Intangible Assets and Goodwill - Components of Company's Intangible Assets (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 3,514,000	$ 3,549,000
Franchise agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	167,538,000		$ 162,438,000
Accumulated Amortization	(103,940,000)		(100,499,000)
Net Balance	$ 63,598,000		61,939,000
Franchise agreements | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	12 years 8 months 12 days
Other intangible assets
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 13,997,000		13,870,000
Accumulated Amortization	(8,410,000)		(8,929,000)
Net Balance	$ 5,587,000		4,941,000
Other intangible assets | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	8 years 2 months 12 days
Software
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 10,984,000		10,885,000
Accumulated Amortization	(6,767,000)		(7,325,000)
Net Balance	$ 4,217,000		3,560,000
Software | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	4 years 8 months 12 days
Trademarks
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 3,013,000		2,985,000
Accumulated Amortization	(1,643,000)		(1,604,000)
Net Balance	$ 1,370,000		1,381,000
Trademarks | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	14 years 4 months 24 days
Software Development
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 3,856,000		$ 3,165,000