Name:	us-gaap_BusinessAcquisitionLineItems
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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
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Data Type:	num:percentItemType
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Period Type:	instant

Represents the purchase by the parent of an additional equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The purchase of the additional equity interest represented by this element increases the parent's controlling interest in the subsidiary.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4M
-URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591554-111686

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Name:	us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

Name:	us-gaap_ProceedsFromMinorityShareholders
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of unrecognized tax benefits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

Name:	us-gaap_UnrecognizedTaxBenefits
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Refers to business acquisition cost of acquired entity charge from additional paid up capital.

No definition available.

Name:	usph_BusinessAcquisitionCostOfAcquiredEntityChargeFromAdditionalPaidUpCapital
Namespace Prefix:	usph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of business acquisition principal installments payable at cost of acquired by entity at accrued interest.

No definition available.

Name:	usph_BusinessAcquisitionPrincipalInstallmentsPayableAtCostOfAcquiredByEntityAtAccruedInterest
Namespace Prefix:	usph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

This element represents the business acquisition purchase price allocation net book value.

No definition available.

Name:	usph_BusinessAcquisitionPurchasePriceAllocationNetBookValue
Namespace Prefix:	usph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Business acquisition purchase price allocation notes payable number of equal installment.

No definition available.

Name:	usph_BusinessAcquisitionPurchasePriceAllocationNotesPayableNumberOfInstallment
Namespace Prefix:	usph_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The amount of business acquisition cost of acquired entity debt issued on the date of acquisition.

No definition available.

Name:	usph_BusinessCombinationCostOfAcquiredEntityDebtIssued
Namespace Prefix:	usph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Refers to noncontrolling interest sold in a noncash (or part noncash) transaction. "Part noncash" refers to that portion notes receivable.

No definition available.

Name:	usph_NoncashOrPartNoncashSaleOfNoncontrollingInterestByIssuingNotesReceivable
Namespace Prefix:	usph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Refers to number of partnership interest sold by parent.

No definition available.

Name:	usph_NumberOfPartnershipInInterestSoldByParent
Namespace Prefix:	usph_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Number of partnership in which interest acquired during the period.

No definition available.

Name:	usph_NumberOfPartnershipInWhichInterestAcquired
Namespace Prefix:	usph_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Refers to amount of non-controlling interest sold by an entity during the period, the sales prices included aggregate cash plus notes receivable of which payments due monthly based on percentages of distributions and bonuses earned by the purchasers.

No definition available.

Name:	usph_SaleOfNonControllingInterestIncludingCashAndNotesReceivable
Namespace Prefix:	usph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Refers to noncontrolling percentage sold by an entity during the period.

No definition available.

Name:	usph_SaleOfNoncontrollingInterestPercentageInPartnershipOne
Namespace Prefix:	usph_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Refers to noncontrolling interest sold by an entity during the period.

No definition available.

Name:	usph_SaleOfNoncontrollingInterestPercentageInPartnershipTwo
Namespace Prefix:	usph_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Refers to amount of tax effected on noncontrolling interest sale price during the period.

No definition available.

Name:	usph_TaxEffectOnSaleOfNoncontrollingInterest
Namespace Prefix:	usph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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Name:	us-gaap_StatementScenarioAxis=usph_FebruaryTwoThousandEighteenMember
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Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
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