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Description of business, basis of presentation and summary of significant accounting policies - Narrative (Detail) | 12 Months Ended |  |
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Dec. 31, 2019 USD ($) segment investment market station | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) investment | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of television stations | station |  | 62 |  |  |  |
Number of radio stations | station |  | 4 |  |  |  |
Number of markets In which entity operates | market |  | 51 |  |  |  |
Number of operating segments | segment |  | 1 |  |  |  |
Number of reportable segments | segment |  | 1 |  |  |  |
Write-offs of accounts receivable |  | $ 3,000,000.0 | $ 3,900,000 | $ 1,900,000 |  |
Goodwill |  | 2,950,587,000 | 2,596,863,000 | $ 2,579,417,000 |  |
Gain on sale of equity investments |  | $ 19,700,000 |  |  |  |
Number of investments | investment |  | 4 |  | 1 |  |
Impairment charge to cost method investments |  |  | 2,000,000.0 | $ 2,600,000 |  |
Investments in non-public businesses, non-operating expense |  | $ 32,400,000 | 24,500,000 |  |  |
Gain on other equity investment |  | 5,900,000 |  |  |  |
Impairment of indefinite-lived intangible assets |  | $ 0 | 0 | 0 |  |
Cumulative effects of accounting changes |  |  |  |  |  | $ 3,724,000
Submission period for customers to submit payments |  | Our customers submit payments monthly, generally within 60-90 days after the month that the service was provided. |  |  |  |
Cost of revenues | [1] | $ 1,228,237,000 | 1,065,933,000 | 933,718,000 |  |
Right-of-use assets for operating leases |  | 103,461,000 |  |  | $ 73,800,000 |
Operating lease, liability |  | 116,992,000 |  |  | 91,800,000 |
Capitalized costs |  | $ 1,400,000 |  |  |  |
Restricted Stock |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Requisite service period |  | 4 years |  |  |  |
Performance Shares |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Requisite service period |  | 3 years |  |  |  |
Cost of Sales |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Bad debt expense |  | $ 2,400,000 | 3,900,000 | 2,600,000 |  |
Minimum | Building and Improvements |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life (in years) |  | 10 years |  |  |  |
Minimum | Machinery, Equipment, and Fixtures |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life (in years) |  | 3 years |  |  |  |
Maximum | Building and Improvements |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life (in years) |  | 40 years |  |  |  |
Maximum | Machinery, Equipment, and Fixtures |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life (in years) |  | 25 years |  |  |  |
Advertising | Selling, General and Administrative Expenses |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cost of revenues |  | $ 9,400,000 | $ 10,400,000 | $ 5,000,000.0 |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Right-of-use assets for operating leases |  |  |  |  | $ 7,500,000 |
Debt Investments |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of investments | investment |  |  |  | 1 |  |
Impairment charge to cost method investments |  |  |  | $ 5,800,000 |  |
[1] | Cost of revenues exclude charges for depreciation and amortization expense, which are shown separately above.

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