Supplemental Condensed Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 35,078	$ 32,069	$ 16,261	$ 17,238
Accounts receivable, net	1,383,964us-gaap_AccountsReceivableNetCurrent	1,282,735us-gaap_AccountsReceivableNetCurrent
Supplies	108,269us-gaap_Supplies	108,115us-gaap_Supplies
Deferred income taxes	109,402	114,565
Other current assets	80,524us-gaap_OtherAssetsCurrent	77,654us-gaap_OtherAssetsCurrent
Total current assets	1,717,237us-gaap_AssetsCurrent	1,615,138us-gaap_AssetsCurrent
Investments in subsidiaries	0	0
Intercompany receivable	0us-gaap_DueFromAffiliateNoncurrent	0us-gaap_DueFromAffiliateNoncurrent
Intercompany note receivable	0	0
Property and equipment	6,301,410us-gaap_PropertyPlantAndEquipmentGross	6,212,030us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation	(2,610,630)	(2,532,341)
Property, Plant and Equipment, Net	3,690,780us-gaap_PropertyPlantAndEquipmentNet	3,679,689us-gaap_PropertyPlantAndEquipmentNet
Other assets:
Goodwill	3,297,436us-gaap_Goodwill	3,291,213us-gaap_Goodwill
Deferred charges	38,761us-gaap_DeferredOfferingCosts	40,319us-gaap_DeferredOfferingCosts
Other	340,141	348,084
Total assets	9,084,355us-gaap_Assets	8,974,443us-gaap_Assets	8,431,385us-gaap_Assets
Current liabilities:
Current maturities of long-term debt	89,023us-gaap_LongTermDebtCurrent	68,319us-gaap_LongTermDebtCurrent
Accounts payable and accrued liabilities	1,101,143	1,113,062
Federal and state taxes	65,106us-gaap_TaxesPayableCurrent	1,446us-gaap_TaxesPayableCurrent
Total current liabilities	1,255,272us-gaap_LiabilitiesCurrent	1,182,827us-gaap_LiabilitiesCurrent
Intercompany payable	0us-gaap_DueToAffiliateNoncurrent	0us-gaap_DueToAffiliateNoncurrent
Other noncurrent liabilities	277,617us-gaap_OtherLiabilitiesNoncurrent	268,555us-gaap_OtherLiabilitiesNoncurrent
Long-term debt	3,051,571us-gaap_LongTermDebtNoncurrent	3,210,215us-gaap_LongTermDebtNoncurrent
Intercompany note payable	0	0
Deferred income taxes	280,662	282,214
Redeemable noncontrolling interests	254,843	239,552
UHS common stockholders' equity	3,906,963us-gaap_StockholdersEquity	3,735,946us-gaap_StockholdersEquity
Noncontrolling interest	57,427us-gaap_MinorityInterest	55,134us-gaap_MinorityInterest
Total equity	3,964,390	3,791,080
Liabilities and Equity, Total	9,084,355	8,974,443
Consolidating Adjustments
Current assets:
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Supplies	0	0
Deferred income taxes	0	0
Other current assets	0	0
Total current assets	0	0
Investments in subsidiaries	(8,925,831)	(8,674,836)
Intercompany receivable	(466,935)	(512,490)
Intercompany note receivable	(1,222,637)	(1,222,637)
Property and equipment	0	0
Less: accumulated depreciation	0	0
Property, Plant and Equipment, Net	0	0
Other assets:
Goodwill	0	0
Deferred charges	0	0
Other	0	0
Total assets	(10,615,403)	(10,409,963)
Current liabilities:
Current maturities of long-term debt	0	0
Accounts payable and accrued liabilities	0	0
Federal and state taxes	0	0
Total current liabilities	0	0
Intercompany payable	(466,935)	(512,490)
Other noncurrent liabilities	0	0
Long-term debt	0	0
Intercompany note payable	(1,222,637)	(1,222,637)
Deferred income taxes	0	0
Redeemable noncontrolling interests	0	0
UHS common stockholders' equity	(8,925,831)	(8,674,836)
Noncontrolling interest	0	0
Total equity	(8,925,831)	(8,674,836)
Liabilities and Equity, Total	(10,615,403)	(10,409,963)
Parent
Current assets:
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Supplies	0	0
Deferred income taxes	108,654	113,822
Other current assets	0	0
Total current assets	108,654	113,822
Investments in subsidiaries	7,205,020	7,013,540
Intercompany receivable	14,763	103,808
Intercompany note receivable	0	0
Property and equipment	0	0
Less: accumulated depreciation	0	0
Property, Plant and Equipment, Net	0	0
Other assets:
Goodwill	0	0
Deferred charges	30,661	32,379
Other	9,028	9,601
Total assets	7,368,126	7,273,150
Current liabilities:
