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Basis of Presentation and Significant Accounting Policies - Schedule of Clinic Acquisition (Detail)	12 Months Ended				6 Months Ended
	Dec. 31, 2012 Clinic	Jun. 30, 2013	Feb. 28, 2013	May 22, 2012	Jun. 30, 2013 February 2013 Acquisition [Member] Clinic	Jun. 30, 2013 April 2013 Acquisition [Member] Clinic	Jun. 30, 2013 May 2013 Acquisition [Member] Clinic
Loans At Acquisition Date [Line Items]
Acquisition date					Feb. 28, 2013	Apr. 30, 2013	May 24, 2013
Percentage of interest acquired		100.00%	100.00%	70.00%	72.00%	50.00%	80.00%
Number of clinics	7				9	5	5

X

- Definition

Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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- Definition

The number of businesses acquired by the entity during the period.

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