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NOTES PAYABLE AND CREDIT AGREEMENT - Additional Information (Details) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 05, 2013	Mar. 31, 2015 Installment	Dec. 31, 2014 Installment	Dec. 31, 2013
Debt Instrument [Line Items]
Maturity Date	Nov. 30, 2018
Revolving credit outstanding		$ 42,915,000us-gaap_LongTermDebt	$ 35,617,000us-gaap_LongTermDebt
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Remaining revolving credit outstanding				450,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_ShortTermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Aggregate amount of Notes Payable		500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember	466,172us-gaap_DebtInstrumentFaceAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Aggregate principal installments		250,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_ShortTermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember	233,086us-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
Business Acquisition Purchase Price Allocation Notes Payable Number Of Installment		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 Facility [Member]
Debt Instrument [Line Items]
Remaining revolving credit outstanding		83,500,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = usph_CreditFacilityMember
Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member]
Debt Instrument [Line Items]
Revolving credit facility commitment	125,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember

X

- Definition

Face (par) amount of debt instrument at time of issuance.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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- Definition

Amount of the required periodic payments applied to principal.

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- Definition

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Business acquisition purchase price allocation notes payable number of equal installment.

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