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Franchise Rights and Goodwill - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Goodwill [Line Items]    
Goodwill acquired during the period $ 5.4 $ 1.2
Lexington Expansion [Member]    
Goodwill [Line Items]    
Goodwill period increase (decrease) 2.3  
Franchise rights increase (decrease) during the period 18.2  
Jackson Territory [Member]    
Goodwill [Line Items]    
Goodwill period increase (decrease) (2.2)  
Franchise rights increase (decrease) during the period $ (11.3)