Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net Income	$ 1,163,109	$ 719,307	$ 656,982
Less: Net (income) loss attributable to noncontrolling interest	(21,012)	(1,512)	18,627
Less: Net income attributable to unvested restricted share grants	(50)	(308)	(748)
Net income attributable to UHS-basic	1,142,047	717,487	674,861
Net income attributable to UHS-diluted	$ 1,142,047	$ 717,487	$ 674,861
Basic earnings per share attributable to UHS:
Weighted average number of common shares—basic	66,554	69,321	73,118
Total basic earnings per share	$ 17.16	$ 10.35	$ 9.23
Diluted earnings per share attributable to UHS:
Weighted average number of common shares—basic	66,554	69,321	73,118
Net effect of dilutive stock options and grants based on the treasury stock method	1,342	804	714
Weighted average number of common shares and equivalents—diluted	67,896	70,125	73,832
Total diluted earnings per share	$ 16.82	$ 10.23	$ 9.14