v3.8.0.1
Organization and Other Matters - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2016
USD ($)
Sep. 24, 2017
USD ($)
State
JointVenture
Sep. 24, 2017
USD ($)
State
Subsidiary
JointVenture
Sep. 25, 2016
USD ($)
Dec. 25, 2016
USD ($)
Nature Of Business And Basis Of Presentation [Line Items]          
Number of states with operations | State   31 31    
Purchase price of transitioned franchise shop $ 1,100     $ 1,108  
Goodwill   $ 2,222 $ 2,222   $ 2,222
Number of wholly owned subsidiaries | Subsidiary     8    
Number of joint ventures | JointVenture   5 5    
Term of breakage recognized after sale     2 years    
Additional income tax expense (benefit)     $ 292 $ (24)  
ASU No. 2016-09 [Member]          
Nature Of Business And Basis Of Presentation [Line Items]          
Additional income tax expense (benefit)   $ 45 $ 292    
Minimum [Member]          
Nature Of Business And Basis Of Presentation [Line Items]          
Ownership interest rate     51.00%    
Maximum [Member]          
Nature Of Business And Basis Of Presentation [Line Items]          
Ownership interest rate     80.00%    
Franchise-Operated Shops [Member]          
Nature Of Business And Basis Of Presentation [Line Items]          
Goodwill $ 800