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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]                      
Net income attributable to USPh shareholders                 $ 22,256 $ 20,551 $ 20,615
Charges to additional paid-in capital Revaluation of redeemable non-controlling interests                 (206) 0 0
Tax effect at statutory rate (federal and state) of 39.25%                 80 0 0
Net income attributable to common shareholders                 $ 22,130 $ 20,551 $ 20,615
Basic and diluted net income per share attributable to USPH shareholders (in dollars per share) $ 0.57 $ 0.41 $ 0.39 $ 0.38 $ 0.42 $ 0.38 $ 0.48 $ 0.36 $ 1.76 $ 1.64 $ 1.66
Shares used in computation [Abstract]                      
Basic and diluted earnings per share - weighted-average shares (in shares) 12,593 12,581 12,579 12,528 12,519 12,520 12,511 12,448 12,570 12,500 12,392
Federal and state statutory income tax rate                 39.25%