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Equity Based Plans - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-qualified options to purchase shares (in shares)	2,350,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Number of common shares available for grant (in shares)	496,903us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Shares outstanding for which restrictions had not lapsed (in shares)	279,833usph_ShareBasedCompensationArrangementByShareBasedPaymentAwardForSharesOutstandingRestrictionsHadNotLapsed
Restrictions will lapse in	2015 through 2018
Compensation expense	$ 0us-gaap_AllocatedShareBasedCompensationExpense	$ 0us-gaap_AllocatedShareBasedCompensationExpense
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price per share (in dollars per share)	$ 18.42us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Value per share ar closing price (in dollars per share)	$ 41.96us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Amount of options have intrinsic value	16,478us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Proceeds from exercise of stock options (in shares)	30,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Intrinsic value of shares exercised	600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	3,363,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	2,743,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	2,102,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Compensation not yet recognized	$ 6,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Amended 2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-qualified options to purchase shares (in shares)	1,750,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = usph_AmendedTwoThousandThreePlanMember
Number of common shares available for grant (in shares)	414,246us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = usph_AmendedTwoThousandThreePlanMember
Maximum [Member] | Non Qualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-qualified options to purchase shares (in shares)	600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = usph_NonQualifiedStockOptionsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Amended 2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares available for grant (in shares)	1,750,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = usph_AmendedTwoThousandThreePlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restrictions on the stock granted lapsed	5 years
Maximum [Member] | Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restrictions on the stock granted lapsed	4 years
Minimum [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restrictions on the stock granted lapsed	4 years
Minimum [Member] | Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restrictions on the stock granted lapsed	4 years

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

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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).

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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.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Number of share options (or share units) exercised during the current period.

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-Name Regulation S-X (SX)

-Number 210

-Section 04

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Number of shares outstanding for which restrictions had not lapsed.

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Description of restriction lapse grant to employees.

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