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Relationship with Universal Health Realty Income Trust and Related Party Transactions - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) Hospital Facility | Mar. 31, 2017 USD ($) Hospital | Dec. 31, 2013 | Dec. 31, 2017 USD ($)
Chief Executive Officer |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Estimated payments to acquire life insurance policies | $ 28,000,000 |  |  |
Payments to acquire life insurance policies | 1,100,000 | $ 1,200,000 |  |
Chief Executive Officer | Trust Owned by CEO |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Estimated payments to acquire life insurance policies | 9,000,000 |  |  |
Minimum | Chief Executive Officer |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Estimated death benefit proceeds | $ 37,000,000 |  |  |
Relationship with Universal Health Realty Income Trust |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Trust outstanding shares held, percentage | 5.70% |  |  |
Advisory fee earned | $ 900,000 | 900,000 |  |
Pre-tax share of income from the Trust | 284,000 | 1,800,000 |  |
Carrying value of investment in Trust | 8,500,000 |  |  | $ 8,200,000
Market value of investment in Trust | $ 47,300,000 |  |  | 59,200,000
Lease renewal period, years | 5 years |  |  |
Rent expense under operating leases | $ 4,000,000 | $ 4,000,000 |  |
Notice period on renewal of lease | 90 days |  |  |
Period of rights of refusal to leased facilities | 180 days |  |  |
Number of hospital facilities | Hospital | 3 | 3 |  |
Number of free-standing emergency departments to be acquired | Facility | 2 |  |  |
Relationship with Universal Health Realty Income Trust | Minimum |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Lease initial terms | 13 years |  |  |
Non-controlling ownership interests by subsidiaries | 95.00% |  |  |
Relationship with Universal Health Realty Income Trust | Maximum |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Lease initial terms | 15 years |  |  |
Non-controlling ownership interests by subsidiaries | 100.00% |  |  |
Premier, Inc. | Group Purchasing Organization Agreement | Restricted Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Shares vesting period |  |  | 7 years |
Shares vesting period start year |  |  | 2014 |
Shares vesting period end year |  |  | 2020 |
Market value of retained vested shares | $ 35,000,000 |  |  | $ 33,000,000

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