Common Stock Repurchase Programs - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 26, 2017	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015	Jan. 31, 2016	Oct. 14, 2014
Equity, Class of Treasury Stock [Line Items]
Cost of share repurchases	$ 5,014,000		$ 20,700,000
2014 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Amount authorized to be repurchased						$ 30,000,000
Shares repurchased			585,970	1,056,954
Cost of share repurchases			$ 10,300,000	$ 19,600,000
2016 Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Amount authorized to be repurchased					$ 50,000,000
Shares repurchased		215,841	454,718
Cost of share repurchases		$ 5,000,000	$ 10,400,000