Annual report pursuant to Section 13 and 15(d)

Acquisitions and Recent Transactions - 2017 Divestitures - Additional Information (Detail)

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Acquisitions and Recent Transactions - 2017 Divestitures - Additional Information (Detail) - USD ($)
1 Months Ended
Dec. 28, 2017
Jun. 01, 2017
May 30, 2017
Jan. 03, 2017
May 24, 2018
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Proceeds from sale of property, plant, and equipment         $ 800,000
Gain (loss) on disposition of assets         $ (200,000)
Proceeds from collection of lease receivables   $ 600,000      
Proceeds from sale of intangible assets     $ 10,000    
Gain (loss) on disposition of intangible assets     $ 56,000    
Word Broadcasting Network [Member]          
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Proceeds from sale of other assets       $ 500,000  
WQVN-AM Tower Site [Member]          
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Proceeds from sale of property, plant, and equipment $ 1,900,000        
Gain (loss) on disposition of assets $ 400,000