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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details)							3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) Clinic Contract State	Feb. 27, 2020 USD ($) Partnership Clinic	Sep. 30, 2019 USD ($) Clinic Installment	Apr. 11, 2019 USD ($) Location State		Apr. 30, 2018 Business	Sep. 30, 2020 USD ($) Volume Clinic Contract State	Jun. 30, 2020 Volume	Mar. 31, 2020 Employee Volume	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Clinic Installment State Segment Facility	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) Partnership	May 02, 2020 Employee	Mar. 31, 2017
Basis of Presentation [Abstract]
Number of reportable segments | Segment											2
Average physical therapy patient volumes per day per clinic | Volume							25.8	18.9	26.2
Percentage of general partnership interest owned											1.00%
Number of partnerships | Partnership													4
Number of closed clinics sold | Clinic	12						12				12
Aggregate sale price of clinics											$ 1,100,000
Cash received related to sale of closed clinics	$ 700,000						$ 700,000				700,000
Note receivable related to sale of closed clinics	$ 400,000						$ 400,000				$ 400,000
Number of installments for note receivable | Installment											2
Number of clinics operated | Clinic	550						550				550
Number of states where clinics are operated | State	39						39				39
Number of third party facilities | Facility											38
Percentage of employees furloughed or terminated									40.00%
Number of full and part-time workforce | Employee									5,500
Number of furloughed employees returned | Employee														1,200
Relief funds							$ 390,000			$ 0	$ 8,349,000	$ 0
Deferment of depositing employer's share social security taxes included in accrued liabilities	$ 4,900,000						4,900,000				4,900,000
Long-Lived Assets [Abstract]
Impairment of long lived assets							0
Impairment of long lived assets to be disposed of							0
Goodwill [Abstract]
Write-off of goodwill - closed clinics							0			$ 0	1,859,000	$ 0	$ 0
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
Other Income [Member]
Basis of Presentation [Abstract]
Relief funds							400,000				$ 8,300,000
Medicare Accelerated and Advance Payments Program [Member]
Basis of Presentation [Abstract]
Cash and cash equivalents and accrued liabilities	12,900,000						12,900,000				12,900,000
Public Health and Social Services Emergency Fund [Member]
Basis of Presentation [Abstract]
Funds received	8,300,000						8,300,000				8,300,000
Grants and other funds	$ 100,000,000,000.0						100,000,000,000.0				100,000,000,000.0
Relief funds											8,300,000
Public Health and Social Services Emergency Fund [Member] | Other Income [Member]
Basis of Presentation [Abstract]
Relief funds							$ 400,000				$ 8,300,000
Clinic Practice [Member]
Basis of Presentation [Abstract]
Percentage of interest acquired		65.00%	67.00%							67.00%		67.00%
Number of partnerships | Partnership		4
Aggregate purchase price for the acquired clinic practices		$ 11,900,000	$ 12,400,000
Cash paid for acquisition of interest in clinic		11,600,000	12,100,000
Seller note		$ 300,000	$ 300,000							$ 300,000		$ 300,000
Percentage of interest accrued		4.75%	5.00%							5.00%		5.00%
Number of installments | Installment			2
Principal installments			$ 150,000							$ 150,000		$ 150,000
Number of businesses acquired | Clinic		4	11
IIPS [Member]
Basis of Presentation [Abstract]
Number of states of network services | State				45
Number of onsite client locations | Location				11
Percentage of interest acquired				100.00%		65.00%									55.00%
Aggregate purchase price for the acquired clinic practices				$ 23,600,000
Cash paid for acquisition of interest in clinic				18,900,000
Seller note			$ 4,000,000.0	$ 4,000,000	[1]					$ 4,000,000.0		$ 4,000,000.0
Percentage of interest accrued				5.50%
Number of businesses merged | Business						2
Percentage of combined business interest owned				76.00%		59.45%
Management Contracts [Member]
Basis of Presentation [Abstract]
Percentage of interest acquired	70.00%						70.00%				70.00%
Number of management contracts | Contract	6						6
Remaining contract term	5 years						5 years
Aggregate purchase price for the acquired clinic practices	$ 4,200,000
Cash paid for acquisition of interest in clinic	3,700,000
Seller note	500,000						$ 500,000				$ 500,000
Management Contracts [Member] | Notes Payable One [Member]
Basis of Presentation [Abstract]
Seller note	$ 200,000						$ 200,000				$ 200,000
Percentage of interest accrued	5.00%						5.00%				5.00%
Management Contracts [Member] | Notes Payable Two [Member]
Basis of Presentation [Abstract]
Seller note	$ 300,000						$ 300,000				$ 300,000
Percentage of interest accrued	5.00%						5.00%				5.00%
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]
Basis of Presentation [Abstract]
Percentage of limited partnership interest owned											49.00%
Percentage of interest acquired													1.00%
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%
Percentage of interest acquired													55.00%
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%
Maximum [Member] | Management Contracts [Member]
Basis of Presentation [Abstract]
Percentage of interest acquired	70.00%						70.00%				70.00%
[1] Industrial injury prevention services

