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Fair value measurement - Narrative (Detail)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
investment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Cost method investments $ 17,374     $ 17,374 $ 24,497 $ 17,374  
Impairment charge to cost method investments 2,600     2,600 $ 2,000 2,600  
Non-cash goodwill impairment charge     $ 332,900       $ 15,200
Pre-tax impairments on equity method investments           5,800  
Hedge funds redemption period         95 days    
Future funding commitments         $ 700    
Hedge funds redemption potential holdback percentage         5.00%    
Level 1              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Deferred compensation investments 14,600     14,600   14,600  
Common collective trust - fixed income              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Number of investments held in collective trusts | investment         9    
Partnership/joint venture interests              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Number of investments held in collective trusts | investment         2    
Hedge funds redemption period         30 days    
Redemption fee (as a percent)         0.55%    
Fair value | Level 2              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Fair value of long-term debt 3,160,000     3,160,000 $ 2,960,000 $ 3,160,000  
Hurricane Harvey              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Non-cash impairment charges for damage to television station       11,100      
Cash expenses related to repairing studio   $ 26,900   15,800      
Insurance recovery $ 21,000 5,000   26,000 26,000    
Net expense impact from hurricane   $ 900   $ 900 $ 1,100