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Basis of Presentation and Significant Accounting Policies - Additional information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended
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May 31, 2012 Clinic | Jun. 30, 2013 State Clinic | Jun. 30, 2012 | Jun. 30, 2013 Facility Clinic State | Jun. 30, 2012 | Jun. 30, 2013 Minimum [Member] | Jun. 30, 2013 Maximum [Member] | Dec. 31, 2012 Maximum [Member] | Jun. 30, 2013 Furniture & equipment [Member] Minimum [Member] | Jun. 30, 2013 Furniture & equipment [Member] Maximum [Member] | Jun. 30, 2013 Computer Software, Intangible Asset [Member] Minimum [Member] | Jun. 30, 2013 Computer Software, Intangible Asset [Member] Maximum [Member] | Jun. 30, 2013 Leasehold improvements [Member] Minimum [Member] | Jun. 30, 2013 Leasehold improvements [Member] Maximum [Member]
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of general partnership interest owned |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Percentage of limited partnership interest owned |  |  |  | 64.00% |  |  |  |  |  |  |  |  |  |
Number of clinic acquired | 7 |  |  | 1 |  |  |  |  |  |  |  |  |  |
Number of clinics operated |  | 449 |  | 449 |  |  |  |  |  |  |  |  |  |
Number of states where clinics are operated |  | 43 |  | 43 |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 3 years | 8 years | 3 years | 7 years | 3 years | 5 years
Percentage of reduction prevented |  |  |  | 26.50% |  |  |  |  |  |  |  |  |  |
Effective date of reduction in Medicare physician fee payment rate |  |  |  | Apr. 01, 2013 |  |  |  |  |  |  |  |  |  |
Federal debt ceiling in connection with deficit reductions |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Reductions in federal spending |  |  |  | $ 1,200,000,000,000 |  |  |  |  |  |  |  |  |  |
Medicare spending cut percentage |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |
Expected reduction in Medicare spending percentage |  | 2.00% |  | 2.00% |  |  |  |  |  |  |  |  |  |
Annual limit on physical therapy and speech language pathology services |  |  |  |  |  |  | 1,900 | 1,880 |  |  |  |  |  |
Annual limit occupational therapy services |  |  |  |  |  |  | 1,900 | 1,880 |  |  |  |  |  |
Combined physical therapy/speech language pathology expenses |  |  |  |  |  | 3,700 |  |  |  |  |  |  |  |
Occupational therapy cap expenses |  |  |  |  |  | 3,700 |  |  |  |  |  |  |  |
Percentage of practice expense component |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Percentage reduction for service |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |
Percentage reduction for service in institutional settings |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Reduction in overall reimbursement for services Company provides to Medicare beneficiaries. |  |  |  |  |  | 8.00% | 10.00% |  |  |  |  |  |  |
Percentage of increased payment reduction |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Number of physician services facilities |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Difference between net revenues and corresponding cash collections, approximately of net revenues |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Maximum difference between actual aggregate contractual reserve and estimated contractual allowance reserve |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Minimum difference between actual aggregate contractual reserve and estimated contractual allowance reserve |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Minimum percentage of fair value reporting unit less than carrying amount |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Accrued interest and penalties associated with any unrecognized tax benefits |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |
Unrecognized tax benefit |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |
Interest expense recognized |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |
Shares granted to employees lapse in equal installments on the following four or five annual anniversaries of the date of grant |  |  |  | Shares granted to employees lapse in equal installments on the following four or five annual anniversaries of the date of grant. |  |  |  |  |  |  |  |  |  |

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