Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income attributable to USPh shareholders									$ 34,873	$ 22,256	$ 20,551
Charges to additional paid-in capital, revaluation of redeemable non-controlling interests									(24,770)	(201)	0
Tax effect at statutory rate (federal and state) of 26.25%									6,502	75	0
Net income attributable to common shareholders									$ 16,605	$ 22,130	$ 20,551
Basic and diluted net income per share attributable to USPH shareholders (in dollars per share)	$ 0.43	$ 0.13	$ 0.48	$ 0.27	$ 0.57	$ 0.41	$ 0.39	$ 0.38	$ 1.31	$ 1.76	$ 1.64
Shares used in computation [Abstract]
Basic and diluted earnings per share - weighted-average shares (in shares)	12,685	12,685	12,677	12,616	12,593	12,581	12,579	12,528	12,666	12,570	12,500
Federal and state statutory income tax rate									26.25%