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

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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