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Organization, Nature of Operations and Basis of Presentation - Additional Information (Details) | 12 Months Ended
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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 | 489 usph_NumberOfClinicsOperated |  |
Number of states where clinics are operated | 42 us-gaap_NumberOfStatesInWhichEntityOperates |  |
Number of third party facilities | 16 usph_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 | 4 usph_NumberOfClinicAcquired | 3 usph_NumberOfClinicAcquired | 7 usph_NumberOfClinicAcquired

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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of clinic acquired. + References No definition available. + Details
Name: | usph_NumberOfClinicAcquired
Namespace Prefix: | usph_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of clinics operated during the period. + References No definition available. + Details
Name: | usph_NumberOfClinicsOperated
Namespace Prefix: | usph_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of third party facilities. + References No definition available. + Details
Name: | usph_NumberOfThirdPartyFacilities
Namespace Prefix: | usph_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of general partnership interest owned during the period. + References No definition available. + Details
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Namespace Prefix: | usph_
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Balance Type: | na
Period Type: | duration

X
- Definition Percentage of limited partnership interest owned during the period. + References No definition available. + Details
Name: | usph_PercentageOfLimitedPartnershipInterestOwned
Namespace Prefix: | usph_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration