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Organization, Nature of Operations and Basis of Presentation - Schedule of Multi Clinic Acquisition (Detail)	12 Months Ended
	Dec. 31, 2013 Clinic	Dec. 13, 2013	Dec. 09, 2013	May 22, 2012	Jul. 31, 2011	Jun. 30, 2011
Business Acquisition [Line Items]
Percentage of interest acquired		90.00%	60.00%	70.00%	51.00%	100.00%
Number of Clinics	5
February 2013 Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date	Feb. 28, 2013
Percentage of interest acquired	72.00%
Number of Clinics	9
April 2013 Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date	Apr. 30, 2013
Percentage of interest acquired	50.00%
Number of Clinics	5
May 2013 Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date	May 24, 2013
Percentage of interest acquired	80.00%
Number of Clinics	5
December 9, 2013 Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date	Dec. 09, 2013
Percentage of interest acquired	60.00%
Number of Clinics	12
December 13, 2013 Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date	Dec. 13, 2013
Percentage of interest acquired	90.00%
Number of Clinics	11
May 2012 Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date	May 22, 2012
Percentage of interest acquired	70.00%
Number of Clinics	7
July 2011 Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date	Jul. 25, 2011
Percentage of interest acquired	51.00%
Number of Clinics	20

X

- Definition

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

+ References

No definition available.

+ Details

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- 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.

+ References

No definition available.

+ Details

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