Common Stock Dividends Declared And Paid Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended							9 Months Ended	12 Months Ended
	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Sep. 30, 2016	Jan. 01, 2016
Class of Stock [Line Items]
Dividends Per Share	$ 0.18	$ 0.18	$ 0.18	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.54	$ 0.60
Amount	$ 4,659	$ 4,675	$ 4,628	$ 3,867	$ 3,870	$ 3,887	$ 3,858	$ 13,962	$ 15,482