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Significant Accounting Policies (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Region
Segment
Dec. 31, 2013
Dec. 31, 2012
Depreciation Amortization Impairment [Line Items]      
Number of business segments 1us-gaap_NumberOfOperatingSegments    
Number of regions 6usph_NumberOfRegions    
Exercisable non controlling interest with put rights   $ 0usph_ExercisableNoncontrollingInterestWithPutRights  
Percentage of reduction prevented in Medicare Fee rate (in hundredths) 20.10%usph_PercentageOfReductionPrevented    
Medicare service fees, description The Protecting Access to Medicare Act of 2014 temporarily blocks this reduction through March 31, 2015 and replaces it with a 0.5% payment increase for services provided through December 31, 2014.    
Effective date of reduction in Medicare physician fee payment rate Apr. 01, 2013    
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    
Expected reduction in Medicare spending percentage (in hundredths) 2.00%usph_ExpectedReductionInMedicareSpendingPercentage    
Effective date of change in annual limit on outpatient therapy services Jan. 01, 2015    
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    
Net revenue from Medicare accounts 63,800,000usph_NetRevenueFromMedicare    
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 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Interest expense recognized 0us-gaap_InterestExpenseOnPrepetitionLiabilitiesRecognizedInStatementOfOperations 0us-gaap_InterestExpenseOnPrepetitionLiabilitiesRecognizedInStatementOfOperations  
Stock option compensation 0us-gaap_AllocatedShareBasedCompensationExpense 0us-gaap_AllocatedShareBasedCompensationExpense  
Granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Number of shares, outstanding (in shares) 700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber    
Shares granted to employees lapse in equal installments on the following four or five annual anniversaries of the date of grant Shares granted to employees lapse in equal installments on the following four annual anniversaries of the date of grant    
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		    
Through December 31, 2015 [Member]      
Depreciation Amortization Impairment [Line Items]      
Percentage of increase in payment for service (in hundredths) 1.00%usph_PercentageOfIncreaseInPaymentForService
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= usph_ThroughDecemberThirtyFirstTwoThousandFifteenMember		    
January 1, 2015 through March 31, 2015 [Member]      
Depreciation Amortization Impairment [Line Items]      
Percentage of medicare payment (in hundredths) 0.00%usph_PercentageOfMedicarePayment
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= usph_JanuaryFirstTwoThousandFifteenThroughMarchThirtyFirstTwoThousandFifteenMember		    
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		    
Annual limit occupational therapy services 1,940usph_AnnualLimitOccupationalTherapyServices
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Maximum [Member] | Effective Date One [Member]      
Depreciation Amortization Impairment [Line Items]      
Annual limit on physical therapy and speech language pathology services 1,920usph_AnnualLimitOnPhysicalTherapyAndSpeechLanguagePathologyServices
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_UnusualOrInfrequentItemAxis
= usph_EffectiveDateOneMember		    
Annual limit occupational therapy services $ 1,920usph_AnnualLimitOccupationalTherapyServices
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_UnusualOrInfrequentItemAxis
= usph_EffectiveDateOneMember		    
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