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Notes Payable - Additional Information (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Installment
Dec. 31, 2013
Installment
Dec. 31, 2012
Installment
Dec. 05, 2013
Debt Instrument [Line Items]        
Revolving credit outstanding $ 35,617,000us-gaap_LongTermDebt $ 41,475,000us-gaap_LongTermDebt    
Number of annual installments 2usph_BusinessAcquisitionPurchasePriceAllocationNotesPayableNumberOfInstallment 2usph_BusinessAcquisitionPurchasePriceAllocationNotesPayableNumberOfInstallment    
Notes Payable, Other Payables [Member]        
Debt Instrument [Line Items]        
Aggregate amount of notes payable 500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
1,300,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
350,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
 
Aggregate principal installments 233,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
650,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
175,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
 
Average effective interest rate (in hundredths) 3.25%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
3.25%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
3.25%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
 
Number of annual installments 2usph_BusinessAcquisitionPurchasePriceAllocationNotesPayableNumberOfInstallment
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
2usph_BusinessAcquisitionPurchasePriceAllocationNotesPayableNumberOfInstallment
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
2usph_BusinessAcquisitionPurchasePriceAllocationNotesPayableNumberOfInstallment
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
 
Minimum [Member]        
Debt Instrument [Line Items]        
Spread on Libor variable rate (in hundredths) 1.50%usph_DebtInstrumentBasisSpreadOnLiborVariableRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Spread on base variable rate (in hundredths) 0.10%usph_DebtInstrumentBasisSpreadOnBaseVariableRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Percentage of unused commitment fee (in hundredths) 0.10%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Maximum [Member]        
Debt Instrument [Line Items]        
Spread on Libor variable rate (in hundredths) 2.50%usph_DebtInstrumentBasisSpreadOnLiborVariableRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Spread on base variable rate (in hundredths) 1.00%usph_DebtInstrumentBasisSpreadOnBaseVariableRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Percentage of unused commitment fee (in hundredths) 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Credit agreement average effective interest rate of 2.4% inclusive of unused fee [Member]        
Debt Instrument [Line Items]        
Revolving credit facility commitment       125,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Revolving credit facility maturity date       Nov. 30, 2018
Revolving credit outstanding 34,500,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
     
Remaining revolving credit outstanding $ 90,500,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember