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Income Taxes - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Deferred tax assets related to acquisitions of non controlling interests	$ 1,000,000usph_DeferredTaxAssetsAcquisitionOfNoncontrollingInterest	$ 400,000usph_DeferredTaxAssetsAcquisitionOfNoncontrollingInterest
Tax receivable included in other current assets	4,300,000us-gaap_DeferredIncomeTaxesAndOtherTaxReceivableCurrent	2,200,000us-gaap_DeferredIncomeTaxesAndOtherTaxReceivableCurrent
Increase in current state income tax provision	223,000usph_IncreaseInStateIncomeTaxProvision	393,000usph_IncreaseInStateIncomeTaxProvision
Adjustment to state tax provision			162,000usph_AdjustmentToStateAndLocalTaxExpenseBenefit
Income Tax Examination [Line Items]
Accrued interest and penalties associated with any unrecognized tax benefits	0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Interest expense recognized	$ 0us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	$ 0us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	$ 0us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Federal [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Periods open for examination	2013
Federal [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Periods open for examination	2011
State [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Periods open for examination	2013
State [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Periods open for examination	2010

X

- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and other tax receivables expected to be realized or consumed within one year or operating cycle, if longer.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Tax year being audited in the income tax examination, in CCYY format.

+ References

No definition available.

+ Details

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X

- Definition

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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X

- Definition

Amount of interest expense for an underpayment of income taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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- Definition

Adjustment to state and local tax expense benefit during the period.

+ References

No definition available.

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- Definition

Deferred tax assets related to acquisitions of non controlling interest.

+ References

No definition available.

+ Details

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X

- Definition

Increase in the state income tax provision during the period.

+ References

No definition available.

+ Details

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