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Intangible Assets, Net - Intangible Assets, Net (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Referral relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated amortization | $ 1,582 | $ 1,217
Non competition agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated amortization | $ 1,950 | $ 1,848

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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