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Equity Based Plans - Summary of Cumulative Summary of Equity Plans (Details)	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized (in shares)	2,350,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Restricted Stock Issued (in shares)	935,006usph_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockGrantsForTheCumulativePeriod
Outstanding stock options (in shares)	700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Stock Options Exercised (in shares)	917,391usph_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesForTheCumulativePeriod
Stock Options Exercisable (in shares)	700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Shares Available for Grant (in shares)	496,903us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Amended 1999 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized (in shares)	600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = usph_AmendedNineteenNinetyNinePlanMember
Restricted Stock Issued (in shares)	377,552usph_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockGrantsForTheCumulativePeriod / us-gaap_PlanNameAxis = usph_AmendedNineteenNinetyNinePlanMember
Outstanding stock options (in shares)	700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = usph_AmendedNineteenNinetyNinePlanMember
Stock Options Exercised (in shares)	139,091usph_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesForTheCumulativePeriod / us-gaap_PlanNameAxis = usph_AmendedNineteenNinetyNinePlanMember
Stock Options Exercisable (in shares)	700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = usph_AmendedNineteenNinetyNinePlanMember
Shares Available for Grant (in shares)	82,657us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = usph_AmendedNineteenNinetyNinePlanMember
Amended 2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized (in shares)	1,750,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = usph_AmendedTwoThousandThreePlanMember
Restricted Stock Issued (in shares)	557,454usph_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockGrantsForTheCumulativePeriod / us-gaap_PlanNameAxis = usph_AmendedTwoThousandThreePlanMember
Outstanding stock options (in shares)	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = usph_AmendedTwoThousandThreePlanMember
Stock Options Exercised (in shares)	778,300usph_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesForTheCumulativePeriod / us-gaap_PlanNameAxis = usph_AmendedTwoThousandThreePlanMember
Stock Options Exercisable (in shares)	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = usph_AmendedTwoThousandThreePlanMember
Shares Available for Grant (in shares)	414,246us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = usph_AmendedTwoThousandThreePlanMember

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of share options (or share units) exercised for the cumulative period.

+ References

No definition available.

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The number of grants made for the cumulative period on restricted stock units plan.

+ References

No definition available.

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