Intangible Assets and Goodwill - Components of Company's Intangible Assets (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Franchise agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 162,761,000	$ 162,835,000
Accumulated Amortization	(94,039,000)	(87,330,000)
Net Balance	$ 68,722,000	75,505,000
Franchise agreements | Weighted Average
Finite Lived Intangible Assets [Line Items]
Initial amortization period	12 years
Other intangible assets
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 12,201,000	11,275,000
Accumulated Amortization	(8,751,000)	(8,550,000)
Net Balance	$ 3,450,000	2,725,000
Other intangible assets | Weighted Average
Finite Lived Intangible Assets [Line Items]
Initial amortization period	6 years 10 months 24 days
Software
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 9,252,000	8,356,000
Accumulated Amortization	(7,238,000)	(7,126,000)
Net Balance	$ 2,014,000	1,230,000
Software | Weighted Average
Finite Lived Intangible Assets [Line Items]
Initial amortization period	4 years 4 months 24 days
Software Development
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 1,868,000	857,000
Trademarks
Finite Lived Intangible Assets [Line Items]
Initial Cost	2,949,000	2,919,000
Accumulated Amortization	(1,513,000)	(1,424,000)
Net Balance	$ 1,436,000	$ 1,495,000
Trademarks | Weighted Average
Finite Lived Intangible Assets [Line Items]
Initial amortization period	14 years 7 months 6 days