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Relationship with Universal Health Realty Income Trust and Related Party Transactions - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Relationship with Universal Health Realty Income Trust |  |  |
Related Party Transaction [Line Items] |  |  |
Trust outstanding shares held, percentage | 6.20% |  |
Advisory fee earned | $ 571,000 | $ 515,000 |
Pre-tax share of income from the Trust | 300,000 | 300,000 |
Carrying value of investment in Trust | 8,800,000 |  | 9,300,000
Market value of investment in Trust | 45,400,000 |  | 39,900,000
Rent expense under operating leases | 4,100,000 | 4,100,000 |
Non-controlling ownership interests by subsidiaries | 100.00% |  |
Chief Executive Officer |  |  |
Related Party Transaction [Line Items] |  |  |
Estimated payments to acquire life insurance policies | 25,000,000 |  |
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 |  |

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