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v2.4.0.8

Intangible Assets, Net - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2013
Referral relationships [Member] | Minimum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Estimated useful life | 6 years
Referral relationships [Member] | Maximum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Estimated useful life | 16 years
Non compete agreements [Member] | Minimum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Estimated useful life | 5 years
Non compete agreements [Member] | Maximum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Estimated useful life | 6 years

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration