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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 Segment Region State Clinic | Mar. 31, 2014 | Dec. 31, 2014 Clinic
Depreciation Amortization Impairment [Line Items] |  |  |
Percentage of general partnership interest owned (in hundredths) | 1.00%usph_PercentageOfGeneralPartnershipInterestOwned |  |
Percentage of limited partnership interest owned (in hundredths) | 64.00%usph_PercentageOfLimitedPartnershipInterestOwned |  |
Number of individual clinics acquired in separate transactions |  |  | 4 usph_NumberOfIndividualClinicsAcquiredInSeparateTransactions
Number of clinics operated | 494 usph_NumberOfClinicsOperated |  |
Number of states where clinics are operated | 42 us-gaap_NumberOfStatesInWhichEntityOperates |  |
Number of business segments | 1 us-gaap_NumberOfOperatingSegments |  |
Number of regions | 6 usph_NumberOfRegions |  |
Federal debt ceiling in connection with deficit reductions | 10 years |  |
Reductions in federal spending | $ 1,200,000,000,000 usph_AmountOfReductionsInFederalSpending |  |
Medicare spending cut percentage (in hundredths) | 2.00%usph_ReductionInMedicareSpendingPercentage |  |
Combined physical therapy/speech language pathology expenses | 3,700 usph_CombinedPhysicalTherapySpeechLanguagePathologyExpenses |  |
Percentage of practice expense component (in hundredths) | 100.00%usph_PercentageOfPracticeExpenseComponentOfRelativeValueUnit |  |
Percentage reduction for service (in hundredths) | 20.00%usph_PercentageReductionForServiceInOfficeOrOtherNonInstitutionalSettings |  |
Percentage reduction for service in institutional settings (in hundredths) | 25.00%usph_PercentageReductionForServiceInInstitutionalSettings |  |
Percentage of increased payment reduction (in hundredths) | 50.00%usph_PercentageIncreaseInPaymentReductionInInstitutionalOrNonInstitutionalSetting |  |
Difference between net revenues and corresponding cash collections, approximately of net revenues (in hundredths) | 1.00%usph_DifferenceBetweenNetRevenuesAndCorrespondingCashCollectionsReflectedPercentageOfNetRevenues |  |
Maximum difference between actual aggregate contractual reserve and estimated contractual allowance reserve (in hundredths) | 1.00%usph_MaximumDifferenceBetweenActualAggregateContractualReservePercentagesAsComparedToEstimatedContractualAllowanceReservePercentage |  |
Minimum difference between actual aggregate contractual reserve and estimated contractual allowance reserve (in hundredths) | 1.00%usph_MinimumDifferenceBetweenActualAggregateContractualReservePercentagesComparedToEstimatedContractualAllowanceReservePercentage |  |
Minimum percentage of fair value reporting unit less than carrying amount (in hundredths) | 50.00%usph_MinimumPercentageOfFairValueReportingUnitLessThanCarryingAmount |  |
Unrecognized tax benefit | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense |
Accrued interest and penalties associated with any unrecognized tax benefits | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |
Interest expense recognized | 0 us-gaap_InterestExpenseOnPrepetitionLiabilitiesRecognizedInStatementOfOperations | 0 us-gaap_InterestExpenseOnPrepetitionLiabilitiesRecognizedInStatementOfOperations |
Year 2016 [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Expected reduction in Medicare spending percentage (in hundredths) | 2.00%usph_ExpectedReductionInMedicareSpendingPercentage / us-gaap_UnusualOrInfrequentItemAxis = usph_Year2016Member |  |
Year 2017 [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Expected reduction in Medicare spending percentage (in hundredths) | 2.00%usph_ExpectedReductionInMedicareSpendingPercentage / us-gaap_UnusualOrInfrequentItemAxis = usph_Year2017Member |  |
Through December 31, 2014 [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Percentage of increase in payment for service (in hundredths) | 0.50%usph_PercentageOfIncreaseInPaymentForService / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = usph_ThroughDecemberThirtyFirstTwoThousandFourteenMember |  |
January 1, 2015 through June 30, 2015 [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Percentage of medicare payment (in hundredths) | 0.00%usph_PercentageOfMedicarePayment / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = usph_JanuaryFirstTwoThousandFifteenThroughJuneThirtyTwoThousandFifteenMember |  |
July 1, 2015 through December 31, 2015 [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Percentage of medicare payment (in hundredths) | 0.50%usph_PercentageOfMedicarePayment / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = usph_JulyFirstTwoThousandFifteenThroughDecemberThirtyFirstTwoThousandFifteenMember |  |
From 2016 through 2019 [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Percentage of medicare payment (in hundredths) | 0.50%usph_PercentageOfMedicarePayment / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = usph_FromTwoThousandSixteenThroughTwoThousandNineteenMember |  |
Minimum [Member] | Furniture & Equipment [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Minimum [Member] | Computer Software, Intangible Asset [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Minimum [Member] | Leasehold Improvements [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Maximum [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Annual limit on physical therapy and speech language pathology services | 1,940 usph_AnnualLimitOnPhysicalTherapyAndSpeechLanguagePathologyServices / us-gaap_RangeAxis = us-gaap_MaximumMember | 1,920 usph_AnnualLimitOnPhysicalTherapyAndSpeechLanguagePathologyServices / us-gaap_RangeAxis = us-gaap_MaximumMember |
Annual limit occupational therapy services | $ 1,940 usph_AnnualLimitOccupationalTherapyServices / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 1,920 usph_AnnualLimitOccupationalTherapyServices / us-gaap_RangeAxis = us-gaap_MaximumMember |
Maximum [Member] | Furniture & Equipment [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Estimated useful lives | 8 years |  |
Maximum [Member] | Computer Software, Intangible Asset [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Estimated useful lives | 7 years |  |
Maximum [Member] | Leasehold Improvements [Member] |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |
Estimated useful lives | 5 years |  |

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