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Broadcast License, Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2020
Broadcast License, Goodwill and Other Intangible Assets |
Schedule of certain key estimates and assumptions used in impairment test | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Second and Third Quarter 2020 | ​ | Fourth Quarter 2019 | ​ | Fourth Quarter 2018
Discount Rates | ​ | 12.6% - 13.0% | ​ | 12.2% - 12.2% | ​ | 12.0% - 12.0%
Operating profit margin ranges | ​ | 17.8% - 36.4% | ​ | 19.0% - 36.4% | ​ | 19.0% - 36.4%
Market long-term revenue growth rates | ​ | 0.2% - 2.9% | ​ | 0.0% - 2.9% | ​ | 0.5% - 2.9%

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- Definition The schedule related to certain key estimates and assumptions used in the impairment test. + References No definition available. + Details
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Namespace Prefix: | sga_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration