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NOTES PAYABLE AND CREDIT AGREEMENT - Summary of Credit Agreement and Notes Payable (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Payments/Long term debt, Total $ 42,915us-gaap_LongTermDebt $ 35,617us-gaap_LongTermDebt
Less current portion (932)us-gaap_LongTermDebtCurrent (883)us-gaap_LongTermDebtCurrent
Long term portion 41,983us-gaap_LongTermDebtNoncurrent 34,734us-gaap_LongTermDebtNoncurrent
Credit Facility [Member]    
Debt Instrument [Line Items]    
Payments/Long term debt, Total 41,500us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= usph_CreditFacilityMember
34,500us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= usph_CreditFacilityMember
Average effective interest rate (in hundredths) 2.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_DebtInstrumentAxis
= usph_CreditFacilityMember
 
3.25 % notes payable due in next year [Member]    
Debt Instrument [Line Items]    
Payments/Long term debt, Total 1,415us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= usph_PromissoryNotesMember
1,117us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= usph_PromissoryNotesMember
Annual installments $ 932us-gaap_DebtInstrumentAnnualPrincipalPayment
/ us-gaap_DebtInstrumentAxis
= usph_PromissoryNotesMember
 
Percentage of interest accrued (in hundredths) 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= usph_PromissoryNotesMember