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Organization, Nature of Operations and Basis of Presentation - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2013 Clinic Facility State | Dec. 31, 2012 Clinic
Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |
Number of clinics operated | 472 |
Number of states where clinics are operated | 43 |
Number of third party facilities | 18 |
Percentage of general partnership interest owned | 1.00% |
Percentage of limited partnership interest owned | 64.00% |
Number of clinic practices acquired | 3 | 7
Number of clinic practices operated under separate partnership | 2 | 2
Number of clinic practices operated under existing partnership | 5 | 5
Number of Clinics | 5 |

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