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Summary of significant accounting policies - Concentration Risk (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues $ 2,509,315 $ 2,663,550 $ 2,945,303
United Kingdom | Newsquest      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 239,300    
Foreign Countries | Newsquest      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 182,700    
Foreign Countries | Digital Marketing Solutions      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 40,600    
Long-lived assets $ 5,500