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Acquisition of Businesses - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |  | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 Transactions | Sep. 16, 2013 | Jun. 01, 2013 | Feb. 01, 2013 | Dec. 31, 2013 February 2014 | Dec. 31, 2013 February 2015 | Dec. 31, 2013 April 2014 | Dec. 31, 2013 April 2015 | Dec. 31, 2013 May 2014 | Dec. 31, 2013 May 2015 | Dec. 31, 2013 December 2014 | Dec. 31, 2013 December 2015 | Mar. 31, 2014 Acquisition Of Two Clinic Practices Clinic | Dec. 31, 2013 Acquisition Of Clinics On Separate Transactions Clinic | Dec. 31, 2013 February 2013 Acquisition Installment | Dec. 31, 2013 April 2013 Acquisition Installment | Dec. 31, 2013 May 2013 Acquisition Installment | Dec. 31, 2013 December 9, 2013 Acquisition | Dec. 31, 2013 December 13, 2013 Acquisition Installment
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of clinic practices acquired |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 3 |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000 |  | $ 4,300,000 | $ 2,400,000 | $ 3,600,000 | $ 1,700,000 | $ 35,500,000
Number of multi-clinic acquisitions | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 100.00% | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  | 72.00% | 50.00% | 80.00% | 60.00% | 90.00%
Seller notes issued for acquisition of interest in clinic | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 | 200,000 | 200,000 |  | 500,000
Business acquisition number of installments to payment of purchase consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 | 2 |  | 2
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  | 200,000 | 200,000 | 100,000 | 100,000 | 100,000 | 100,000 | 250,000 | 250,000 |  |  |  |  |  |  |
Business acquisition, cost of acquired entity |  | $ 130,000 | $ 95,000 | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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