Annual report pursuant to Section 13 and 15(d)

Goodwill - Additional Information (Detail)

v3.20.4
Goodwill - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Impairment of goodwill $ 307 $ 2,427
Broad Cast Markets Due to Cost/Benefit [Member]    
Impairment of goodwill 300  
Digital Media [Member]    
Impairment of goodwill 0  
Publishing [Member]    
Impairment of goodwill $ 100  
Goodwill [Member]    
Percentage Increase Decrease In Fair Value Of Goodwill 32.10%