Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v2.4.0.6
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Dec. 31, 2012
Station
Jun. 30, 2012
Dec. 31, 2012
Station
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jan. 31, 2007
Schedule Of Significant Accounting Policies [Line Items]              
Radio stations to be owned and/or operated across United States 99   99        
Interest capitalized     $ 100,000 $ 100,000      
Impairment charge 1,200,000 5,600,000          
Internally developed software and website development capitalized costs     2,300,000 2,300,000 2,700,000    
Amortization expense for internally developed software and website development capitalized costs     2,100,000 1,800,000 1,400,000    
Internally developed software and website development capitalized costs, useful life     3 years        
(Gain) loss on disposal of assets     (49,000) 4,153,000 (255,000)    
Pre-tax (Gain) loss on disposal of assets     (158,000) (1,225,000) (72,000)    
Gain from insurance proceeds for repairs     600,000        
Deferred rent revenue 4,600,000   4,600,000 4,700,000      
Sublease term     60 years        
Write off bond issue costs     300,000 100,000 700,000    
Payments to redeem notes     21,500,000 35,000,000 30,000,000    
Deferred financing costs amortization period           3 years  
Self insurance liability 600,000   600,000 600,000      
Liabilities for unrecognized tax benefits 1,300,000   1,300,000 3,800,000     3,000,000
Unrecognized tax benefit, interest accrued net of federal income tax benefits 20,000   20,000       100,000
Increase in unrecognized tax benefits     (2,500,000) 200,000      
Unrecognized tax benefits, penalty 20,000   20,000        
Additional reduction of reserve     400,000        
Valuation allowance to offset deferred tax asset 2,913,000   2,913,000 2,798,000      
Options to purchase Class A common stock 1,927,099   1,927,099 1,640,392 1,151,998 1,341,875  
Unvested restricted stock outstanding         10,000 5,000  
Number Of Anti Dilutive Shares     480,825 1,397,538 860,449    
Reduction of Retained Earnings
              
Schedule Of Significant Accounting Policies [Line Items]              
Liabilities for unrecognized tax benefits             2,100,000
Contingencies
              
Schedule Of Significant Accounting Policies [Line Items]              
Liabilities for unrecognized tax benefits             900,000
Los Angeles Market
              
Schedule Of Significant Accounting Policies [Line Items]              
Percentage of Total Revenue generated from advertising     16.20% 15.20% 15.80%    
Dallas
              
Schedule Of Significant Accounting Policies [Line Items]              
Percentage of Total Revenue generated from advertising     23.60% 23.20% 18.80%    
KKMO-AM in Seattle, Washington
              
Schedule Of Significant Accounting Policies [Line Items]              
Pre-tax (Gain) loss on disposal of assets       2,400,000      
KXMX-AM in Los Angeles, California
              
Schedule Of Significant Accounting Policies [Line Items]              
Pre-tax (Gain) loss on disposal of assets       2,100,000      
WAMD-AM, Aberdeen, Maryland
              
Schedule Of Significant Accounting Policies [Line Items]              
(Gain) loss on disposal of assets         (300,000)    
Pre-tax (Gain) loss on disposal of assets         (200,000)    
Related Party Real Estate
              
Schedule Of Significant Accounting Policies [Line Items]              
Pre-tax (Gain) loss on disposal of assets         (200,000)    
Other Fixed Assets and Equipment Disposals
              
Schedule Of Significant Accounting Policies [Line Items]              
Pre-tax (Gain) loss on disposal of assets         (200,000)    
Seizure of property by Dallas County School District
              
Schedule Of Significant Accounting Policies [Line Items]              
Pre-tax (Gain) loss on disposal of assets         300,000    
KPXI-FM, Tyler-Longview, Texas
              
Schedule Of Significant Accounting Policies [Line Items]              
Pre-tax (Gain) loss on disposal of assets     200,000        
Minimum
              
Schedule Of Significant Accounting Policies [Line Items]              
Lease term     1 year        
Maximum
              
Schedule Of Significant Accounting Policies [Line Items]              
Lease term     25 years        
Production Costs
              
Schedule Of Significant Accounting Policies [Line Items]              
Cost of media advertising and associated production costs     10,500,000 10,300,000 8,600,000    
Broadcast
              
Schedule Of Significant Accounting Policies [Line Items]              
Advertising revenue     $ 5,300,000 $ 5,200,000 $ 4,600,000    
Reportable operating segments     1        
Percentage of Total Revenue generated from advertising     42.30% 43.00% 43.30%    
All Other Segments
              
Schedule Of Significant Accounting Policies [Line Items]              
Reportable operating segments     2