Net Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets And Liabilities [Line Items]
Current deferred taxes, Assets	$ 115,870us-gaap_DeferredTaxAssetsNetCurrent	$ 121,097us-gaap_DeferredTaxAssetsNetCurrent
Current deferred taxes, Liabilities	(1,305)us-gaap_DeferredTaxLiabilitiesCurrent	(1,194)us-gaap_DeferredTaxLiabilitiesCurrent
Total deferred taxes-current	114,565	119,903
Noncurrent deferred taxes, Assets	85,792us-gaap_DeferredTaxAssetsNetNoncurrent	103,221us-gaap_DeferredTaxAssetsNetNoncurrent
Noncurrent deferred taxes, Liabilities	(368,006)uhs_DeferredTaxLiabilitiesNetNoncurrent	(342,369)uhs_DeferredTaxLiabilitiesNetNoncurrent
Total deferred taxes-noncurrent	(282,214)	(239,148)
Net deferred income tax liabilities	$ (167,649)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (119,245)us-gaap_DeferredTaxAssetsLiabilitiesNet

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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