Intangible Assets, Net - Intangible Assets, Net (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Total	$ 14,479	$ 12,146
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Total	9,814	7,973
Referral relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Total	3,959	3,501
Non competition agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Total	$ 706	$ 672