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% |