Annual report pursuant to Section 13 and 15(d)

Stock Incentive Plan - Schedule of Stock-Based Compensation Expense Recognized (Detail)

v3.20.4
Stock Incentive Plan - Schedule of Stock-Based Compensation Expense Recognized (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock-based compensation expense, pre-tax $ 345 $ 1,460
Tax expense from stock-based compensation expense (90) (380)
Total stock-based compensation expense, net of tax 255 1,080
Unallocated Corporate [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock option compensation expense 152 271
Restricted stock shares compensation expenses   623
Broadcast [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock option compensation expense 136 111
Restricted stock shares compensation expenses   383
Digital Media [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock option compensation expense 56 71
Publishing [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock option compensation expense $ 1 $ 1