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Schedule of Disaggregates Revenue by Major Source (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 2,822,453 | $ 2,648,913 | $ 8,482,012 | $ 8,017,782
Percentage of Net Revenue |  | 100.00% | 100.00% | 100.00% | 100.00%
Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 477,291 | $ 451,333 | $ 1,408,964 | $ 1,416,885
Percentage of Net Revenue |  | 17.00% | 17.00% | 17.00% | 18.00%
Managed Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 258,794 | $ 230,533 | $ 785,968 | $ 702,006
Percentage of Net Revenue |  | 9.00% | 9.00% | 9.00% | 9.00%
Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 317,441 | $ 296,591 | $ 917,112 | $ 872,710
Percentage of Net Revenue |  | 11.00% | 11.00% | 11.00% | 11.00%
Managed Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 412,794 | $ 365,529 | $ 1,235,020 | $ 1,130,528
Percentage of Net Revenue |  | 15.00% | 14.00% | 15.00% | 14.00%
Managed Care (HMO and PPOs) |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 878,481 | $ 834,273 | $ 2,709,628 | $ 2,600,190
Percentage of Net Revenue |  | 31.00% | 31.00% | 32.00% | 32.00%
UK Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 134,905 | $ 129,965 | $ 415,407 | $ 364,163
Percentage of Net Revenue |  | 5.00% | 5.00% | 5.00% | 5.00%
Other Patient Revenue and Adjustments,Net |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 176,882 | $ 188,212 | $ 515,307 | $ 469,460
Percentage of Net Revenue |  | 6.00% | 7.00% | 6.00% | 6.00%
Other Non-patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 165,865 | $ 152,477 | $ 494,606 | $ 461,840
Percentage of Net Revenue |  | 6.00% | 6.00% | 6.00% | 6.00%
Acute Care Hospital Services |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 1,528,535 | $ 1,383,050 | $ 4,575,088 | $ 4,232,673
Percentage of Net Revenue |  | 100.00% | 100.00% | 100.00% | 100.00%
Acute Care Hospital Services | Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 333,777 | $ 295,691 | $ 988,746 | $ 972,073
Percentage of Net Revenue |  | 22.00% | 21.00% | 22.00% | 23.00%
Acute Care Hospital Services | Managed Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 197,993 | $ 175,248 | $ 618,756 | $ 550,683
Percentage of Net Revenue |  | 13.00% | 13.00% | 14.00% | 13.00%
Acute Care Hospital Services | Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 148,570 | $ 126,977 | $ 391,762 | $ 349,794
Percentage of Net Revenue |  | 10.00% | 9.00% | 9.00% | 8.00%
Acute Care Hospital Services | Managed Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 133,906 | $ 123,296 | $ 413,607 | $ 410,243
Percentage of Net Revenue |  | 9.00% | 9.00% | 9.00% | 10.00%
Acute Care Hospital Services | Managed Care (HMO and PPOs) |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 554,341 | $ 500,688 | $ 1,690,889 | $ 1,547,496
Percentage of Net Revenue |  | 36.00% | 36.00% | 37.00% | 37.00%
Acute Care Hospital Services | UK Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 0 | $ 0 | $ 0 | $ 0
Percentage of Net Revenue |  | 0.00% | 0.00% | 0.00% | 0.00%
Acute Care Hospital Services | Other Patient Revenue and Adjustments,Net |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 45,918 | $ 62,055 | $ 133,962 | $ 104,926
Percentage of Net Revenue |  | 3.00% | 4.00% | 3.00% | 2.00%
Acute Care Hospital Services | Other Non-patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 114,030 | $ 99,095 | $ 337,366 | $ 297,458
Percentage of Net Revenue |  | 7.00% | 7.00% | 7.00% | 7.00%
Behavioral Health Services |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues | [1] | $ 1,291,816 | $ 1,262,472 | $ 3,898,440 | $ 3,774,551
Percentage of Net Revenue |  | 100.00% | 100.00% | 100.00% | 100.00%
Behavioral Health Services | Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 143,514 | $ 155,642 | $ 420,218 | $ 444,812
Percentage of Net Revenue |  | 11.00% | 12.00% | 11.00% | 12.00%
Behavioral Health Services | Managed Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 60,801 | $ 55,285 | $ 167,212 | $ 151,323
Percentage of Net Revenue |  | 5.00% | 4.00% | 4.00% | 4.00%
Behavioral Health Services | Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 168,871 | $ 169,614 | $ 525,350 | $ 522,916
Percentage of Net Revenue |  | 13.00% | 13.00% | 13.00% | 14.00%
Behavioral Health Services | Managed Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 278,888 | $ 242,233 | $ 821,413 | $ 720,285
Percentage of Net Revenue |  | 22.00% | 19.00% | 21.00% | 19.00%
Behavioral Health Services | Managed Care (HMO and PPOs) |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 324,140 | $ 333,585 | $ 1,018,739 | $ 1,052,694
Percentage of Net Revenue |  | 25.00% | 26.00% | 26.00% | 28.00%
Behavioral Health Services | UK Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 134,905 | $ 129,965 | $ 415,407 | $ 364,163
Percentage of Net Revenue |  | 10.00% | 10.00% | 11.00% | 10.00%
Behavioral Health Services | Other Patient Revenue and Adjustments,Net |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 130,964 | $ 126,157 | $ 381,345 | $ 364,534
Percentage of Net Revenue |  | 10.00% | 10.00% | 10.00% | 10.00%
Behavioral Health Services | Other Non-patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 49,733 | $ 49,991 | $ 148,756 | $ 153,824
Percentage of Net Revenue |  | 4.00% | 4.00% | 4.00% | 4.00%
Other |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 2,102 | $ 3,391 | $ 8,484 | $ 10,558
Other | Other Non-patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 2,102 | $ 3,391 | $ 8,484 | $ 10,558
[1] | Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $135 million and $130 million for the three-month periods ended September 30, 2019 and 2018, respectively, and approximately $415 million and $364 million for the nine-month periods ended September 30, 2019 and 2018, respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.175 billion and $1.231 billion as of September 30, 2019 and 2018, respectively.

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