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Significant Accounting Policies - Additional information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Depreciation Amortization Impairment [Line Items] |  |  |
Exercisable non controlling interest with put rights |  | $ 0 |
Percentage of reduction prevented in Medicare Fee rate | 20.10% |  |
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% |  |
Effective date of change in annual limit on outpatient therapy services | Jan. 01, 2014 |  |
Percentage of practice expense component | 100.00% |  |
Percentage reduction for service | 20.00% |  |
Percentage reduction for service in institutional settings | 25.00% |  |
Percentage of increased payment reduction | 50.00% |  |
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% |  |
Unrecognized tax benefit | 0 | 0 |
Accrued interest and penalties associated with any unrecognized tax benefits | 0 | 0 | 0
Interest expense recognized | 0 | 0 |
Stock option compensation | 0 | 0 | 0
Number of Shares, Granted | 648,346 |  | 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 |  |
Year 2016 [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Expected reduction in Medicare spending percentage | 2.00% |  |
Minimum [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Combined physical therapy/speech language pathology expenses | 3,700 |  |
Minimum [Member] | Furniture & equipment [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Minimum [Member] | Computer Software, Intangible Asset [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Minimum [Member] | Leasehold improvements [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Maximum [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Annual limit on physical therapy and speech language pathology services | 1,900 |  |
Annual limit occupational therapy services | 1,900 |  |
Maximum [Member] | Effective Date One [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Annual limit on physical therapy and speech language pathology services | 1,920 |  |
Annual limit occupational therapy services | $ 1,920 |  |
Maximum [Member] | Furniture & equipment [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Estimated useful lives | 8 years |  |
Maximum [Member] | Computer Software, Intangible Asset [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Estimated useful lives | 7 years |  |
Maximum [Member] | Leasehold improvements [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Estimated useful lives | 5 years |  |

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