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Relationship with Universal Health Realty Income Trust and Related Party Transactions - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Chief Executive Officer |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Estimated payments to acquire life insurance policies |  |  | $ 25,000,000 |  |
Chief Executive Officer | Minimum |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Estimated death benefit proceeds |  |  | 33,000,000 |  |
Chief Executive Officer | Trust Owned by Chief Executive Officer |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Estimated payments to acquire life insurance policies |  |  | 8,000,000 |  |
Relationship with Universal Health Realty Income Trust |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Trust outstanding shares held, percentage | 6.10% |  | 6.10% |  |
Advisory fee earned | 600,000 | 600,000 | 1,200,000 | 1,200,000 |
Pre-tax share of income from the Trust | 100,000 | 200,000 | 400,000 | 500,000 |
Carrying value of investment in Trust | 8,000,000 |  | 8,000,000 |  | 8,000,000
Market value of investment in Trust | 34,000,000 |  | 34,000,000 |  | 32,000,000
Rent expense under operating leases | $ 4,000,000 | $ 4,000,000 | $ 8,000,000 | $ 8,000,000 |
Non-controlling ownership interests by subsidiaries | 100.00% |  | 100.00% |  |

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