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Common Stock (Details) (USD $)
1 Months Ended 12 Months Ended
Mar. 31, 2009
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2008
Common Stock [Abstract]        
Common stock authorized by the Board of Directors (in shares) 1,200,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased     2,250,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Maximum percentage of repurchase of common stock (in hundredths) 10.00%usph_MaximumPercentageOfRepurchaseOfCommonStock      
Bank credit agreement to permit share repurchases of common stock $ 15,000,000usph_BankCreditAgreementToPermitShareRepurchasesOfCommonStock      
Total purchased shares (in shares) 859,499us-gaap_StockRepurchasedDuringPeriodShares 0us-gaap_StockRepurchasedDuringPeriodShares 0us-gaap_StockRepurchasedDuringPeriodShares  
Additional estimated shares (in shares) 340,501usph_AdditionalEstimatedRepurchaseOfCommonStock