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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Basic and Diluted:
Net Income (Loss)	$ 353,218	$ 289,152	$ 669,898	$ 550,986
Less: Net income attributable to unvested restricted share grants		(5)		(50)
Net income attributable to UHS - basic	353,218	289,147	669,898	550,936
Net income attributable to UHS - diluted	$ 353,218	$ 289,147	$ 669,898	$ 550,936
Weighted average number of common shares - basic	64,356	66,878	64,663	67,041
Net effect of dilutive stock options and grants based on the treasury stock method	635	1,042	851	1,160
Weighted average number of common shares and equivalents - diluted	64,991	67,920	65,514	68,201
Earnings per basic share attributable to UHS:	$ 5.49	$ 4.32	$ 10.36	$ 8.22
Earnings per diluted share attributable to UHS:	$ 5.43	$ 4.26	$ 10.23	$ 8.08