Existing Lease Terms and Renewal Options for Each of UHS Hospital Facilities (Parenthetical) (Detail) - Universal Health Services, Inc	12 Months Ended
Dec. 31, 2017 Time RenewalOption
Operating Leased Assets [Line Items]
Number of renewal options at existing lease rates	3
McAllen Medical Center
Operating Leased Assets [Line Items]
Number of renewal options at existing lease rates	2
Renewal options term at existing lease rates	5 years
Renewal options at existing lease rates expiration year	2031
Wellington Regional Medical Center And Southwest Healthcare System
Operating Leased Assets [Line Items]
Number of renewal options at fair market value lease rates \| RenewalOption	2
Renewal options term at fair market value lease rates	5 years
Wellington Regional Medical Center And Southwest Healthcare System \| Minimum
Operating Leased Assets [Line Items]
Renewal options at fair market value lease rates expiration year	2022
Wellington Regional Medical Center And Southwest Healthcare System \| Maximum
Operating Leased Assets [Line Items]
Renewal options at fair market value lease rates expiration year	2031

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Operating leases, renewal options term at existing lease rates.

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