Basis of Presentation and Significant Accounting Policies - Additional information (Detail) (USD $)	1 Months Ended		3 Months Ended		9 Months Ended
	Mar. 05, 2013	May 31, 2012 Clinic	Sep. 30, 2013 Clinic State	Sep. 30, 2012	Sep. 30, 2013 Clinic State	Sep. 30, 2012
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			447		447
Number of states where clinics are operated			43		43
Percentage of reduction prevented					26.50%
Percentage reduction in MPFS	24.40%
Percentage of Outpatient physical therapy services	1.00%
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%
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%
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
Prior Period Reclassification Adjustment Description					Prior period amounts have been reclassified to conform to current period presentation due to discontinued operations.
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.
Minimum [Member]
Depreciation Amortization Impairment [Line Items]
Combined physical therapy/speech language pathology expenses					3,700
Reduction in overall reimbursement for services Company provides to Medicare beneficiaries.					8.00%
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
Reduction in overall reimbursement for services Company provides to Medicare beneficiaries.					10.00%
Furniture & equipment [Member] | Minimum [Member]
Depreciation Amortization Impairment [Line Items]
Estimated useful lives					3 years
Furniture & equipment [Member] | Maximum [Member]
Depreciation Amortization Impairment [Line Items]
Estimated useful lives					8 years
Computer Software, Intangible Asset [Member] | Minimum [Member]
Depreciation Amortization Impairment [Line Items]
Estimated useful lives					3 years
Computer Software, Intangible Asset [Member] | Maximum [Member]
Depreciation Amortization Impairment [Line Items]
Estimated useful lives					7 years
Leasehold improvements [Member] | Minimum [Member]
Depreciation Amortization Impairment [Line Items]
Estimated useful lives					3 years
Leasehold improvements [Member] | Maximum [Member]
Depreciation Amortization Impairment [Line Items]
Estimated useful lives					5 years