Intangible Assets and Goodwill - Components of Company's Intangible Assets (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 14,079,000	$ 14,206,000	$ 12,985,000
Franchise agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	162,438,000	162,835,000
Accumulated Amortization	(100,499,000)	(87,330,000)
Net Balance	$ 61,939,000	75,505,000
Franchise agreements | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	12 years 9 months 18 days
Other intangible assets
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 13,870,000	11,275,000
Accumulated Amortization	(8,929,000)	(8,550,000)
Net Balance	$ 4,941,000	2,725,000
Other intangible assets | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	8 years 8 months 12 days
Software
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 10,885,000	8,356,000
Accumulated Amortization	(7,325,000)	(7,126,000)
Net Balance	$ 3,560,000	1,230,000
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	$ 2,985,000	2,919,000
Accumulated Amortization	(1,604,000)	(1,424,000)
Net Balance	$ 1,381,000	1,495,000
Trademarks | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	14 years 6 months
Software Development
Finite Lived Intangible Assets [Line Items]
Capitalized costs	$ 3,165,000	$ 857,000