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Dispositions - Additional Information (Detail) - USD ($)			3 Months Ended	6 Months Ended
	Mar. 28, 2019	Mar. 15, 2019	Mar. 31, 2019	Jun. 30, 2019	May 05, 2020
Business Acquisition [Line Items]
Gain on sale of assets				$ 3,545,755
Proceeds from sale of assets				$ 3,800,000
Augusta GA [Member]
Business Acquisition [Line Items]
Gain on sale of assets			$ 400,000
Proceeds from sale of assets	$ 500,000
Operating and Broadcast Rights [Member] | Clearwire [Member]
Business Acquisition [Line Items]
Gain on cancelation of license			$ 3,100,000
Proceeds from cancellation of license		$ 3,300,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Land [Member]
Business Acquisition [Line Items]
Non current assets disposal consideration receivable					$ 4,700,000

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Proceeds from license fee received on cancellation of license.

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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

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- Definition

Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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