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Summary of significant accounting policies - Effect of Topic 606 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Jan. 01, 2018
Dec. 31, 2017
Balance Sheet            
Deferred income taxes $ 55,567 $ 68,368 $ 58,334   $ 75,854  
Accrued payroll and other liabilities - current 79,218 86,379 94,166   119,427  
Accrued payroll and other liabilities - non-current 21,884 23,497 35,322 $ 18,918 34,378  
Retained earnings 290,895 471,149 413,074   397,338  
Income Statement            
Revenues from franchised restaurants 1,984,219 2,959,077 3,081,571      
Income tax expense (17,532) (38,837) (48,136)      
Revenues from franchised restaurants            
Income Statement            
Revenues from franchised restaurants $ 89,601 $ 146,790 148,962      
Balances Without Adoption of ASC 606            
Balance Sheet            
Deferred income taxes     56,522      
Accrued payroll and other liabilities - current     93,770      
Accrued payroll and other liabilities - non-current     29,495      
Retained earnings     417,485      
Income Statement            
Income tax expense     (48,393)      
Balances Without Adoption of ASC 606 | Revenues from franchised restaurants            
Income Statement            
Revenues from franchised restaurants     149,834      
Previously Reported            
Balance Sheet            
Deferred income taxes           $ 74,299
Accrued payroll and other liabilities - current           119,088
Accrued payroll and other liabilities - non-current     35,322     29,366
Retained earnings           401,134
Accounting Standards Update 2014-09 | Effect of Change            
Balance Sheet            
Deferred income taxes     1,812      
Accrued payroll and other liabilities - current     396      
Accrued payroll and other liabilities - non-current     5,827      
Retained earnings     (4,411)      
Income Statement            
Income tax expense     257      
Accounting Standards Update 2014-09 | Effect of Change | Revenues from franchised restaurants            
Income Statement            
Revenues from franchised restaurants     $ (872)      
Accounting Standards Update 2014-09 | Restatement Adjustment            
Balance Sheet            
Deferred income taxes         $ 1,555 1,555
Accrued payroll and other liabilities - current           339
Accrued payroll and other liabilities - non-current           5,012
Retained earnings           $ (3,796)