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Goodwill - Schedule of Key Assumptions in Discounted Cash Flow Analysis (Detail)
12 Months Ended
Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Long-term revenue growth rate 2.50%
Discount rate 9.50%
Minimum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Station operating income margins 23.50%
Maximum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Station operating income margins 50.00%