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Basis of Presentation and Significant Accounting Policies - Schedule of Clinic Acquisition (Detail) | 12 Months Ended |  |  |  |  | 9 Months Ended
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Dec. 31, 2012 Clinic | Sep. 30, 2013 | Sep. 16, 2013 | Feb. 28, 2013 | May 22, 2012 | Sep. 30, 2013 February 2013 Acquisition [Member] Clinic | Sep. 30, 2013 April 2013 Acquisition [Member] Clinic | Sep. 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% | 100.00% | 70.00% | 72.00% | 50.00% | 80.00%
Number of clinics | 7 |  |  |  |  | 9 | 5 | 5

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- 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 + Details
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