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Income Taxes - Additional Information (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Abstract] |  |  |
Deferred tax assets related to acquisitions of non controlling interests | $ 1,000,000 usph_DeferredTaxAssetsAcquisitionOfNoncontrollingInterest | $ 400,000 usph_DeferredTaxAssetsAcquisitionOfNoncontrollingInterest |
Tax receivable included in other current assets | 4,300,000 us-gaap_DeferredIncomeTaxesAndOtherTaxReceivableCurrent | 2,200,000 us-gaap_DeferredIncomeTaxesAndOtherTaxReceivableCurrent |
Increase in current state income tax provision | 223,000 usph_IncreaseInStateIncomeTaxProvision | 393,000 usph_IncreaseInStateIncomeTaxProvision |
Adjustment to state tax provision |  |  | 162,000 usph_AdjustmentToStateAndLocalTaxExpenseBenefit
Income Tax Examination [Line Items] |  |  |
Accrued interest and penalties associated with any unrecognized tax benefits | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Interest expense recognized | $ 0 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | $ 0 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | $ 0 us-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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- Definition Tax year being audited in the income tax examination, in CCYY format. + References No definition available. + Details
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- 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 + Details
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- 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 + Details
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- Definition Adjustment to state and local tax expense benefit during the period. + References No definition available. + Details
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- Definition Deferred tax assets related to acquisitions of non controlling interest. + References No definition available. + Details
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