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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, 2013	Mar. 31, 2012
Basic and Diluted:
Net income attributable to UHS	$ 119,784	$ 128,607
Less: Net income attributable to unvested restricted share grants	(69)	(168)
Net income attributable to UHS - basic and diluted	$ 119,715	$ 128,439
Weighted average number of common shares-basic	97,711	96,593
Net effect of dilutive stock options and grants based on the treasury stock method	860	1,198
Weighted average number of common shares and equivalents-diluted	98,571	97,791
Earnings per basic share attributable to UHS:	$ 1.23	$ 1.33
Earnings per diluted share attributable to UHS:	$ 1.21	$ 1.31

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