Intangible Assets and Goodwill - Components of company's Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Initial Cost	$ 10,398	$ 9,874
Accumulated Amortization	(7,912)	(7,053)
Net Balance	2,486	2,821
Net Balance	91,557
Software
Business Acquisition [Line Items]
Initial Weighted Average Amortization Period (in years)	4 years 2 months 12 days
Initial Cost	7,463	7,158
Accumulated Amortization	(6,633)	(5,942)
Net Balance	830	1,216
Trademarks
Business Acquisition [Line Items]
Initial Weighted Average Amortization Period (in years)	14 years 10 months 24 days
Initial Cost	2,935	2,716
Accumulated Amortization	(1,279)	(1,111)
Net Balance	1,656	1,605
Franchise Agreements
Business Acquisition [Line Items]
Initial Weighted Average Amortization Period (in years)	12 years 1 month 6 days
Initial Cost	162,835	139,827
Accumulated Amortization	(73,764)	(61,489)
Net Balance	$ 89,071	$ 78,338