Property and Equipment - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 23, 2020 USD ($)	Sep. 25, 2019 USD ($)	Sep. 23, 2020 USD ($) restaurant	Sep. 25, 2019 USD ($) restaurant
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 4,100	$ 4,300	$ 12,600	$ 13,600
Impairment of property and equipment			3,478	283
California
Property, Plant and Equipment [Line Items]
Impairment of property and equipment	$ 1,500	$ 100	$ 2,900	$ 300
Number of restaurants primarily responsible for impairment | restaurant			4	1