Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Reconciliation of Revenue from Segments to Consolidated (Detail)

v3.21.2
Revenue Recognition - Reconciliation of Revenue from Segments to Consolidated (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue, Net $ 65,983 $ 60,641 $ 189,118 $ 171,762
Block Programming—National [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     35,824 35,536
Block Programming—Local [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     18,072 18,211
Spot Advertising—National [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     10,565 10,179
Spot Advertising—Local [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     30,123 28,630
Infomercials [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     682 750
Network [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     14,729 13,505
Digital Advertising [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     32,406 25,365
Digital Streaming [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     6,138 4,592
Digital Downloads and eBooks [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     6,440 8,300
Subscriptions [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     10,317 8,066
Book Sales and e-commerce, net of estimated sales returns and allowances [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     11,303 8,085
Self-Publishing fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     4,730 3,860
Advertising—Print [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     125 279
Other Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     7,664 6,404
Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     187,236 169,842
Rental Income [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     1,882 1,920
Broadcast [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     140,422 130,041
Broadcast [Member] | Block Programming—National [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     35,824 35,536
Broadcast [Member] | Block Programming—Local [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     18,072 18,211
Broadcast [Member] | Spot Advertising—National [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     10,565 10,179
Broadcast [Member] | Spot Advertising—Local [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     30,123 28,630
Broadcast [Member] | Infomercials [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     682 750
Broadcast [Member] | Network [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     14,729 13,505
Broadcast [Member] | Digital Advertising [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     18,415 10,676
Broadcast [Member] | Digital Streaming [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     3,559 1,981
Broadcast [Member] | Digital Downloads and eBooks [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     509 3,049
Broadcast [Member] | Subscriptions [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     828 868
Broadcast [Member] | Book Sales and e-commerce, net of estimated sales returns and allowances [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     289 1,128
Broadcast [Member] | Self-Publishing fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Broadcast [Member] | Advertising—Print [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     2 1
Broadcast [Member] | Other Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     6,825 5,527
Broadcast [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     138,540 128,157
Broadcast [Member] | Rental Income [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     1,882 1,884
Digital [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     30,603 28,355
Digital [Member] | Block Programming—National [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Digital [Member] | Block Programming—Local [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Digital [Member] | Spot Advertising—National [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Digital [Member] | Spot Advertising—Local [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Digital [Member] | Infomercials [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Digital [Member] | Network [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Digital [Member] | Digital Advertising [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     13,859 14,473
Digital [Member] | Digital Streaming [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     2,579 2,611
Digital [Member] | Digital Downloads and eBooks [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     4,637 4,291
Digital [Member] | Subscriptions [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     9,227 6,679
Digital [Member] | Book Sales and e-commerce, net of estimated sales returns and allowances [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     163 108
Digital [Member] | Self-Publishing fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Digital [Member] | Advertising—Print [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Digital [Member] | Other Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     138 193
Digital [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     30,603 28,319
Digital [Member] | Rental Income [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     36
Publishing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     18,093 13,366
Publishing [Member] | Block Programming—National [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Publishing [Member] | Block Programming—Local [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Publishing [Member] | Spot Advertising—National [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Publishing [Member] | Spot Advertising—Local [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Publishing [Member] | Infomercials [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Publishing [Member] | Network [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Publishing [Member] | Digital Advertising [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     132 216
Publishing [Member] | Digital Streaming [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net      
Publishing [Member] | Digital Downloads and eBooks [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     1,294 960
Publishing [Member] | Subscriptions [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     262 519
Publishing [Member] | Book Sales and e-commerce, net of estimated sales returns and allowances [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     10,851 6,849
Publishing [Member] | Self-Publishing fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     4,730 3,860
Publishing [Member] | Advertising—Print [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     123 278
Publishing [Member] | Other Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     701 684
Publishing [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net     18,093 $ 13,366
Publishing [Member] | Rental Income [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, Net