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ACQUISITIONS OF BUSINESSES (Details) |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Sep. 30, 2020 USD ($) Contract | Feb. 27, 2020 USD ($) Partnership Clinic | Sep. 30, 2019 USD ($) Clinic Installment | Apr. 11, 2019 USD ($) Location State | Sep. 30, 2020 USD ($) Contract | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) Partnership | Apr. 30, 2018 | Mar. 31, 2017
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of partnerships in which interest acquired | Partnership |  |  |  |  |  |  |  |  |  | 4 |  |
Cash paid, net of cash acquired |  |  |  |  |  |  |  | $ 15,322,000 | $ 30,365,000 |  |  |
Estimated fair value of net tangible assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Sale of non-controlling interest percentage in partnership one |  |  |  |  |  |  |  |  |  | 1.00% |  |
Tax effect on sale price |  |  |  |  |  |  |  |  |  | $ 196,000 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  |  |  |  | 1.00% |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  |  |  |  | 55.00% |  |
Referral Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of net tangible assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of acquired intangibles |  |  |  |  |  |  |  | 11 years |  | 11 years |  |
Non-compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of net tangible assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of acquired intangibles |  |  |  |  |  |  |  | 6 years |  | 6 years |  |
Physical Therapy Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash paid, net of cash acquired |  |  |  | $ 12,170,000 |  |  |  |  |  |  |  |
Payable to shareholders of seller |  |  |  | 0 |  |  |  |  | 0 |  |  |
Seller note |  |  |  | 300,000 |  |  |  |  | 300,000 |  |  |
Total consideration |  |  |  | 12,470,000 |  |  |  |  | 12,470,000 |  |  |
Estimated fair value of net tangible assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total current assets |  |  |  | 650,000 |  |  |  |  | 650,000 |  |  |
Total non-current assets |  |  |  | 3,019,000 |  |  |  |  | 3,019,000 |  |  |
Total liabilities |  |  |  | (2,816,000) |  |  |  |  | (2,816,000) |  |  |
Net tangible assets acquired |  |  |  | 853,000 |  |  |  |  | 853,000 |  |  |
Referral relationships |  |  |  | 2,600,000 |  |  |  |  | 2,600,000 |  |  |
Non-compete |  |  |  | 270,000 |  |  |  |  | 270,000 |  |  |
Tradename |  |  |  | 740,000 |  |  |  |  | 740,000 |  |  |
Goodwill |  |  |  | 14,237,000 |  |  |  |  | 14,237,000 |  |  |
Fair value of non-controlling interest (classified as redeemable non-controlling interests) |  |  |  | (6,230,000) |  |  |  |  | (6,230,000) |  |  |
Total consideration |  |  |  | 12,470,000 |  |  |  |  | 12,470,000 |  |  |
Management Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [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] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 70.00% |  |  |  |  | 70.00% | 70.00% |  |  |  |
Management Contracts [Member] | Notes Payable One [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest accrued |  | 5.00% |  |  |  |  | 5.00% | 5.00% |  |  |  |
Seller note |  | $ 200,000 |  |  |  |  | $ 200,000 | $ 200,000 |  |  |  |
Management Contracts [Member] | Notes Payable Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest accrued |  | 5.00% |  |  |  |  | 5.00% | 5.00% |  |  |  |
Seller note |  | $ 300,000 |  |  |  |  | $ 300,000 | $ 300,000 |  |  |  |
IIPS [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  | 100.00% |  |  |  |  |  | 65.00% | 55.00%
Number of states of network services | State |  |  |  |  | 45 |  |  |  |  |  |  |
Number of onsite client locations | Location |  |  |  |  | 11 |  |  |  |  |  |  |
Aggregate purchase price for the acquired clinic practices |  |  |  |  | $ 23,600,000 |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  |  | $ 18,900,000 |  |  |  |  |  |  |
Percentage of interest accrued |  |  |  |  | 5.50% |  |  |  |  |  |  |
Net of cash acquired |  |  |  |  | $ 700,000 |  |  |  |  |  |  |
Cash paid, net of cash acquired | [1] |  |  |  | 18,428,000 |  |  |  |  |  |  |
Payable to shareholders of seller | [1] |  |  |  | 485,000 |  |  |  |  |  |  |
Seller note |  |  |  | $ 4,000,000.0 | 4,000,000 | [1] |  |  | $ 4,000,000.0 |  |  |
Total consideration | [1] |  |  |  | 22,913,000 |  |  |  |  |  |  |
Estimated fair value of net tangible assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total current assets | [1] |  |  |  | 1,641,000 |  |  |  |  |  |  |
Total non-current assets | [1] |  |  |  | 848,000 |  |  |  |  |  |  |
Total liabilities | [1] |  |  |  | (2,978,000) |  |  |  |  |  |  |
Net tangible assets acquired | [1] |  |  |  | (489,000) |  |  |  |  |  |  |
Referral relationships | [1] |  |  |  | 3,400,000 |  |  |  |  |  |  |
Non-compete | [1] |  |  |  | 250,000 |  |  |  |  |  |  |
Tradename | [1] |  |  |  | 1,300,000 |  |  |  |  |  |  |
