Taxes (Detail) - USD ($)	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015	Dec. 31, 2015
Proceeds and Excess Tax Benefit from Share-based Compensation	$ 463,000
Decrease in tax expense from expiration of statues of limitations		$ 364,000
Increase in reserves for income taxes, net of deferred tax benefit	375,000
Interest and penalties included in reserve	51,000
Liability for uncertain tax positions	6,260,000
Reserve for income taxes classified as a noncurrent iability	5,233,000		$ 4,830,000
Reserve for income taxes classified an noncurrent deferred tax assets	1,027,000
Interest and penalties, gross	631,000
Reserve for income taxes to be recorded in additional paid in capital	700,000
Minimum decrease in income tax expense due to release in reserves	750,000
Maximum decrease in income tax expense due to release in reserves	$ 850,000
Tax years open to examination by Internal Revenue Service	2012 through 2015
Tax years open to examination by various taxing authorities for other entities	2011 through 2015
SISD | Discontinued Operations, Disposed of by Sale
Tax Expense on gain of Discontinued Operation	$ 0	$ 523,000