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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) (USD $)	3 Months Ended		12 Months Ended
	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			4usph_NumberOfIndividualClinicsAcquiredInSeparateTransactions
Number of clinics operated	494usph_NumberOfClinicsOperated
Number of states where clinics are operated	42us-gaap_NumberOfStatesInWhichEntityOperates
Number of business segments	1us-gaap_NumberOfOperatingSegments
Number of regions	6usph_NumberOfRegions
Federal debt ceiling in connection with deficit reductions	10 years
Reductions in federal spending	$ 1,200,000,000,000usph_AmountOfReductionsInFederalSpending
Medicare spending cut percentage (in hundredths)	2.00%usph_ReductionInMedicareSpendingPercentage
Combined physical therapy/speech language pathology expenses	3,700usph_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	0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Accrued interest and penalties associated with any unrecognized tax benefits	0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Interest expense recognized	0us-gaap_InterestExpenseOnPrepetitionLiabilitiesRecognizedInStatementOfOperations	0us-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	1,940usph_AnnualLimitOnPhysicalTherapyAndSpeechLanguagePathologyServices / us-gaap_RangeAxis = us-gaap_MaximumMember	1,920usph_AnnualLimitOnPhysicalTherapyAndSpeechLanguagePathologyServices / us-gaap_RangeAxis = us-gaap_MaximumMember
Annual limit occupational therapy services	$ 1,940usph_AnnualLimitOccupationalTherapyServices / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 1,920usph_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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