Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2018	Mar. 29, 2017	Dec. 27, 2017
Property, Plant and Equipment [Abstract]
Depreciation	$ 4,200	$ 4,300
Gross value of assets under capital leases for buildings and improvements	1,600		$ 1,600
Accumulated depreciation of assets under capital leases	$ 1,500		$ 1,500