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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, 2015	Mar. 31, 2014
Basic and Diluted:
Net income attributable to UHS	$ 174,299us-gaap_NetIncomeLoss	$ 138,078us-gaap_NetIncomeLoss
Less: Net income attributable to unvested restricted share grants	(68)uhs_NetIncomeAllocatedToUnvestedRestrictedShares	(70)uhs_NetIncomeAllocatedToUnvestedRestrictedShares
Net income attributable to UHS - basic and diluted	$ 174,231uhs_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted	$ 138,008uhs_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted
Weighted average number of common shares-basic	98,910us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	98,572us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net effect of dilutive stock options and grants based on the treasury stock method	1,737us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	1,585us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average number of common shares and equivalents-diluted	100,647us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	100,157us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per basic share attributable to UHS	$ 1.76us-gaap_EarningsPerShareBasic	$ 1.40us-gaap_EarningsPerShareBasic
Earnings per diluted share attributable to UHS	$ 1.73us-gaap_EarningsPerShareDiluted	$ 1.38us-gaap_EarningsPerShareDiluted

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