Basis of Presentation and Significant Accounting Policies - Schedule of Clinic Acquisition (Detail)
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12 Months Ended | 9 Months Ended | ||||||
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Dec. 31, 2012
Clinic
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Sep. 30, 2013
|
Sep. 16, 2013
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Feb. 28, 2013
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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
|
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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 |