Intangible Assets and Goodwill - Changes in Carrying Amount of Franchise Assets and Goodwill (Parenthetical) (Detail) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|---|
| Goodwill And Intangible Assets Disclosure [Abstract] | |||
| Net of accumulated impairment losses | $ 797,625 | $ 796,725 | $ 796,725 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|