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Computation of Basic and Diluted Earnings per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Basic and Diluted:
Net income attributable to UHS	$ 138,078	$ 119,784
Less: Net income attributable to unvested restricted share grants	(70)	(69)
Net income attributable to UHS - basic and diluted	$ 138,008	$ 119,715
Weighted average number of common shares - basic	98,572	97,711
Net effect of dilutive stock options and grants based on the treasury stock method	1,585	860
Weighted average number of common shares and equivalents - diluted	100,157	98,571
Earnings per basic share attributable to UHS	$ 1.40	$ 1.23
Earnings per diluted share attributable to UHS	$ 1.38	$ 1.21

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