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Basis of Presentation - Overview (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
restaurant
country
Jul. 01, 2017
USD ($)
restaurant
Dec. 30, 2017
USD ($)
Franchisor Disclosure [Line Items]      
Percentage of Revenue Collected for Advertising Fund 3.00%    
Restricted Cash and Cash Equivalents, Current | $ $ 2,518   $ 2,329
Franchised Units      
Franchisor Disclosure [Line Items]      
Number of Restaurants 1,162 1,035  
Franchised Units | United States      
Franchisor Disclosure [Line Items]      
Number of Restaurants 1,040    
Franchised Units | Non-US      
Franchisor Disclosure [Line Items]      
Number of Restaurants 122    
Number of Countries in which Entity Operates | country 9    
Entity Operated Units      
Franchisor Disclosure [Line Items]      
Number of Restaurants 26 21  
Selling, General and Administrative Expenses      
Franchisor Disclosure [Line Items]      
Franchise Advertising Fund Discretionary Contributions | $ $ 1,900 $ 3,800