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Fair value measurement - Narrative (Detail) $ in Thousands		3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 18, 2019 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) investment	Dec. 31, 2019 USD ($) investment	Dec. 31, 2018 USD ($)	Sep. 30, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gain on other equity investment					$ 5,900
Impairment charge to cost method investments				$ 2,600		$ 2,000
Number of investments held in collective trusts | investment				1	4
Non-cash goodwill impairment charge			$ 332,900
Hedge funds redemption period					95 days
Future funding commitments					$ 700
Hedge funds redemption potential holdback percentage					5.00%
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gain on other equity investment					$ 5,900
Common collective trust - fixed income
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of investments held in collective trusts | investment					9
Equity Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of investments held in collective trusts | investment					4
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)					0.45%
Hedge funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of investments held in collective trusts | investment					1
Fair value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt					$ 4,320,000	2,960,000
Justice & Quest
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Ownership interest (as a percent)							15.00%
Step acquisition, gain recognized	$ 7,300
Step acquisition, equity interest, fair value	$ 12,995				$ 8,000
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		26,000		26,000
Net expense impact from hurricane		$ 900		900		$ 1,100
Debt Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment charge to cost method investments				$ 5,800
Number of investments held in collective trusts | investment				1

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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