Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Basic and Diluted:
Net Income (Loss)	$ 316,680	$ 261,834
Less: Net income attributable to unvested restricted share grants		(45)
Net income attributable to UHS - basic	316,680	261,789
Net income attributable to UHS - diluted	$ 316,680	$ 261,789
Weighted average number of common shares - basic	64,970	67,204
Net effect of dilutive stock options and grants based on the treasury stock method	1,067	1,278
Weighted average number of common shares and equivalents - diluted	66,037	68,482
Earnings per basic share attributable to UHS:	$ 4.87	$ 3.90
Earnings per diluted share attributable to UHS:	$ 4.80	$ 3.82