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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Computation of earnings per share - USPH shareholders [Abstract]      
Net income attributable to USPH shareholders $ 35,194 $ 40,039 $ 34,873
Credit (Charges) To Retained Earnings [Abstract]      
Revaluation of redeemable non-controlling interest (4,632) (11,893) (24,770)
Tax effect at statutory rate (federal and state) of 26.25% 1,216 3,121 6,502
Net income attributable to common shareholders $ 31,778 $ 31,267 $ 16,605
Earnings per share (basic and diluted) (in dollars per share) $ 2.48 $ 2.45 $ 1.31
Shares used in computation [Abstract]      
Basic and diluted earnings per share - weighted-average shares (in shares) 12,835 12,756 12,666
Federal and state statutory income tax rate 26.25%