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

Contingent Earn-Out Consideration - Additional Information (Detail)

Contingent Earn-Out Consideration - Additional Information (Detail) - USD ($)								1 Months Ended	6 Months Ended	9 Months Ended		12 Months Ended		24 Months Ended
	Dec. 31, 2018	Aug. 09, 2018	Aug. 07, 2018	Jun. 08, 2017	May 06, 2017	May 06, 2015	Feb. 06, 2015	Jul. 06, 2017	Jun. 30, 2018	Sep. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Feb. 06, 2017	Mar. 01, 2017	Sep. 13, 2016
Business Acquisition, Contingent Consideration [Line Items]
Business combination, liabilities arising from contingencies, amount recognized															$ 500,000
Business combination, contingent consideration arrangements, change in amount of contingent consideration, liability												$ 76,000	$ (23,000)
Business combination, contingent consideration arrangements payment												(140,000)	(14,000)
Portuguese Bible Mobile Application [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business acquisition cost of acquired entity cash paid net				$ 65,000
Business combination, contingent consideration maximum payment				20,000
Business combination liabilities arising from contingencies amount recognized discounted present value				$ 16,500
Business combination, contingent consideration arrangements, change in amount of contingent consideration, liability									$ (3,200)				1,700
Business combination, contingent consideration arrangements payment									15,000
TradersCrux com [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business acquisition cost of acquired entity cash paid net								$ 300,000
Business combination, contingent consideration maximum payment								100,000
Business combination, liabilities arising from contingencies, amount recognized								18,750
Business acquisition contingent earn out consideration payable								100,000
Business combination, contingent consideration arrangements, change in amount of contingent consideration, liability									$ 75,000				31,000
Payments to acquire businesses, gross								$ 300,000
Business combination, contingent consideration arrangements payment										$ 125,000
Turner Investment Products [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business acquisition cost of acquired entity cash paid net																$ 400,000
Business combination, contingent consideration maximum payment																100,000
Business combination, liabilities arising from contingencies, amount recognized																$ 66,000
Business combination, contingent consideration arrangements, change in amount of contingent consideration, liability													(53,000)
Daily Bible Devotion (business acquisition) [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business acquisition cost of acquired entity cash paid net						$ 1,100,000
Business combination, contingent consideration maximum payment						300,000
Business combination, liabilities arising from contingencies, amount recognized						165,000
Business combination liabilities arising from contingencies amount recognized discounted present value						$ 142,000
Business combination, contingent consideration arrangements, change in amount of contingent consideration, liability					$ (4,000)
Business combination, contingent consideration arrangements payment													75,000
Bryan Perry Newsletters (business acquisition) [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business combination liabilities arising from contingencies amount recognized discounted present value							$ 158,000
Business combination, contingent consideration arrangements, change in amount of contingent consideration, liability											$ 1,000
Business combination, contingent consideration arrangements payment													$ 14,000	$ 91,000
Contingent earn out consideration due to seller net subscriber revenues percentage							50.00%
Business combination, contingent consideration, liability							$ 171,000
Hilary Kramer Financial Newsletters [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business acquisition cost of acquired entity cash paid net		$ 400,000
Business combination, contingent consideration maximum payment		100,000
Business combination, liabilities arising from contingencies, amount recognized	$ 0	40,617										$ 0
Business combination liabilities arising from contingencies amount recognized discounted present value		39,360
Business acquisition contingent earn out consideration payable		$ 100,000
Just1Word Mobile Application [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business acquisition cost of acquired entity cash paid net			$ 300,000
Business combination, contingent consideration maximum payment			100,000
Business combination, liabilities arising from contingencies, amount recognized			12,750
Business combination liabilities arising from contingencies amount recognized discounted present value			12,212
Business acquisition contingent earn out consideration payable			$ 100,000
Business combination, contingent consideration arrangements, change in amount of contingent consideration, liability	$ 4,000