The amount of additional consideration for extension of the license period.

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Useful life of additional renewal of television broadcast concession license, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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This item represents the net carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Percentage of losses recognized under equity method investments.

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Useful life of Renewable television broadcast concession license, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

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In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Amount of noncurrent assets classified as other.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Equity Method Investments (Details) - USD ($)			1 Months Ended		3 Months Ended			9 Months Ended		12 Months Ended
Equity Method Investments (Details) - USD ($)	Apr. 28, 2017	Nov. 30, 2016	Mar. 31, 2020	Jul. 31, 2019	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jul. 15, 2021	Nov. 26, 2018	Feb. 07, 2018	Feb. 06, 2018
Equity method investments
Amount funded during the period								$ 4,453,000	$ 7,499,000
Equity method investments					$ 24,959,000			24,959,000		$ 29,782,000
Income (loss) on equity method investments					3,222,000		$ 988,000	(20,818,000)	18,196,000
Non-cash impairment charge									5,479,000
Other assets					7,429,000			7,429,000		4,333,000
Canal 1
Equity method investments
Equity method investments					124,000,000.0			124,000,000.0
Income (loss) on equity method investments					3,200,000		1,000,000.0	$ 9,300,000	18,000,000.0
Percentage of losses recorded								100.00%
Net equity method investments					25,000,000.0			$ 25,000,000.0		29,900,000
Other assets					2,600,000			$ 2,600,000		2,600,000
Colombian content producers, Radio television and NTC Nacional \| Television broadcast license
Equity method investments
Ownership Percentage													40.00%	20.00%
License life (in years)		10 years						20 years
Additional consideration for the extended license period				$ 0
Additional renewable period for license (in years)				10 years
REMEZCLA
Equity method investments
Net equity method investments					0			$ 0		0
Non-cash impairment charge			$ 5,500,000
Total consideration	$ 5,000,000.0
Snap Global. LLC
Equity method investments
Ownership Percentage											100.00%
Snap JV
Equity method investments
Equity method investments					400,000			400,000
Income (loss) on equity method investments					$ 0		$ 0	100,000	$ (200,000)	$ 100,000
PANTAYA
Equity method investments
Equity method investments						$ 0
Equity interest owned prior to transaction (in percent)						25.00%
Non-cash gain on step acquisition of unconsolidated affiliate						$ 30,100,000		$ 30,100,000
Equity interest acquired (as a percent)						75.00%
Total consideration						$ 127,292,000
REMEZCLA
Equity method investments
Equity interest acquired (as a percent)	25.50%
Snap JV \| Snap Global. LLC
Equity method investments
Equity interest acquired (as a percent)												50.00%