Current maturities of long-term debt	65,674	44,874
Accounts payable and accrued liabilities	17,230	20,245
Federal and state taxes	65,106	1,446
Total current liabilities	148,010	66,565
Intercompany payable	0	0
Other noncurrent liabilities	1,354	1,322
Long-term debt	3,031,137	3,187,103
Intercompany note payable	0	0
Deferred income taxes	280,662	282,214
Redeemable noncontrolling interests	0	0
UHS common stockholders' equity	3,906,963	3,735,946
Noncontrolling interest	0	0
Total equity	3,906,963	3,735,946
Liabilities and Equity, Total	7,368,126	7,273,150
Guarantors
Current assets:
Cash and cash equivalents	15,518	21,784	7,719	7,990
Accounts receivable, net	992,008	933,971
Supplies	67,246	67,847
Deferred income taxes	748	743
Other current assets	66,039	62,431
Total current assets	1,141,559	1,086,776
Investments in subsidiaries	1,720,811	1,661,296
Intercompany receivable	0	0
Intercompany note receivable	0	0
Property and equipment	4,544,670	4,494,567
Less: accumulated depreciation	(1,741,915)	(1,686,192)
Property, Plant and Equipment, Net	2,802,755	2,808,375
Other assets:
Goodwill	2,770,705	2,764,555
Deferred charges	5,463	5,402
Other	278,743	283,302
Total assets	8,720,036	8,609,706
Current liabilities:
Current maturities of long-term debt	1,215	1,260
Accounts payable and accrued liabilities	1,024,897	1,051,309
Federal and state taxes	0	0
Total current liabilities	1,026,112	1,052,569
Intercompany payable	466,935	512,490
Other noncurrent liabilities	193,215	189,456
Long-term debt	17,696	20,212
Intercompany note payable	1,222,637	1,222,637
Deferred income taxes	0	0
Redeemable noncontrolling interests	0	0
UHS common stockholders' equity	5,793,441	5,612,342
Noncontrolling interest	0	0
Total equity	5,793,441	5,612,342
Liabilities and Equity, Total	8,720,036	8,609,706
Non Guarantors
Current assets:
Cash and cash equivalents	19,560	10,285	8,542	9,248
Accounts receivable, net	391,956	348,764
Supplies	41,023	40,268
Deferred income taxes	0	0
Other current assets	14,485	15,223
Total current assets	467,024	414,540
Investments in subsidiaries	0	0
Intercompany receivable	452,172	408,682
Intercompany note receivable	1,222,637	1,222,637
Property and equipment	1,756,740	1,717,463
Less: accumulated depreciation	(868,715)	(846,149)
Property, Plant and Equipment, Net	888,025	871,314
Other assets:
Goodwill	526,731	526,658
Deferred charges	2,637	2,538
Other	52,370	55,181
Total assets	3,611,596	3,501,550
Current liabilities:
Current maturities of long-term debt	22,134	22,185
Accounts payable and accrued liabilities	59,016	41,508
Federal and state taxes	0	0
Total current liabilities	81,150	63,693
Intercompany payable	0	0
Other noncurrent liabilities	83,048	77,777
Long-term debt	2,738	2,900
Intercompany note payable	0	0
Deferred income taxes	0	0
Redeemable noncontrolling interests	254,843	239,552
UHS common stockholders' equity	3,132,390	3,062,494
Noncontrolling interest	57,427	55,134
Total equity	3,189,817	3,117,628
Liabilities and Equity, Total	$ 3,611,596	$ 3,501,550

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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The amount for notes payable (written promise to pay), payable to related parties, which are due after one year (or one business cycle).

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Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due after 1 year (or 1 business cycle).

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Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

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Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

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Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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Amount of consideration paid in advance for supplies that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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