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Schedule of Weighted Average Remaining Contractual Life for Options Outstanding and Weighted Average Exercise Price Per Share for Exercisable Options (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Weighted average forfeiture rate | 9.64%

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- Definition Share based compensation arrangement by share based payment award options forfeitures in period weighted average forfeiture rate. + References No definition available. + Details
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Namespace Prefix: | uhs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration