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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Computation of earnings per share - USPH shareholders [Abstract]      
Net income attributable to USPH shareholders $ 40,831 $ 35,194 $ 40,039
(Charges) credit to retained earnings [Abstract]      
Revaluation of redeemable non-controlling interest (13,011) (4,632) (11,893)
Tax effect at statutory rate (federal and state) of 25.55% and 26.25%, respectively 3,324 1,216 3,121
Net income attributable to common shareholders $ 31,144 $ 31,778 $ 31,267
Earnings per share basic (in dollars per share) $ 2.41 $ 2.48 $ 2.45
Earnings per share diluted (in dollars per share) $ 2.41 $ 2.48 $ 2.45
Shares used in computation [Abstract]      
Basic earnings per share - weighted-average shares (in shares) 12,898 12,835 12,756
Diluted earnings per share - weighted-average shares (in shares) 12,898 12,835 12,756
Federal and state statutory income tax rate 25.55% 26.25%