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Schedule of Disaggregates Revenue by Major Source (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 2,648,913 | $ 2,541,864 | $ 8,017,782 | $ 7,767,078
Percentage of Net Revenue |  | 100.00% | 100.00% | 100.00% | 100.00%
Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 451,333 | $ 457,466 | $ 1,416,885 | $ 1,377,561
Percentage of Net Revenue |  | 17.00% | 18.00% | 18.00% | 18.00%
Managed Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 230,533 | $ 202,870 | $ 702,006 | $ 593,436
Percentage of Net Revenue |  | 9.00% | 8.00% | 9.00% | 8.00%
Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 296,591 | $ 298,486 | $ 872,710 | $ 884,498
Percentage of Net Revenue |  | 11.00% | 12.00% | 11.00% | 11.00%
Managed Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 365,529 | $ 333,542 | $ 1,130,528 | $ 1,034,667
Percentage of Net Revenue |  | 14.00% | 13.00% | 14.00% | 13.00%
Managed Care (HMO and PPOs) |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 834,273 | $ 806,996 | $ 2,600,190 | $ 2,502,998
Percentage of Net Revenue |  | 31.00% | 32.00% | 32.00% | 32.00%
UK Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 129,965 | $ 110,526 | $ 364,163 | $ 316,938
Percentage of Net Revenue |  | 5.00% | 4.00% | 5.00% | 4.00%
Other Patient Revenue and Adjustments,Net |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 188,212 | $ 162,736 | $ 469,460 | $ 523,642
Percentage of Net Revenue |  | 7.00% | 6.00% | 6.00% | 7.00%
Other Non-patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 152,477 | $ 169,242 | $ 461,840 | $ 533,338
Percentage of Net Revenue |  | 6.00% | 7.00% | 6.00% | 7.00%
Acute Care Hospital Services |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 1,383,050 | $ 1,316,748 | $ 4,232,673 | $ 4,072,752
Percentage of Net Revenue |  | 100.00% | 100.00% | 100.00% | 100.00%
Acute Care Hospital Services | Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 295,691 | $ 299,844 | $ 972,073 | $ 925,857
Percentage of Net Revenue |  | 21.00% | 23.00% | 23.00% | 23.00%
Acute Care Hospital Services | Managed Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 175,248 | $ 160,548 | $ 550,683 | $ 471,727
Percentage of Net Revenue |  | 13.00% | 12.00% | 13.00% | 12.00%
Acute Care Hospital Services | Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 126,977 | $ 121,290 | $ 349,794 | $ 343,675
Percentage of Net Revenue |  | 9.00% | 9.00% | 8.00% | 8.00%
Acute Care Hospital Services | Managed Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 123,296 | $ 124,079 | $ 410,243 | $ 384,340
Percentage of Net Revenue |  | 9.00% | 9.00% | 10.00% | 9.00%
Acute Care Hospital Services | Managed Care (HMO and PPOs) |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 500,688 | $ 471,623 | $ 1,547,496 | $ 1,452,448
Percentage of Net Revenue |  | 36.00% | 36.00% | 37.00% | 36.00%
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 |  | $ 62,055 | $ 26,022 | $ 104,926 | $ 141,919
Percentage of Net Revenue |  | 4.00% | 2.00% | 2.00% | 3.00%
Acute Care Hospital Services | Other Non-patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 99,095 | $ 113,342 | $ 297,458 | $ 352,786
Percentage of Net Revenue |  | 7.00% | 9.00% | 7.00% | 9.00%
Behavioral Health Services |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues | [1] | $ 1,262,472 | $ 1,224,548 | $ 3,774,551 | $ 3,685,230
Percentage of Net Revenue |  | 100.00% | 100.00% | 100.00% | 100.00%
Behavioral Health Services | Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 155,642 | $ 157,622 | $ 444,812 | $ 451,704
Percentage of Net Revenue |  | 12.00% | 13.00% | 12.00% | 12.00%
Behavioral Health Services | Managed Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 55,285 | $ 42,322 | $ 151,323 | $ 121,709
Percentage of Net Revenue |  | 4.00% | 3.00% | 4.00% | 3.00%
Behavioral Health Services | Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 169,614 | $ 177,196 | $ 522,916 | $ 540,823
Percentage of Net Revenue |  | 13.00% | 14.00% | 14.00% | 15.00%
Behavioral Health Services | Managed Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 242,233 | $ 209,463 | $ 720,285 | $ 650,327
Percentage of Net Revenue |  | 19.00% | 17.00% | 19.00% | 18.00%
Behavioral Health Services | Managed Care (HMO and PPOs) |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 333,585 | $ 335,373 | $ 1,052,694 | $ 1,050,550
Percentage of Net Revenue |  | 26.00% | 27.00% | 28.00% | 29.00%
Behavioral Health Services | UK Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 129,965 | $ 110,526 | $ 364,163 | $ 316,938
Percentage of Net Revenue |  | 10.00% | 9.00% | 10.00% | 9.00%
Behavioral Health Services | Other Patient Revenue and Adjustments,Net |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 126,157 | $ 136,714 | $ 364,534 | $ 381,723
Percentage of Net Revenue |  | 10.00% | 11.00% | 10.00% | 10.00%
Behavioral Health Services | Other Non-patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 49,991 | $ 55,332 | $ 153,824 | $ 171,456
Percentage of Net Revenue |  | 4.00% | 5.00% | 4.00% | 5.00%
Other |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 3,391 | $ 568 | $ 10,558 | $ 9,096
Other | Other Non-patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 3,391 | $ 568 | $ 10,558 | $ 9,096
[1] | Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $130 million and $111 million for the three-month periods ended September 30, 2018 and 2017, respectively, and approximately $364 million and $317 million for the nine-month periods ended September 30, 2018 and 2017 respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.231 billion and $1.094 billion as of September 30, 2018 and 2017, respectively.

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