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Sale and Closure of Company-Owned Stores - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 30, 2018
USD ($)
Store
Dec. 31, 2017
USD ($)
Store
Jan. 01, 2017
USD ($)
Store
Sales Concentration [Line Items]      
Number of company-owned stores sold | Store 12 17  
Pre-tax gain on sale of assets, net of goodwill reduction, charged to general and administrative expenses $ 5,900 $ 4,000  
Reduction of goodwill related to sale of stores 400 600  
Proceeds from sale of assets 8,367 6,835 $ 4,936
Number of stores closed | Store     1
Reduction of goodwill related to restructuring     $ 100
Franchisee [Member]      
Sales Concentration [Line Items]      
Pre-tax gain on sale of assets, net of goodwill reduction, charged to general and administrative expenses 100    
Reduction of goodwill related to sale of stores 100    
Proceeds from sale of assets $ 300    
Number of stores closed | Store 2    
Discontinued Operations Disposed of by Sale Two Thousand Seventeen [Member]      
Sales Concentration [Line Items]      
Proceeds from sale of assets   $ 6,800  
Discontinued Operations Disposed of by Sale Two Thousand Eighteen [Member]      
Sales Concentration [Line Items]      
Proceeds from sale of assets $ 7,900