Goodwill | [1] |  |  |  | 18,452,000 |  |  |  |  |  |  |
Fair value of non-controlling interest (classified as redeemable non-controlling interests) | [1] |  |  |  | 0 |  |  |  |  |  |  |
Total consideration | [1] |  |  |  | $ 22,913,000 |  |  |  |  |  |  |
Clinic Practice [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  | 65.00% | 67.00% |  |  |  |  | 67.00% |  |  |
Number of clinics | Clinic |  |  | 4 | 11 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Number of installments | Installment |  |  |  | 2 |  |  |  |  |  |  |  |
Principal installments |  |  |  | $ 150,000 |  |  |  |  | $ 150,000 |  |  |
Number of partnerships in which interest acquired | Partnership |  |  | 4 |  |  |  |  |  |  |  |  |
Percentage of interest accrued |  |  | 4.75% | 5.00% |  |  |  |  | 5.00% |  |  |
Seller note |  |  | $ 300,000 | $ 300,000 |  |  |  |  | $ 300,000 |  |  |
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 |  |  |  |  |  |  |  |  |  | $ 30,598,000 |  |
Payable to shareholders of seller |  |  |  |  |  |  |  |  |  | 485,000 |  |
Seller note |  |  |  |  |  |  |  |  |  | 4,300,000 |  |
Total consideration |  |  |  |  |  |  |  |  |  | 35,383,000 |  |
Estimated fair value of net tangible assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total current assets |  |  |  |  |  |  |  |  |  | 2,291,000 |  |
Total non-current assets |  |  |  |  |  |  |  |  |  | 3,867,000 |  |
Total liabilities |  |  |  |  |  |  |  |  |  | (5,794,000) |  |
Net tangible assets acquired |  |  |  |  |  |  |  |  |  | 364,000 |  |
Referral relationships |  |  |  |  |  |  |  |  |  | 6,000,000 |  |
Non-compete |  |  |  |  |  |  |  |  |  | 520,000 |  |
Tradename |  |  |  |  |  |  |  |  |  | 2,040,000 |  |
Goodwill |  |  |  |  |  |  |  |  |  | 32,689,000 |  |
Fair value of non-controlling interest (classified as redeemable non-controlling interests) |  |  |  |  |  |  |  |  |  | (6,230,000) |  |
Total consideration |  |  |  |  |  |  |  |  |  | $ 35,383,000 |  |
Acquisitions [Member] | Physical Therapy Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash paid, net of cash acquired |  |  |  |  |  |  |  | 15,322,000 |  |  |  |
Seller note |  | 796,000 |  |  |  |  | 796,000 | 796,000 |  |  |  |
Total consideration |  | 16,118,000 |  |  |  |  | 16,118,000 | 16,118,000 |  |  |  |
Estimated fair value of net tangible assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total current assets |  | 778,000 |  |  |  |  | 778,000 | 778,000 |  |  |  |
Total non-current assets |  | 400,000 |  |  |  |  | 400,000 | 400,000 |  |  |  |
Total liabilities |  | (469,000) |  |  |  |  | (469,000) | (469,000) |  |  |  |
Net tangible assets acquired |  | 709,000 |  |  |  |  | 709,000 | 709,000 |  |  |  |
Referral relationships |  | 1,600,000 |  |  |  |  | 1,600,000 | 1,600,000 |  |  |  |
Non-compete |  | 750,000 |  |  |  |  | 750,000 | 750,000 |  |  |  |
Tradename |  | 1,500,000 |  |  |  |  | 1,500,000 | 1,500,000 |  |  |  |
Goodwill |  | 19,824,000 |  |  |  |  | 19,824,000 | 19,824,000 |  |  |  |
Fair value of non-controlling interest (classified as redeemable non-controlling interests) |  | (8,265,000) |  |  |  |  | (8,265,000) | (8,265,000) |  |  |  |
Total consideration |  | $ 16,118,000 |  |  |  |  | $ 16,118,000 | $ 16,118,000 |  |  |  |
Briotix Health [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  | 76.00% |  |  |  |  |  |  |
[1] | Industrial injury prevention services

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- 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 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

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- 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 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
- 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
- Definition Refers to noncontrolling percentage sold by an entity during the period. + References No definition available. + Details
Name: | usph_SaleOfNoncontrollingInterestPercentageInPartnershipOne
Namespace Prefix: | usph_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to amount of tax effected on noncontrolling interest sale price during the period. + References No definition available. + Details
Name: | usph_TaxEffectOnSaleOfNoncontrollingInterest
Namespace Prefix: | usph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- 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_StatementBusinessSegmentsAxis=usph_PhysicalTherapyOperationsMember
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: |

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- Details
Name: | us-gaap_ShortTermDebtTypeAxis=usph_NotesPayableTwoMember
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_ClinicPracticeMember
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: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=usph_BriotixHealthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |