Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Summary of Categories of Property and Equipment (Detail)

v3.10.0.1
Property and Equipment - Summary of Categories of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross, Total $ 264,646 $ 264,200
Less accumulated depreciation (167,934) (164,720)
Property, Plant and Equipment, Net, Total 96,712 99,480
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross, Total 31,686 32,320
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross, Total 28,942 28,962
Office Furnishings and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross, Total 36,079 37,583
Office Furnishings and Equipment Under Capital Lease Obligations [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross, Total 207 244
Antennae, Towers and Transmitting Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross, Total 85,330 85,632
Antennae Towers and Transmitting Equipment Under Capital Lease Obligations [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross, Total   795
Studio, Production and Mobile Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross, Total 28,959 29,697
Computer Software and Website Development Costs [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross, Total 26,308 24,477
Record and Tape Libraries [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross, Total 21 27
Automobiles [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross, Total 1,572 1,385
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross, Total 19,383 19,003
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross, Total $ 6,159 $ 4,075