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Summary of significant accounting policies - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]        
Insurance claim receivables, related party receivables, value-added tax and other tax receivables $ 10,110      
Value added tax and other tax receivable   $ 17,046    
Accounts payable for outsourcing 13,354 8,896    
Sale of properties, equipment and restaurant businesses 201 6,415 $ 8,184  
Lease right of use asset, net 790,969 922,165   $ 896,682
Operating lease liability 809,441      
Company-operated Restaurants        
Summary Of Significant Accounting Policies [Line Items]        
Advertising expense 60,855 115,568 120,839  
Franchised Operations        
Summary Of Significant Accounting Policies [Line Items]        
Advertising expense $ 26,486 43,039 $ 43,940  
Internal Used Software        
Summary Of Significant Accounting Policies [Line Items]        
Finite-lived intangible asset, useful life 3 years      
Minimum | Equipment        
Summary Of Significant Accounting Policies [Line Items]        
Property and equipment, useful life 3 years      
Maximum | Building        
Summary Of Significant Accounting Policies [Line Items]        
Property and equipment, useful life 40 years      
Maximum | Equipment        
Summary Of Significant Accounting Policies [Line Items]        
Property and equipment, useful life 10 years      
ASC 842        
Summary Of Significant Accounting Policies [Line Items]        
Lease right of use asset, net   $ 922,165   913,000
Operating lease liability       $ 913,000