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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details)								1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) Clinic Location State	Mar. 31, 2021 USD ($) Clinic	Nov. 30, 2020 USD ($) Clinic Installment	Sep. 30, 2020 USD ($) Installment Contract	Feb. 27, 2020 USD ($) Partnership Clinic	Apr. 11, 2019 State Location	Apr. 30, 2018 Business	Mar. 31, 2021 USD ($) Clinic	Jun. 30, 2021 USD ($) Location Clinic State	Sep. 30, 2020 USD ($) Contract	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Facility Location Clinic State Segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) Region	Dec. 31, 2019 Region	Mar. 31, 2017
Basis of Presentation [Abstract]
Number of reportable segments | Segment												2
Percentage of general partnership interest owned												1.00%
Number of businesses acquired | Clinic	8
Number of closed clinics sold | Clinic	2								2			2
Aggregate sale price of clinics												$ 100,000
Number of clinics operated | Clinic	575								575			575
Number of states where clinics are operated | State	39								39			39
Number of third party facilities | Facility												39
Deferment of depositing employer's share social security taxes included in accrued liabilities	$ 4,100,000								$ 4,100,000			$ 4,100,000
Deferment of depositing employer's share social security taxes other long-term liabilities	4,200,000								4,200,000			4,200,000
Relief funds									0		$ 7,959,000	0	$ 7,959,000
Long-Lived Assets [Abstract]
Impairment of long lived assets to be disposed of												0
Goodwill [Abstract]
Number of regions | Region														6	6
Derecognition (write-off) of goodwill - closed clinics									0		$ 0	0	$ 1,859,000	$ 1,859,000
Income Taxes [Abstract]
Unrecognized tax benefit												0
Accrued interest and penalties associated with any unrecognized tax benefits	0								0			0
Interest expense recognized												$ 0
Segment Reporting [Abstract]
Number of operating segments | Segment												2
Medicare Accelerated and Advance Payments Program [Member]
Basis of Presentation [Abstract]
Repayment of funds	14,100,000								14,100,000			$ 14,100,000
Public Health and Social Services Emergency Fund [Member]
Basis of Presentation [Abstract]
Grants and other funds	100,000,000,000.0								100,000,000,000.0			100,000,000,000.0
Funds received	$ 13,500,000								$ 13,500,000			13,500,000
Relief funds												$ 0
Clinic Practice [Member]
Basis of Presentation [Abstract]
Percentage of interest acquired	65.00%	70.00%	75.00%		65.00%			70.00%	65.00%			65.00%
Number of businesses acquired | Clinic	8	5	3		4			5
Percentage of interest the founder will retain	35.00%	30.00%						30.00%	35.00%			35.00%
Aggregate purchase price for the acquired clinic practices	$ 10,300,000	$ 12,000,000.0	$ 8,900,000		$ 11,900,000			$ 12,000,000.0
Cash paid for acquisition of interest in clinic	9,000,000.0	11,700,000	8,600,000		11,600,000			11,700,000
Payable for achievement of certain business criteria	1,000,000.0								$ 1,000,000.0			$ 1,000,000.0
Seller notes	$ 300,000	$ 300,000	$ 300,000		$ 300,000			$ 300,000	$ 300,000			$ 300,000
Percentage of interest accrued	3.25%	3.25%	3.25%		4.75%			3.25%	3.25%			3.25%
Number of installments | Installment			2
Principal installments			$ 162,500
Number of partnerships | Partnership					4
IIPS [Member]
Basis of Presentation [Abstract]
Percentage of interest acquired						100.00%
Percentage of interest accrued							65.00%									55.00%
Number of businesses merged | Business							2
Percentage of combined business interest owned						76.00%	59.45%
Number of states of network services | State						45
Number of onsite client locations | Location						11
Management Contracts [Member]
Basis of Presentation [Abstract]
Percentage of interest acquired				70.00%						70.00%
Aggregate purchase price for the acquired clinic practices				$ 4,200,000
Cash paid for acquisition of interest in clinic				3,700,000
Seller notes				$ 500,000						$ 500,000
Number of installments | Installment				2
Number of management contracts | Contract				6						6
Management Contracts [Member] | Notes Payable One [Member]
Basis of Presentation [Abstract]
Seller notes			300,000	$ 200,000						$ 200,000
Percentage of interest accrued				5.00%						5.00%
Management Contracts [Member] | Notes Payable Two [Member]
Basis of Presentation [Abstract]
Seller notes			$ 300,000	$ 200,000						$ 200,000
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]
Basis of Presentation [Abstract]
Percentage of limited partnership interest owned												49.00%
Redeemable Non-Controlling Interests [Abstract]
Redeemable non-controlling interest, redemption rights, commencement period												3 years
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
Minimum [Member] | Clinic Practice [Member]
Basis of Presentation [Abstract]
Percentage of interest acquired					10.00%
Maximum [Member]
Basis of Presentation [Abstract]
Percentage of limited partnership interest owned												99.00%
Number of operating clinic locations | Location	1								1			1
Redeemable Non-Controlling Interests [Abstract]
Redeemable non-controlling interest, redemption rights, commencement period												5 years
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
Maximum [Member] | Clinic Practice [Member]
Basis of Presentation [Abstract]
Percentage of interest acquired					83.80%

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Name:	usph_NumberOfPartnershipInWhichInterestAcquired
Namespace Prefix:	usph_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Number of regions of the entity operates.

+ References

No definition available.

+ Details

Name:	usph_NumberOfRegions
Namespace Prefix:	usph_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

This element represents number of states of network services provided by the company.

+ References

No definition available.

+ Details

Name:	usph_NumberOfStatesOfNetworkServices
Namespace Prefix:	usph_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- Definition

Number of third party facilities.

+ References

No definition available.

+ Details

Name:	usph_NumberOfThirdPartyFacilities
Namespace Prefix:	usph_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of combined business interest owned during the period.

+ References

No definition available.

+ Details

Name:	usph_PercentageOfCombinedBusinessInterestOwned
Namespace Prefix:	usph_
Data Type:	dtr-types:percentItemType
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Period Type:	duration

X

- Definition

Percentage of general partnership interest owned during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	usph_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Percentage of interest the founder will retain after acquisition of five-clinic physical therapy practice.

+ References

No definition available.

+ Details

Name:	usph_PercentageOfInterestTheFounderWillRetain
Namespace Prefix:	usph_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of limited partnership interest owned during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	usph_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

The commencement period of redemption rights for redeemable non controlling interest, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Definition

Relief funds relates to social welfare, a fund of money set up to provide aid for people in need, especially in disaster areas.

+ References

No definition available.

+ Details

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Namespace Prefix:	usph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of repayment to Medicare Accelerated and Advance Payment Program ("MAAPP Funds") rather than applying them to future services performed.

+ References

No definition available.

+ Details

Name:	usph_RepaymentOfFunds
Namespace Prefix:	usph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=usph_PublicHealthAndSocialServicesEmergencyFundMember
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- Details

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- Details

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Balance Type:
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- Details

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- Details

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- Details

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- Details

Name:	srt_TitleOfIndividualAxis=usph_EmployeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	srt_TitleOfIndividualAxis=srt_DirectorMember
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Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	srt_TitleOfIndividualAxis=srt_OfficerMember
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Data Type:	na
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- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
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- Details

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- Details

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- Details

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