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Acquisitions and Divestitures - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended
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Dec. 28, 2016 USD ($) Facility | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 Facility | Sep. 30, 2016 Bed | Dec. 31, 2018 USD ($) Facility Bed | Dec. 31, 2017 USD ($) Bed | Dec. 31, 2016 USD ($) $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill recognition description |  |  |  |  |  |  |  |  |  |  |  | Goodwill of the facilities acquired during each of the last 3 years is computed, pursuant to the residual method, by deducting the fair value of the acquired assets and liabilities from the total purchase price. The factors that contribute to the recognition of goodwill, which may also influence the purchase price, include the following for each of the acquired facilities: (i) the historical cash flows and income levels; (ii) the reputations in their respective markets; (iii) the nature of the respective operations, and; (iv) the future cash flows and income growth projections. |  |
Aggregate cash proceeds from divestiture of businesses |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0
Net revenues |  | $ 2,754,496,000 | $ 2,648,913,000 | $ 2,681,353,000 | $ 2,687,516,000 | $ 2,642,787,000 | $ 2,541,864,000 | $ 2,612,356,000 | $ 2,612,858,000 |  |  | $ 10,772,278,000 | $ 10,409,865,000 | 9,766,210,000
The Limes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds | Bed |  |  |  |  |  |  |  |  |  |  |  |  | 18 |
Net revenues from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |
Income before income taxes from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  | 953,000 |
After-tax income from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  | 770,000 |
2018 Acquisitions of Assets and Businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition, cash paid |  |  |  |  |  |  |  |  |  |  |  | $ 110,000,000 |  |
Danshell Group [Member] | Located in U.K. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of behavioral health care facilities | Facility |  |  |  |  |  |  |  |  |  |  |  | 25 |  |
Gulfport Behavioral Health System | Located in Gulfport |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds | Bed |  |  |  |  |  |  |  |  |  |  |  | 109 |  |
2017 Acquisitions of Assets and Businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition, cash paid |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,000,000 |
2016 Acquisitions of Assets and Businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition, cash paid |  |  |  |  |  |  |  |  |  |  |  |  |  | 614,000,000
Unaudited pro forma net revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,980,000,000
Unaudited pro forma net income attributable to UHS |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 730,000,000
Unaudited pro forma net income attributable to UHS per diluted share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.25
Cambian Adult Services |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price of acquisition | $ 473,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cambian Adult Services | Located in U.K. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of behavioral health care facilities | Facility | 79 |  |  |  |  |  |  |  |  | 79 |  |  |  |
Number of outpatient centers | Facility | 2 |  |  |  |  |  |  |  |  | 2 |  |  |  |
Desert View Hospital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000,000
Desert View Hospital | Located in Pahrump, Nevada |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds | Bed |  |  |  |  |  |  |  |  |  |  | 25 |  |  |

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