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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Computation of earnings per share - USPH shareholders [Abstract]                      
Net income attributable to USPH shareholders                 $ 40,039 $ 34,873 $ 22,256
Charges to retained Earnings [Abstract]                      
Revaluation of redeemable non-controlling interest                 (11,893) (24,770) (201)
Tax effect at statutory rate (federal and state) of 26.25%                 3,121 6,502 75
Net income attributable to common shareholders                 $ 31,267 $ 16,605 $ 22,130
Earnings per share (basic and diluted) (in dollars per share) $ 0.55 $ 0.66 $ 0.85 $ 0.39 $ 0.43 $ 0.13 $ 0.48 $ 0.27 $ 2.45 $ 1.31 $ 1.76
Shares used in computation [Abstract]                      
Basic and diluted earnings per share - weighted-average shares (in shares) 12,774 12,774 12,767 12,707 12,685 12,685 12,677 12,616 12,756 12,666 12,570
Federal and state statutory income tax rate                 26.25%