Summary of Identifiable Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Intangible assets gross	$ 12,351	$ 10,707
Accumulated Amortization	(6,325)	(4,641)
Intangible assets net	6,026	6,066
Customer relationship intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible assets gross	4,377	3,400
Accumulated Amortization	(2,170)	(1,001)
Intangible assets net	2,207	2,399
Non-compete intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible assets gross	3,408	2,855
Accumulated Amortization	(1,471)	(1,062)
Intangible assets net	1,937	1,793
Acquired franchise development rights
Finite-Lived Intangible Assets [Line Items]
Intangible assets gross	4,566	4,452
Accumulated Amortization	(2,684)	(2,578)
Intangible assets net	$ 1,882	$ 1,874