Goodwill and Intangible Assets - Changes in Carrying Amount of Franchise Assets and Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Indefinite-lived Intangible Assets [Line Items]
Net Goodwill, Beginning balance	$ 476,315
Net Goodwill, Additions through current year acquisitions	7,034
Net Goodwill, Prior year acquisition allocations	(3)
Net Goodwill, Reclassifications to assets held for sale	(1,011)
Net Goodwill, Reductions from dispositions	(8,247)
Net Goodwill, Ending balance	474,088
Franchise Assets [Member]
Indefinite-lived Intangible Assets [Line Items]
Franchise Assets, Beginning balance	79,535
Franchise Assets, Additions through current year acquisitions	1,000
Franchise Assets, Reductions from dispositions	(5,435)
Franchise Assets, Ending balance	$ 75,100