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Summary of significant accounting policies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]        
Insurance claim receivables, related party receivables, value-added tax and other tax receivables $ 16,809      
Value added tax and other tax receivable   $ 16,215    
Tangible asset impairment charges 18,950 17,564 $ 7,697  
Accounts payable for outsourcing 4,014 2,117    
Sale of properties, equipment and restaurant businesses 8,184 107,867 71,712  
Company-operated restaurants        
Summary Of Significant Accounting Policies [Line Items]        
Advertising expense 120,839 130,277 117,250  
Franchised operations        
Summary Of Significant Accounting Policies [Line Items]        
Advertising expense $ 43,940 $ 46,536 $ 36,374  
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 12 years      
Accounting Standards Update 2016-02 | Subsequent Event | Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Right-of-use asset       $ 860,000
Lease liabilities       860,000
Accounting Standards Update 2016-02 | Subsequent Event | Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Right-of-use asset       920,000
Lease liabilities       $ 920,000