Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Basic and Diluted:
Net Income (Loss)	$ 372,957	$ 258,714	$ 1,042,855	$ 809,700
Less: Net income attributable to unvested restricted share grants				(50)
Net income attributable to UHS - basic	372,957	258,714	1,042,855	809,650
Net income attributable to UHS - diluted	$ 372,957	$ 258,714	$ 1,042,855	$ 809,650
Weighted average number of common shares - basic	62,974	66,537	64,100	66,873
Net effect of dilutive stock options and grants based on the treasury stock method	689	1,571	797	1,297
Weighted average number of common shares and equivalents - diluted	63,663	68,108	64,897	68,170
Earnings per basic share attributable to UHS:	$ 5.92	$ 3.89	$ 16.27	$ 12.11
Earnings per diluted share attributable to UHS:	$ 5.86	$ 3.80	$ 16.07	$ 11.88