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Acquisitions of Businesses and Non-Controlling Interests - Schedule of Multi Clinic Acquisition (Details) | 12 Months Ended |  |  |
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Dec. 31, 2014 Clinic | Dec. 31, 2013 Clinic | Dec. 31, 2012 Clinic | Dec. 13, 2013 | Dec. 09, 2013 | May 22, 2012
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of interest acquired (in hundredths) |  |  |  | 90.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired | 60.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired | 70.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
April 2014 Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date | Apr. 30, 2014 |  |  |  |  |
Percentage of interest acquired (in hundredths) | 70.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = usph_AprilTwoThousandFourteenAcquisitionMember |  |  |  |  |
Number of Clinics | 13 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = usph_AprilTwoThousandFourteenAcquisitionMember |  |  |  |  |
August 2014 Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date | Aug. 01, 2014 |  |  |  |  |
Percentage of interest acquired (in hundredths) | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = usph_AugustTwoThousandFourteenAcqusitionMember |  |  |  |  |
Number of Clinics | 3 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = usph_AugustTwoThousandFourteenAcqusitionMember |  |  |  |  |
February 2013 Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date | Feb. 28, 2013 | Feb. 28, 2013 |  |  |  |
Percentage of interest acquired (in hundredths) | 72.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = usph_FebruaryTwoThousandThirteenAcquisitionMember | 72.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = usph_FebruaryTwoThousandThirteenAcquisitionMember |  |  |  |
Number of Clinics | 9 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = usph_FebruaryTwoThousandThirteenAcquisitionMember | 9 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = usph_FebruaryTwoThousandThirteenAcquisitionMember |  |  |  |
April 2013 Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date | Apr. 30, 2013 | Apr. 30, 2013 |  |  |  |
Percentage of interest acquired (in hundredths) | 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = usph_AprilTwoThousandThirteenAcquisitionMember | 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = usph_AprilTwoThousandThirteenAcquisitionMember |  |  |  |
Number of Clinics | 5 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = usph_AprilTwoThousandThirteenAcquisitionMember | 5 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = usph_AprilTwoThousandThirteenAcquisitionMember |  |  |  |
May 2013 Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date | May 24, 2013 | May 24, 2013 |  |  |  |
Percentage of interest acquired (in hundredths) | 80.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = usph_MayTwoThousandThirteenAcquisitionMember | 80.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = usph_MayTwoThousandThirteenAcquisitionMember |  |  |  |
Number of Clinics | 5 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = usph_MayTwoThousandThirteenAcquisitionMember | 5 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = usph_MayTwoThousandThirteenAcquisitionMember |  |  |  |
December 9, 2013 Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date | Dec. 09, 2013 | Dec. 09, 2013 |  |  |  |
Percentage of interest acquired (in hundredths) | 60.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = usph_DecemberNineTwoThousandThirteenAcquisitionMember | 60.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = usph_DecemberNineTwoThousandThirteenAcquisitionMember |  |  |  |
Number of Clinics | 12 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = usph_DecemberNineTwoThousandThirteenAcquisitionMember | 12 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = usph_DecemberNineTwoThousandThirteenAcquisitionMember |  |  |  |
December 13, 2013 Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date | Dec. 13, 2013 | Dec. 13, 2013 |  |  |  |
Percentage of interest acquired (in hundredths) | 90.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = usph_DecemberThirteenTwoThousandThirteenAcquisitionMember | 90.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = usph_DecemberThirteenTwoThousandThirteenAcquisitionMember |  |  |  |
Number of Clinics | 11 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = usph_DecemberThirteenTwoThousandThirteenAcquisitionMember | 11 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = usph_DecemberThirteenTwoThousandThirteenAcquisitionMember |  |  |  |
May 2012 Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date |  |  | May 22, 2012 |  |  |
Percentage of interest acquired (in hundredths) |  |  | 70.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = usph_MayTwoThousandTwelveAcquisitionMember |  |  |
Number of Clinics |  |  | 7 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = usph_MayTwoThousandTwelveAcquisitionMember |  |  |

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