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Goodwill and other intangible assets - Narrative (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Finite-Lived Intangible Assets    
Impairment of I intangible assets excluding goodwill $ 23,000  
Goodwill impairment   $ 362,350
Domestic Publishing    
Finite-Lived Intangible Assets    
Impairment of finite lived intangible assets   4,000
Goodwill impairment 256,500  
Newspaper Reporting Unit    
Finite-Lived Intangible Assets    
Impairment of finite lived intangible assets   $ 4,000
Goodwill impairment 65,400  
Marketing Solutions    
Finite-Lived Intangible Assets    
Goodwill impairment $ 40,500  
Measurement Input, Long-term Revenue Growth Rate | Minimum    
Finite-Lived Intangible Assets    
Intangible assets measurement inputs (percent)   (0.50%)
Measurement Input, Long-term Revenue Growth Rate | Maximum    
Finite-Lived Intangible Assets    
Intangible assets measurement inputs (percent)   3.00%
Measurement Input, Discount Rate | Minimum    
Finite-Lived Intangible Assets    
Intangible assets measurement inputs (percent)   10.00%
Measurement Input, Discount Rate | Maximum    
Finite-Lived Intangible Assets    
Intangible assets measurement inputs (percent)   15.50%