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Investments and other assets - Narrative (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 31, 2017
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]        
Equity method investments     $ 27,650 $ 41,420
After-tax gain on sale of equity method investment     19,700  
Gain on other equity investment     5,900  
Career Builder        
Schedule of Equity Method Investments [Line Items]        
Equity method investment retained after disposal (as a percent) 17.00%      
Equity method investment retained after disposal, ownership Interest after disposal, diluted (as a percent) 10.00%      
Equity method investments     7,900 $ 12,400
Captivate        
Schedule of Equity Method Investments [Line Items]        
Proceeds from sale of equity method investment   $ 16,200    
Pre-tax gain on sale of equity method investment   12,200    
After-tax gain on sale of equity method investment   $ 9,200    
Other Equity Investments        
Schedule of Equity Method Investments [Line Items]        
Gain on other equity investment     $ 5,900