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Name:	usph_NonControllingInterestRedeemableAbstract
Namespace Prefix:	usph_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Note receivable related to sale of discontinued clinics

+ References

No definition available.

+ Details

Name:	usph_NoteReceivableRelatedToSaleOfClinics
Namespace Prefix:	usph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Number of businesses merged during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Number of clinics operated during the period.

+ References

No definition available.

+ Details

Name:	usph_NumberOfClinicsOperated
Namespace Prefix:	usph_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of closed clinics sold during the period

+ References

No definition available.

+ Details

Name:	usph_NumberOfClosedClinicsSold
Namespace Prefix:	usph_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of furloughed employees returned to work.

+ References

No definition available.

+ Details

Name:	usph_NumberOfFurloughedEmployeesReturned
Namespace Prefix:	usph_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of installments for note receivable in sale consideration.

+ References

No definition available.

+ Details

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

X

- Definition

The number of management contracts during period.

+ References

No definition available.

+ Details

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

X

- Definition

Number of client locations that included in total operated states that are providing industrial injury prevention services.

+ References

No definition available.

+ Details

Name:	usph_NumberOfOnsiteClientLocations
Namespace Prefix:	usph_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of partnership in which interest acquired during the period.

+ References

No definition available.

+ Details

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

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

X

- 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:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of employees furloughed or terminated due to pandemic.

+ References

No definition available.

+ Details

Name:	usph_PercentageOfEmployeesFurloughedOrTerminated
Namespace Prefix:	usph_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of general partnership interest owned during the period.

+ References

No definition available.

+ Details

Name:	usph_PercentageOfGeneralPartnershipInterestOwned
Namespace Prefix:	usph_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of limited partnership interest owned during the period.

+ References

No definition available.

+ Details

Name:	usph_PercentageOfLimitedPartnershipInterestOwned
Namespace Prefix:	usph_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Refers to the commencement period of redemption rights for redeemable non controlling interest.

+ References

No definition available.

+ Details

Name:	usph_RedeemableNonControllingInterestRedemptionRightsCommencementPeriod
Namespace Prefix:	usph_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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

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

X

- Definition

Remaining term of contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	usph_RemainingContractTerm
Namespace Prefix:	usph_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=usph_MedicareAcceleratedAndAdvancePaymentsProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=usph_PublicHealthAndSocialServicesEmergencyFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=usph_ClinicPracticeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=usph_LeadingProviderOfIndustrialInjuryPreventionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=usph_ManagementContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=usph_NotesPayableOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=usph_NotesPayableTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_TitleOfIndividualAxis=usph_EmployeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	srt_TitleOfIndividualAxis=srt_OfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerSoftwareIntangibleAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: