Property and Equipment - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 30, 2015	Dec. 31, 2014	Dec. 25, 2013
Property Plant And Equipment [Abstract]
Depreciation expense	$ 13,100,000	$ 11,500,000	$ 10,200,000
Gross value of assets under capital leases for buildings and improvements	1,559,200	1,800,800
Accumulated depreciation of assets under capital leases	1,470,000	1,673,000
Capital expenditures	23,700,000	23,700,000
Capital expenditures for restaurant remodeling	6,300,000	7,400,000
Capital expenditures for new restaurants	$ 17,400,000	$ 16,300,000