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Acquisitions and Divestitures - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 28, 2016 USD ($) Facility | Jan. 31, 2018 Bed | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Facility | Sep. 30, 2016 USD ($) Bed | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Facility Bed | Sep. 30, 2015 Hospital Bed | Mar. 31, 2015 Bed | Dec. 31, 2017 USD ($) Hospital Bed | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash proceeds from divestiture of businesses |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 3,000,000 |
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. |  |  |
Net revenues |  |  | $ 2,642,787,000 | $ 2,541,864,000 | $ 2,612,356,000 | $ 2,612,858,000 | $ 2,475,685,000 | $ 2,409,872,000 | $ 2,430,855,000 | $ 2,449,798,000 |  |  |  | $ 10,409,865,000 | 9,766,210,000 | 9,043,451,000 |
Number of hospital facilities | Hospital |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
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 |  |  |
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 | 9,280,000,000 |
Unaudited pro forma net income attributable to UHS |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 730,000,000 | $ 708,000,000 |
Unaudited pro forma net income attributable to UHS per diluted share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.25 | $ 7.03 |
Cambian Adult Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities | Facility | 79 |  |  |  |  |  | 79 |  |  |  |  |  |  |  |  |  |
Number of outpatient centers | Facility | 2 |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Total purchase price of acquisition | $ 473,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Desert View Hospital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds | Bed |  |  |  |  |  |  |  | 25 |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000,000 |  |
2015 Acquisitions of Assets and Businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition, cash paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 534,000,000 |
Net revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |
Unaudited pro forma net revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,170,000,000 | $ 8,350,000,000
Unaudited pro forma net income attributable to UHS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 690,000,000 | $ 545,000,000
Unaudited pro forma net income attributable to UHS per diluted share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.85 | $ 5.42
Behavioral Health Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds | Bed |  |  |  |  |  |  |  |  |  |  |  |  | 46 |  |  |  |
Alpha Hospitals Holdings Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds | Bed |  |  |  |  |  |  |  |  |  |  |  | 305 |  |  |  |  |
Number of hospital facilities | Hospital |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
Foundations Recovery Network, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds | Bed |  |  |  |  |  |  |  |  |  |  | 322 |  |  |  |  |  |
Number of facilities | Facility |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
Number of outpatient centers | Facility |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |
Indefinite lived Tradenames |  |  |  |  |  |  |  |  |  |  | $ 124,000,000 |  |  |  |  | $ 124,000,000 |
Subsequent Event | Gulfport Behavioral Health System |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds | Bed |  | 109 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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