Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Expense Recognized (Detail)

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Stock-Based Compensation Expense Recognized (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total Stock-based compensation expense, pre-tax $ 1,368 $ 950 $ 1,437
Tax provision for stock-based compensation expense (579) (220) (792)
Total stock-based compensation expense, net of tax 789 730 645
Corporate
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock option expense 933 603 947
Restricted stock expense   4 17
Broadcast
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock option expense 305 281 380
Internet
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock option expense 111 52 79
Publishing segment
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock option expense $ 19 $ 10 $ 14