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Organization, Nature of Operations and Basis of Presentation - Additional Information (Details)
 12 Months Ended
Dec. 31, 2014
Facility
Clinic
State
Dec. 31, 2013
Clinic
Dec. 31, 2012
Clinic
Organization, Nature of Operations and Basis of Presentation [Abstract]      
Number of clinics operated 489usph_NumberOfClinicsOperated    
Number of states where clinics are operated 42us-gaap_NumberOfStatesInWhichEntityOperates    
Number of third party facilities 16usph_NumberOfThirdPartyFacilities    
Percentage of general partnership interest owned (in hundredths) 1.00%usph_PercentageOfGeneralPartnershipInterestOwned    
Percentage of limited partnership interest owned (in hundredths) 64.00%usph_PercentageOfLimitedPartnershipInterestOwned    
Number of clinic practices acquired 4usph_NumberOfClinicAcquired 3usph_NumberOfClinicAcquired 7usph_NumberOfClinicAcquired