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Intangible Assets, Net - Additional Information (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Tradenames [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life 6 years  
Accumulated amortization $ 86,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
$ 0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Referral relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Accumulated amortization 2,610,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= usph_ReferralRelationshipMember
1,582,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= usph_ReferralRelationshipMember
Referral relationships [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life 6 years  
Referral relationships [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life 16 years  
Referral relationships [Member] | Physician Services Business [Member]    
Finite-Lived Intangible Assets [Line Items]    
Accumulated amortization   156,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= usph_ReferralRelationshipMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= usph_PhysicianServicesMember
Non competition agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Accumulated amortization 2,377,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
1,950,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Non competition agreements [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life 5 years  
Non competition agreements [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life 6 years  
Non competition agreements [Member] | Physician Services Business [Member]    
Finite-Lived Intangible Assets [Line Items]    
Accumulated amortization   $ 270,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= usph_PhysicianServicesMember