Taxes (Detail) - USD ($)	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	(16.00%)	15.00%
Increase in reserves for income taxes, net of deferred tax benefit	$ 246,000
Interest and penalties included in reserve	36,000
Liability for uncertain tax positions	6,669,000
Reserve for income taxes classified as a noncurrent iability	5,641,000		$ 5,361,000
Reserve for income taxes classified an noncurrent deferred tax assets	1,028,000
Interest and penalties, gross	730,000
Minimum decrease in income tax expense due to release in reserves	800,000
Maximum decrease in income tax expense due to release in reserves	$ 900,000
Tax years open to examination by Internal Revenue Service	2013 through 2016
Tax years open to examination by various taxing authorities for other entities	2012 through 2016