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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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- Definition Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Redemption Fee, Percentage + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258 + Details
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