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Investments and other assets - Narrative (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 14, 2018
Jul. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]          
Equity method investments     $ 22,960 $ 27,098  
Proceeds from sale of equity method investments     13,500 25,800  
Equity earnings from equity method investment     13,792 10,402 $ (3,414)
Cost method investments     24,500 $ 17,400  
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     12,400    
Proceeds from sale of equity method investments $ 9,900        
Pre-tax gain on sale of equity method investment $ 17,900        
Equity earnings from equity method investment     $ 14,200