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ACQUISITIONS OF NON-CONTROLLING INTERESTS (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 Partnership | Dec. 31, 2014 Partnership
Business Acquisition [Line Items] |  |  |
Number of separate transactions to purchase partnership interest |  | 4 usph_NumberOfSeparateTransactionsToPurchasePartnershipInterest | 4 usph_NumberOfSeparateTransactionsToPurchasePartnershipInterest
Number of partnership in which interest acquired |  | 2 usph_NumberOfPartnershipInWhichInterestAcquired |
Purchase price for additional non controlling interest | $ 400,000 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent | $ 4,900,000 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent | $ 600,000 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent
Book value of purchase price | 20,000 usph_BusinessAcquisitionPurchasePriceAllocationNetBookValue | 3,000,000 usph_BusinessAcquisitionPurchasePriceAllocationNetBookValue | 100,000 usph_BusinessAcquisitionPurchasePriceAllocationNetBookValue
Remaining purchase price | 300,000 usph_BusinessAcquisitionCostOfAcquiredEntityChargeFromAdditionalPaidUpCapital | 1,900,000 usph_BusinessAcquisitionCostOfAcquiredEntityChargeFromAdditionalPaidUpCapital | 500,000 usph_BusinessAcquisitionCostOfAcquiredEntityChargeFromAdditionalPaidUpCapital
Future tax benefits | $ 100,000 us-gaap_UnrecognizedTaxBenefits | $ 800,000 us-gaap_UnrecognizedTaxBenefits | $ 200,000 us-gaap_UnrecognizedTaxBenefits
Minimum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of interest acquired (in hundredths) | 10.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_RangeAxis = us-gaap_MinimumMember | 10.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_RangeAxis = us-gaap_MinimumMember | 1.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of interest acquired (in hundredths) | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_RangeAxis = us-gaap_MaximumMember | 35.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_RangeAxis = us-gaap_MaximumMember | 35.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Represents the purchase by the parent of an additional equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The purchase of the additional equity interest represented by this element increases the parent's controlling interest in the subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591554-111686 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Refers to business acquisition cost of acquired entity charge from additional paid up capital. + References No definition available. + Details
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- Definition This element represents the business acquisition purchase price allocation net book value. + References No definition available. + Details
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- Definition Number of partnership in which interest acquired during the period. + References No definition available. + Details
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- Definition Number of separate transactions to purchase partnership interest during the period. + References No definition available. + Details
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