Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Basic and Diluted:
Net Income (Loss)	$ 171,313	$ 164,062	$ 334,428	$ 317,975
Less: Net income attributable to unvested restricted share grants	(61)	(164)	(190)	(413)
Net income attributable to UHS – basic and diluted	$ 171,252	$ 163,898	$ 334,238	$ 317,562
Weighted average number of common shares - basic	70,073	73,682	70,304	74,356
Net effect of dilutive stock options and grants based on the treasury stock method	766	753	859	882
Weighted average number of common shares and equivalents - diluted	70,839	74,435	71,163	75,238
Earnings per basic share attributable to UHS:	$ 2.44	$ 2.22	$ 4.75	$ 4.27
Earnings per diluted share attributable to UHS:	$ 2.42	$ 2.20	$ 4.7	$ 4.22