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Relationship With Universal Health Realty Income Trust And Related Party Transactions (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | May 19, 2011 years | Sep. 30, 2011 Universal Health Realty Income Trust [Member] | Sep. 30, 2010 Universal Health Realty Income Trust [Member] | Sep. 30, 2011 Universal Health Realty Income Trust [Member] | Sep. 30, 2010 Universal Health Realty Income Trust [Member] | Dec. 31, 2010 Universal Health Realty Income Trust [Member]
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |
Trust outstanding shares held, percentage |  |  |  |  |  | 6.20% |  | 6.20% |  |
Advisory fee from the trust |  |  |  |  |  | $ 525,000 | $ 458,000 | $ 1,500,000 | $ 1,400,000 |
Pre-tax share of income from trust |  |  |  |  |  | 133,000 | 236,000 | 693,000 | 795,000 |
Carrying value of investment in trust |  |  |  |  |  | 5,800,000 |  | 5,800,000 |  | 7,300,000
Market value of investment in trust |  |  |  |  |  | 26,500,000 |  | 26,500,000 |  | 28,800,000
Lease and rental expense | $ 23,076,000 | $ 18,429,000 | $ 69,583,000 | $ 54,548,000 |  | $ 4,100,000 | $ 4,000,000 | $ 12,400,000 | $ 12,200,000 |
Lease renewal period, years |  |  |  |  | 5 |  |  |  |  |

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