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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
	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

Name:	us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration