Salem Media Group, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Goodwill - Fair Value Measurement Inputs and Valuation Techniques For Goodwill (Detail)

Goodwill - Fair Value Measurement Inputs and Valuation Techniques For Goodwill (Detail)	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Measurement Input Risk Adjusted Discount Rate [Member] \| Digital [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	950		1,000
Measurement Input Risk Adjusted Discount Rate [Member] \| Publishing [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	950	1,050	1,000
Measurement Input Risk Adjusted Discount Rate [Member] \| Radio Clusters [Member] \| Broadcast Networks Enterprise Valuations [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	850		900
Measurement Input, Long-term Revenue Growth Rate [Member] \| Digital [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	100
Measurement Input, Long-term Revenue Growth Rate [Member] \| Publishing [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage		50	50
Minimum [Member] \| Measurement Input Operating Profit Margin [Member] \| Digital [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	340		370
Minimum [Member] \| Measurement Input Operating Profit Margin [Member] \| Publishing [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	150	0	150
Minimum [Member] \| Measurement Input Operating Profit Margin [Member] \| Radio Clusters [Member] \| Broadcast Networks Enterprise Valuations [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	1,140		3,110
Minimum [Member] \| Measurement Input, Long-term Revenue Growth Rate [Member] \| Digital [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage			50
Minimum [Member] \| Measurement Input, Long-term Revenue Growth Rate [Member] \| Publishing [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	100
Minimum [Member] \| Measurement Input, Long-term Revenue Growth Rate [Member] \| Radio Clusters [Member] \| Broadcast Networks Enterprise Valuations [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	50		70
Maximum [Member] \| Measurement Input Operating Profit Margin [Member] \| Digital [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	680		2,880
Maximum [Member] \| Measurement Input Operating Profit Margin [Member] \| Publishing [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	440	390	390
Maximum [Member] \| Measurement Input Operating Profit Margin [Member] \| Radio Clusters [Member] \| Broadcast Networks Enterprise Valuations [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	4,150		3,870
Maximum [Member] \| Measurement Input, Long-term Revenue Growth Rate [Member] \| Digital [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage			100
Maximum [Member] \| Measurement Input, Long-term Revenue Growth Rate [Member] \| Publishing [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	50
Maximum [Member] \| Measurement Input, Long-term Revenue Growth Rate [Member] \| Radio Clusters [Member] \| Broadcast Networks Enterprise Valuations [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Intangible asset measurement input percentage	80		90