Fair Value Measurements (Additional Information for Financial Assets and Liabilities and Non-Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Fair Value Disclosures [Abstract] | |||
| Impairment charges - equity interest in Pulser Media Inc. | $ 19,364 | $ 0 | $ 0 |