,361,000
Reserve for income taxes classified an noncurrent deferred tax assets	1,028,000		1,028,000
Interest and penalties, gross	$ 701,000		701,000
Minimum decrease in income tax expense due to release in reserves			1,000,000
Maximum decrease in income tax expense due to release in reserves			$ 1,200,000
Tax years open to examination by Internal Revenue Service			2014 through 2016
Tax years open to examination by various taxing authorities for other entities			2013 through 2016
Foreign Tax Authority | Revenue Commissioners, Ireland
Income Tax Contingency [Line Items]
Income tax provision at federal statutory corporate tax rate			12.50%
Foreign Tax Authority | State Administration of Taxation, China
Income Tax Contingency [Line Items]
Income tax provision at federal statutory corporate tax rate			25.00%
Domestic Tax Authority
Income Tax Contingency [Line Items]
Income tax provision at federal statutory corporate tax rate			35.00%

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