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Schedule of Disaggregates Revenue by Major Source (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 2,681,353 | $ 2,612,356 | $ 5,368,869 | $ 5,225,214
Percentage of Net Revenue |  | 100.00% | 100.00% | 100.00% | 100.00%
Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 452,114 | $ 433,961 | $ 950,398 | $ 908,543
Percentage of Net Revenue |  | 17.00% | 17.00% | 18.00% | 17.00%
Managed Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 225,239 | $ 193,223 | $ 459,332 | $ 382,255
Percentage of Net Revenue |  | 8.00% | 7.00% | 9.00% | 7.00%
Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 285,191 | $ 303,996 | $ 572,306 | $ 581,807
Percentage of Net Revenue |  | 11.00% | 12.00% | 11.00% | 11.00%
Managed Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 385,622 | $ 343,442 | $ 746,337 | $ 688,382
Percentage of Net Revenue |  | 14.00% | 13.00% | 14.00% | 13.00%
Managed Care (HMO and PPOs) |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 873,678 | $ 834,715 | $ 1,747,718 | $ 1,681,661
Percentage of Net Revenue |  | 33.00% | 32.00% | 33.00% | 32.00%
UK Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 119,457 | $ 106,390 | $ 234,198 | $ 206,412
Percentage of Net Revenue |  | 4.00% | 4.00% | 4.00% | 4.00%
Other Patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 185,342 | $ 215,037 | $ 349,217 | $ 412,058
Percentage of Net Revenue |  | 7.00% | 8.00% | 7.00% | 8.00%
Other Non-patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 154,710 | $ 181,592 | $ 309,363 | $ 364,096
Percentage of Net Revenue |  | 6.00% | 7.00% | 6.00% | 7.00%
Acute Care |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 1,403,991 | $ 1,366,457 | $ 2,849,623 | $ 2,756,004
Percentage of Net Revenue |  | 100.00% | 100.00% | 100.00% | 100.00%
Acute Care | Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 305,471 | $ 286,524 | $ 661,228 | $ 614,461
Percentage of Net Revenue |  | 22.00% | 21.00% | 23.00% | 22.00%
Acute Care | Managed Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 174,196 | $ 150,510 | $ 363,294 | $ 302,868
Percentage of Net Revenue |  | 12.00% | 11.00% | 13.00% | 11.00%
Acute Care | Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 109,225 | $ 121,318 | $ 219,004 | $ 218,180
Percentage of Net Revenue |  | 8.00% | 9.00% | 8.00% | 8.00%
Acute Care | Managed Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 138,346 | $ 120,223 | $ 268,285 | $ 247,518
Percentage of Net Revenue |  | 10.00% | 9.00% | 9.00% | 9.00%
Acute Care | Managed Care (HMO and PPOs) |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 512,631 | $ 474,876 | $ 1,028,609 | $ 966,484
Percentage of Net Revenue |  | 37.00% | 35.00% | 36.00% | 35.00%
Acute Care | 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 | Other Patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 63,950 | $ 94,826 | $ 110,840 | $ 167,049
Percentage of Net Revenue |  | 5.00% | 7.00% | 4.00% | 6.00%
Acute Care | Other Non-patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 100,172 | $ 118,180 | $ 198,363 | $ 239,444
Percentage of Net Revenue |  | 7.00% | 9.00% | 7.00% | 9.00%
Behavioral Health |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues | [1] | $ 1,274,083 | $ 1,242,561 | $ 2,512,079 | $ 2,460,683
Percentage of Net Revenue |  | 100.00% | 100.00% | 100.00% | 100.00%
Behavioral Health | Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 146,643 | $ 147,437 | $ 289,170 | $ 294,082
Percentage of Net Revenue |  | 12.00% | 12.00% | 12.00% | 12.00%
Behavioral Health | Managed Medicare |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 51,043 | $ 42,713 | $ 96,038 | $ 79,387
Percentage of Net Revenue |  | 4.00% | 3.00% | 4.00% | 3.00%
Behavioral Health | Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 175,966 | $ 182,678 | $ 353,302 | $ 363,627
Percentage of Net Revenue |  | 14.00% | 15.00% | 14.00% | 15.00%
Behavioral Health | Managed Medicaid |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 247,276 | $ 223,219 | $ 478,052 | $ 440,864
Percentage of Net Revenue |  | 19.00% | 18.00% | 19.00% | 18.00%
Behavioral Health | Managed Care (HMO and PPOs) |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 361,047 | $ 359,839 | $ 719,109 | $ 715,177
Percentage of Net Revenue |  | 28.00% | 29.00% | 29.00% | 29.00%
Behavioral Health | UK Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 119,457 | $ 106,390 | $ 234,198 | $ 206,412
Percentage of Net Revenue |  | 9.00% | 9.00% | 9.00% | 8.00%
Behavioral Health | Other Patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 121,392 | $ 120,211 | $ 238,377 | $ 245,009
Percentage of Net Revenue |  | 10.00% | 10.00% | 9.00% | 10.00%
Behavioral Health | Other Non-patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 51,259 | $ 60,074 | $ 103,833 | $ 116,125
Percentage of Net Revenue |  | 4.00% | 5.00% | 4.00% | 5.00%
Other |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 3,279 | $ 3,338 | $ 7,167 | $ 8,527
Other | Other Non-patient Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 3,279 | $ 3,338 | $ 7,167 | $ 8,527
[1] | Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $119 million and $106 million for the three-month periods ended June 30, 2018 and 2017, respectively, and approximately $234 million and $206 million for the six-month periods ended June 30, 2018 and 2017 respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.123 billion and $1.028 billion as of June 30, 2018 and 2017, respectively.

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