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Intangible Assets, Net - Intangible Assets, Net (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |
Total | $ 15,916 | $ 14,479
Tradenames |  |
Finite Lived Intangible Assets [Line Items] |  |
Total | 10,714 | 9,814
Referral relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Total | 4,343 | 3,959
Non-competition agreements |  |
Finite Lived Intangible Assets [Line Items] |  |
Total | $ 859 | $ 706

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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