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Significant Accounting Policies (Details)			12 Months Ended
	Jan. 29, 2021 USD ($)	Dec. 27, 2020	Dec. 31, 2020 USD ($) Segment Region	Dec. 31, 2019 USD ($) Region	Dec. 31, 2018 USD ($) Region	Mar. 31, 2021	Feb. 09, 2018	Nov. 02, 2015	Apr. 01, 2013
Revenue Recognition [Abstract]
Revenue related to the various categories			$ 422,969,000	$ 481,969,000	$ 453,911,000
Goodwill [Abstract]
Number of business segments | Segment			2
Number of regions | Region			6	6	6
Write-off of goodwill - closed clinics			$ 1,859,000	$ 0	$ 0
Medicare Reimbursement [Abstract]
Estimated percentage of decrease in payment		9.00%	3.50%
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%	2.00%	2.00%
Combined physical therapy/speech language pathology expenses			$ 3,700
Reduction in combined physical therapy/speech language pathology expenses			$ 3,000
Percentage of practice expense component			100.00%
Percentage reduction for service			50.00%
Percentage of payment for outpatient therapy services			85.00%
Net patient revenue from Medicare accounts			$ 101,600,000
Income Taxes [Abstract]
Accrued interest and penalties associated with any unrecognized tax benefits			0	0	0
Interest expense recognized			0	0	0
Recently Adopted Accounting Guidance [Abstract]
Operating lease right-of-use assets			81,595,000	81,586,000
Lease Liability			$ 89,497,000
Credit Agreement [Member]
Subsequent Event [Abstract]
Revolving credit facility maturity date			Nov. 30, 2025
Credit Agreement [Member] | Subsequent Event [Member]
Subsequent Event [Abstract]
Revolving credit facility commitment	$ 125,000,000
Revolving credit facility maturity date	Nov. 30, 2021
Aggregate amount of notes payable	$ 150,000,000
Forecast [Member]
Medicare Reimbursement [Abstract]
Expected reduction in Medicare spending percentage						2.00%
ASU 2016-02 [Member]
Recently Adopted Accounting Guidance [Abstract]
Operating lease right-of-use assets			$ 78,000,000.0
Lease Liability			$ 82,600,000
Year 2018 [Member]
Medicare Reimbursement [Abstract]
Percentage of increase in Medicare payment rates			0.50%
Year 2019 [Member]
Medicare Reimbursement [Abstract]
Percentage of increase in Medicare payment rates			0.25%
From 2019 through 2024 [Member]
Medicare Reimbursement [Abstract]
Percentage of bonus payment by APM			5.00%
From 2020 through 2025 [Member]
Medicare Reimbursement [Abstract]
Percentage of increase in Medicare payment rates			0.00%
Employee [Member]
Restricted Stock [Abstract]
Period in which restrictions lapse on stock granted			4 years
Director [Member]
Restricted Stock [Abstract]
Period in which restrictions lapse on stock granted			1 year
Officer [Member]
Restricted Stock [Abstract]
Period in which restrictions lapse on stock granted			4 years
Minimum [Member]
Redeemable Non-Controlling Interests [Abstract]
Redeemable non-controlling interest, redemption rights, commencement period			3 years
Medicare Reimbursement [Abstract]
Difference between net revenues and corresponding cash collections, approximately of net revenues			1.00%
Difference between actual aggregate contractual reserve and estimated contractual allowance reserve percentage			1.00%
Maximum contractual allowance reserve estimate			1.00%
Minimum [Member] | Furniture & Equipment [Member]
Long-Lived Assets [Abstract]
Estimated useful lives			3 years
Minimum [Member] | Software [Member]
Long-Lived Assets [Abstract]
Estimated useful lives			3 years
Minimum [Member] | Leasehold Improvements [Member]
Long-Lived Assets [Abstract]
Estimated useful lives			3 years
Maximum [Member]
Redeemable Non-Controlling Interests [Abstract]
Redeemable non-controlling interest, redemption rights, commencement period			5 years
Medicare Reimbursement [Abstract]
Difference between net revenues and corresponding cash collections, approximately of net revenues			1.50%
Difference between actual aggregate contractual reserve and estimated contractual allowance reserve percentage			1.50%
Maximum contractual allowance reserve estimate			1.50%
Maximum [Member] | Year 2017 [Member]
Medicare Reimbursement [Abstract]
Annual limit on physical therapy and speech language pathology services			$ 1,980
Annual limit occupational therapy services			$ 1,980
Maximum [Member] | Furniture & Equipment [Member]
Long-Lived Assets [Abstract]
Estimated useful lives			8 years
Maximum [Member] | Software [Member]
Long-Lived Assets [Abstract]
Estimated useful lives			7 years
Maximum [Member] | Leasehold Improvements [Member]
Long-Lived Assets [Abstract]
Estimated useful lives			5 years
Net Patient Revenues [Member]
Revenue Recognition [Abstract]
Revenue related to the various categories			$ 373,340,000	433,345,000	417,703,000
Management Contract Revenues [Member]
Revenue Recognition [Abstract]
Revenue related to the various categories			8,410,000	8,676,000	8,339,000
Other Revenues [Member]
Revenue Recognition [Abstract]
Revenue related to the various categories			2,020,000	2,486,000	2,403,000
Physical Therapy Operations [Member]
Revenue Recognition [Abstract]
Revenue related to the various categories			383,770,000	444,507,000	428,445,000
Industrial Injury Prevention Services Revenues [Member]
Revenue Recognition [Abstract]
Revenue related to the various categories			$ 39,199,000	$ 37,462,000	$ 25,466,000

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