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ACQUISITIONS OF BUSINESSES (Details)							1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) Clinic	Mar. 31, 2021 USD ($) Clinic	Nov. 30, 2020 USD ($) Installment Clinic	Sep. 30, 2020 USD ($) Contract Installment	Feb. 27, 2020 USD ($) Clinic Partnership	Mar. 31, 2021 USD ($) Clinic	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($) Contract	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Business Combination, Description [Abstract]
Annual revenue								$ 123,580,000	$ 106,925,000	$ 357,578,000	$ 299,759,000
Number of clinics | Clinic		8
Cash paid, net of cash acquired										$ 22,589,000	$ 15,322,000
Referral Relationships [Member]
Estimated fair value of net tangible assets acquired [Abstract]
Estimated useful lives of acquired intangibles										12 years		13 years
Non-compete Agreements [Member]
Estimated fair value of net tangible assets acquired [Abstract]
Estimated useful lives of acquired intangibles										6 years		6 years
Return-to-work and Ergonomic Services [Member]
Business Combination, Description [Abstract]
Aggregate purchase price for the acquisition	$ 2,700,000
Contingent payment consideration	600,000							$ 600,000		$ 600,000
Cash paid for acquisition	$ 2,400,000
Percentage of interest accrued	3.25%							3.25%		3.25%
Seller notes	$ 300,000							$ 300,000		$ 300,000
Return-to-work and Ergonomic Services [Member] | Minimum [Member]
Business Combination, Description [Abstract]
Annual revenue												$ 2,000,000.0
Management Contracts [Member]
Business Combination, Description [Abstract]
Percentage of interest acquired					70.00%				70.00%		70.00%
Number of management contracts | Contract					6				6
Aggregate purchase price for the acquisition					$ 4,200,000
Cash paid for acquisition					$ 3,700,000
Number of installments | Installment					2
Seller notes					$ 500,000				$ 500,000		$ 500,000
Management Contracts [Member] | Notes Payable One [Member]
Business Combination, Description [Abstract]
Seller notes				$ 300,000
Management Contracts [Member] | Notes Payable Two [Member]
Business Combination, Description [Abstract]
Seller notes	200,000							200,000		200,000
Clinic Practice [Member]
Business Combination, Description [Abstract]
Percentage of interest acquired		65.00%	70.00%	75.00%		65.00%	70.00%
Percentage of interest retained by practice founder		35.00%	30.00%				30.00%
Number of clinics | Clinic		8	5	3		4	5
Aggregate purchase price for the acquisition		$ 10,300,000	$ 12,000,000.0	$ 8,900,000		$ 11,900,000	$ 12,000,000.0
Contingent payment consideration		800,000
Cash paid for acquisition		$ 9,000,000.0	$ 11,700,000	$ 8,600,000		$ 11,600,000	$ 11,700,000
Number of installments | Installment				2
Principal installments				$ 162,500
Number of partnerships in which interest acquired | Partnership						4
Percentage of interest accrued		3.25%	3.25%	3.25%		4.75%	3.25%
Seller notes		$ 300,000	$ 300,000	$ 300,000		$ 300,000	$ 300,000
Payable		$ 1,000,000.0
Clinic Practice [Member] | Minimum [Member]
Business Combination, Description [Abstract]
Percentage of interest acquired						10.00%
Clinic Practice [Member] | Maximum [Member]
Business Combination, Description [Abstract]
Percentage of interest acquired						83.80%
Acquisitions [Member]
Business Combination, Description [Abstract]
Cash paid, net of cash acquired										22,589,000		23,911,000
Seller notes	800,000							800,000		800,000		1,121,000
Payable	1,000,000							1,000,000		1,000,000
Total consideration	24,389,000							24,389,000		24,389,000		25,032,000
Estimated fair value of net tangible assets acquired [Abstract]
Total current assets	1,194,000							1,194,000		1,194,000		1,271,000
Total non-current assets	6,547,000							6,547,000		6,547,000		196,000
Total liabilities	(7,559,000)							(7,559,000)		(7,559,000)		(556,000)
Net tangible assets acquired	182,000							182,000		182,000		911,000
Referral relationships	3,424,000							3,424,000		3,424,000		5,520,000
Non-compete	562,000							562,000		562,000		500,000
Tradename	1,577,000							1,577,000		1,577,000		1,890,000
Goodwill	29,363,000							29,363,000		29,363,000		27,509,000
Fair value of non-controlling interest (classified as redeemable non-controlling interest)	(10,719,000)							(10,719,000)		(10,719,000)		(11,298,000)
Total consideration	$ 24,389,000							$ 24,389,000		$ 24,389,000		$ 25,032,000

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

X

- Definition

This element represents the fair value of the redeemable noncontrolling interest in the acquiree at the acquisition date.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of non-competition agreements recognized as of the acquisition date.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of referral relationships at the acquisition date.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of tradename recognized as of the acquisition date.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	usph_EstimatedFairValueOfNetTangibleAssetsAcquiredAbstract
Namespace Prefix:	usph_
Data Type:	xbrli:stringItemType
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 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

Payments to acquire businesses total consideration.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=usph_ReferralRelationshipMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_NoncompeteAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=usph_ReturnToWorkAndErgonomicServicesMember
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_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:	us-gaap_BusinessAcquisitionAxis=usph_ClinicPracticeMember
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:

X

- Details

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