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Relationship with Universal Health Realty Income Trust and Related Party Transactions - Additional Information (Detail) (USD $) | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  | 3 Months Ended |  | 3 Months Ended
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Sep. 30, 2014 Chief Executive Officer | Sep. 30, 2014 Chief Executive Officer Minimum | Sep. 30, 2014 Chief Executive Officer Trust Owned by Chief Executive Officer | Sep. 30, 2014 Relationship with Universal Health Realty Income Trust | Sep. 30, 2013 Relationship with Universal Health Realty Income Trust | Sep. 30, 2014 Relationship with Universal Health Realty Income Trust | Sep. 30, 2013 Relationship with Universal Health Realty Income Trust | Dec. 31, 2013 Relationship with Universal Health Realty Income Trust | Mar. 31, 2015 Relationship with Universal Health Realty Income Trust Scenario, Forecast Texas Facility | Sep. 30, 2014 Relationship with Universal Health Realty Income Trust Minimum | Mar. 31, 2015 Relationship with Universal Health Realty Income Trust Minimum Scenario, Forecast | Sep. 30, 2014 Relationship with Universal Health Realty Income Trust Maximum | Mar. 31, 2015 Relationship with Universal Health Realty Income Trust Maximum Scenario, Forecast
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Trust outstanding shares held, percentage |  |  |  | 6.10% |  | 6.10% |  |  |  |  |  |  |
Advisory fee earned |  |  |  | $ 700,000 | $ 600,000 | $ 1,900,000 | $ 1,800,000 |  |  |  |  |  |
Pre-tax share of income from the Trust |  |  |  | 1,700,000 | 86,000 | 2,100,000 | 599,000 |  |  |  |  |  |
Share of aggregate gain on fair value recognition included in the share of trust |  |  |  | 1,600,000 |  | 1,600,000 |  |  |  |  |  |  |
Non-controlling ownership interests by subsidiaries |  |  |  | 100.00% |  | 100.00% |  |  |  |  |  |  |
Carrying value of investment in Trust |  |  |  | 9,000,000 |  | 9,000,000 |  | 8,000,000 |  |  |  |  |
Market value of investment in Trust |  |  |  | 33,000,000 |  | 33,000,000 |  | 32,000,000 |  |  |  |  |
Rent expense under operating leases |  |  |  | 4,000,000 | 4,000,000 | 12,000,000 | 12,000,000 |  |  |  |  |  |
Estimated purchase price of The Bridgeway's real property |  |  |  |  |  |  |  |  |  | 17,000,000 |  | 17,500,000 |
Number of free-standing emergency departments to be acquired |  |  |  |  |  |  |  |  | 2 |  |  |  |
Aggregate construction cost/sales proceeds |  |  |  |  |  |  |  |  |  |  | 12,500,000 |  | 13,000,000
Aggregate rent expense paid |  |  |  |  |  |  |  |  |  |  | 850,000 |  | 900,000
Estimated payments to acquire life insurance policies | 25,000,000 |  | 8,000,000 |  |  |  |  |  |  |  |  |  |
Estimated death benefit proceeds |  | $ 33,000,000 |  |  |  |  |  |  |  |  |  |  |

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