Salem Media Group, Inc. Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Fair Value of Financial Assets and Liabilities (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Liabilities:
Estimated fair value of contingent earn-out consideration included in accrued expenses	$ 55
Long-term debt less unamortized debt issuance costs	243,683
Other Indefinite Lived Intangible Assets [Member]
Assets
Estimated fair value of other indefinite-lived intangible assets	277
Fair Value, Inputs, Level 2 [Member] \| Other Indefinite Lived Intangible Assets [Member]
Liabilities:
Long-term debt less unamortized debt issuance costs	224,551
Fair Value, Inputs, Level 3 [Member] \| Other Indefinite Lived Intangible Assets [Member]
Assets
Estimated fair value of other indefinite-lived intangible assets	277
Liabilities:
Estimated fair value of contingent earn-out consideration included in accrued expenses	$ 55