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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 86,189,361	$ 80,506,194
Less accumulated depreciation and amortization	(26,870,428)	(20,716,575)
Property and equipment, net	59,318,933	59,789,619
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	18,904,830	18,789,852
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	20,299,377	19,602,568
Broadcast Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	35,748,619	33,450,365
Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,043,463	1,883,038
Estimated useful lives (years)	5 years
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,696,843	5,201,349
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,496,229	$ 1,579,022
Minimum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	15 years
Minimum [Member] | Broadcast Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	5 years
Minimum [Member] | Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	5 years
Maximum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	30 years
Maximum [Member] | Broadcast Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	15 years
Maximum [Member] | Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	10 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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