BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Schedule of Clinic Acquisition (Details) - Clinic	9 Months Ended	12 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Number of clinics	2
June 2017 Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date	Jun. 30, 2017
Percentage of interest acquired	60.00%
Number of clinics	9
May 2017 Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date	May 31, 2017
Percentage of interest acquired	70.00%
Number of clinics	4
January 2017 Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date	Jan. 01, 2017
Percentage of interest acquired	70.00%
Number of clinics	17
February 2016 Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date		Feb. 29, 2016
Percentage of interest acquired		55.00%
Number of clinics		8
November 2016 Acquisition [Member]
Business Acquisition [Line Items]
Acquisition date		Nov. 30, 2016
Percentage of interest acquired		60.00%
Number of clinics		12

Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

No definition available.

Name:	us-gaap_BusinessAcquisitionDateOfAcquisitionAgreement1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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=79982066&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfBusinessesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=usph_JuneTwoThousandSeventeenAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=usph_MayTwoThousandSeventeenAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=usph_JanuaryTwoThousandSeventeenAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=usph_FebruaryTwoThousandSixteenAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=usph_NovemberTwoThousandSixteenAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: