Intangible Assets and Goodwill - Components of Company's Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Finite Lived Intangible Assets [Line Items]
Initial Weighted Average Amortization Period (in years)	6 years 10 months 24 days
Initial Cost	$ 11,564	$ 11,275
Accumulated Amortization	(8,705)	(8,550)
Net Balance	72,114	75,505
Net Balance	2,859	2,725
Franchise Agreements
Finite Lived Intangible Assets [Line Items]
Initial Weighted Average Amortization Period (in years)	12 years
Initial Cost	162,835	162,835
Accumulated Amortization	(90,721)	(87,330)
Net Balance	72,114	75,505
Software
Finite Lived Intangible Assets [Line Items]
Initial Weighted Average Amortization Period (in years)	4 years 3 months 18 days
Initial Cost	8,633	8,356
Accumulated Amortization	(7,236)	(7,126)
Net Balance	1,397	1,230
Trademarks
Finite Lived Intangible Assets [Line Items]
Initial Weighted Average Amortization Period (in years)	14 years 7 months 6 days
Initial Cost	2,931	2,919
Accumulated Amortization	(1,469)	(1,424)
Net Balance	$ 1,462	$ 1,495