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Related party transactions - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
store
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2018
USD ($)
Related Party Transaction [Line Items]        
Due from related parties, current portion $ 0 $ 3,020   $ 3,020
Number of corporate-owned stores utlilizing software | store 35      
Number of franchise stores utlilizing software | store 400      
Board of Directors        
Related Party Transaction [Line Items]        
Ownership percentage 10.50%      
MMC Fox Run, LLC | Consulting Agreement        
Related Party Transaction [Line Items]        
Rent, lease termination costs and termination fee $ 0 898 $ 406  
Direct TSG Investors        
Related Party Transaction [Line Items]        
Liability payable under tax benefit obligations 59,458 44,794    
Area Development Agreements        
Related Party Transaction [Line Items]        
Deferred ADA revenue from related parties $ 779 $ 389