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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings attributable to common shareholders [Abstract]                      
From continuing operations prior to revaluation of redeemable non-controlling interests, net of tax                 $ 20,853us-gaap_IncomeLossFromContinuingOperations $ 17,492us-gaap_IncomeLossFromContinuingOperations $ 18,212us-gaap_IncomeLossFromContinuingOperations
Charges to additional-paid-in-capital - revaluation of non-controlling interests, net of tax                 (1,086)usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarnings 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarnings 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarnings
From continuing operations, net of tax                 19,767usph_IncomeLossFromContinuingOperationsAfterRevaluationOfNonControllingInterests 17,492usph_IncomeLossFromContinuingOperationsAfterRevaluationOfNonControllingInterests 18,212usph_IncomeLossFromContinuingOperationsAfterRevaluationOfNonControllingInterests
From discontinued operations, net of tax                 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (4,769)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (279)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income attributable to common shareholders                 $ 19,767usph_IncomeLossFromOperationsAfterRevaluationOfNonControllingInterests $ 12,723usph_IncomeLossFromOperationsAfterRevaluationOfNonControllingInterests $ 17,933usph_IncomeLossFromOperationsAfterRevaluationOfNonControllingInterests
Basic earnings per share attributable to common shareholders [Abstract]                      
From continuing operations prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) $ 0.41usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerBasicShare $ 0.43usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerBasicShare $ 0.53usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerBasicShare $ 0.35usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerBasicShare $ 0.32usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerBasicShare $ 0.38usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerBasicShare $ 0.42usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerBasicShare $ 0.32usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerBasicShare $ 1.71usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerBasicShare $ 1.45usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerBasicShare $ 1.54usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerBasicShare
Charges to additional-paid-in-capital - revaluation of non-controlling interests, net of tax $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarningsPerShare $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarningsPerShare $ (0.01)usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarningsPerShare $ (0.08)usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarningsPerShare $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarningsPerShare $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarningsPerShare $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarningsPerShare $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarningsPerShare $ (0.09)usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarningsPerShare $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarningsPerShare $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxEarningsPerShare
From continuing operations, net of tax (in dollars per share) $ 0.41us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.43us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.52us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.27us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.32us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.38us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.42us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.32us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.62us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.45us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.54us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
From discontinued operations, net of tax (in dollars per share) $ 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ (0.36)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ (0.01)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ (0.01)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ (0.40)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare $ (0.02)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare
Basic (in dollars per share) $ 0.41us-gaap_EarningsPerShareBasic $ 0.43us-gaap_EarningsPerShareBasic $ 0.52us-gaap_EarningsPerShareBasic $ 0.27us-gaap_EarningsPerShareBasic $ 0.32us-gaap_EarningsPerShareBasic $ 0.02us-gaap_EarningsPerShareBasic $ 0.41us-gaap_EarningsPerShareBasic $ 0.31us-gaap_EarningsPerShareBasic $ 1.62us-gaap_EarningsPerShareBasic $ 1.05us-gaap_EarningsPerShareBasic $ 1.52us-gaap_EarningsPerShareBasic
Diluted earnings per share attributable to common shareholders [Abstract]                      
From continuing operations prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) $ 0.41usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerDilutedShare $ 0.43usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerDilutedShare $ 0.53usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerDilutedShare $ 0.35usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerDilutedShare $ 0.32usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerDilutedShare $ 0.38usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerDilutedShare $ 0.42usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerDilutedShare $ 0.32usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerDilutedShare $ 1.71usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerDilutedShare $ 1.45usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerDilutedShare $ 1.53usph_IncomeLossFromContinuingOperationsRedeemableNoncontrollingInterestPerDilutedShare
Charges to additional-paid-in-capital - revaluation of non-controlling interests, net of tax $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxDiluted $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxDiluted $ (0.01)usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxDiluted $ (0.08)usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxDiluted $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxDiluted $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxDiluted $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxDiluted $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxDiluted $ (0.09)usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxDiluted $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxDiluted $ 0usph_ChargesToAdditionalPaidInCapitalRevaluationOfNonControllingInterestsNetOfTaxDiluted
From continuing operations, net of tax (in dollars per share) $ 0.41us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.43us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.52us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.27us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.32us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.38us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.42us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.32us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.62us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.45us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.53us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
From discontinued operations, net of tax (in dollars per share) $ 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ (0.36)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ (0.01)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ (0.01)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ (0.40)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare $ (0.02)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare
Diluted (in dollars per share) $ 0.41us-gaap_EarningsPerShareDiluted $ 0.43us-gaap_EarningsPerShareDiluted $ 0.52us-gaap_EarningsPerShareDiluted $ 0.27us-gaap_EarningsPerShareDiluted $ 0.32us-gaap_EarningsPerShareDiluted $ 0.02us-gaap_EarningsPerShareDiluted $ 0.41us-gaap_EarningsPerShareDiluted $ 0.31us-gaap_EarningsPerShareDiluted $ 1.62us-gaap_EarningsPerShareDiluted $ 1.05us-gaap_EarningsPerShareDiluted $ 1.51us-gaap_EarningsPerShareDiluted
Shares used in computation [Abstract]                      
Basic earnings per share - weighted-average shares (in shares) 12,267us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,244us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,224us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,199us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,103us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,106us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,089us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,955us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,217us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,063us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,804us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities - Stock options (in shares)                 4us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 19us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 100us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Denominator for diluted earnings per share - adjusted weighted-average shares (in shares) 12,271us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,247us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,226us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,144us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,117us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,120us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,110us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,979us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,221us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,082us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,904us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding