Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Basic and Diluted:
Net income attributable to UHS	$ 153,913	$ 209,091
Less: Net income attributable to unvested restricted share grants	(249)	(552)
Net income attributable to UHS – basic and diluted	$ 153,664	$ 208,539
Weighted average number of common shares - basic	75,030	84,782
Net effect of dilutive stock options and grants based on the treasury stock method	1,011	1,014
Weighted average number of common shares and equivalents - diluted	76,041	85,796
Earnings per basic share attributable to UHS:	$ 2.05	$ 2.46
Earnings per diluted share attributable to UHS:	$ 2.02	$ 2.43