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Schedule of Disaggregates Revenue by Major Source (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 2,687,516 | $ 2,612,858
Percentage of Net Revenue | 100.00% | 100.00%
Medicare |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 485,245 | $ 463,030
Percentage of Net Revenue | 18.00% | 18.00%
Managed Medicare |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 221,952 | $ 180,721
Percentage of Net Revenue | 8.00% | 7.00%
Medicaid |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 283,302 | $ 273,606
Percentage of Net Revenue | 11.00% | 10.00%
Managed Medicaid |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 342,053 | $ 332,197
Percentage of Net Revenue | 13.00% | 13.00%
Managed Care (HMO and PPOs) |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 855,842 | $ 832,604
Percentage of Net Revenue | 32.00% | 32.00%
UK Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 114,741 | $ 100,022
Percentage of Net Revenue | 4.00% | 4.00%
Other Patient Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 229,555 | $ 248,172
Percentage of Net Revenue | 9.00% | 9.00%
Other Non-patient Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 154,826 | $ 182,506
Percentage of Net Revenue | 6.00% | 7.00%
Acute Care |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 1,445,632 | $ 1,389,547
Percentage of Net Revenue | 100.00% | 100.00%
Acute Care | Medicare |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 342,718 | $ 316,385
Percentage of Net Revenue | 24.00% | 23.00%
Acute Care | Managed Medicare |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 176,957 | $ 144,047
Percentage of Net Revenue | 12.00% | 10.00%
Acute Care | Medicaid |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 105,966 | $ 92,657
Percentage of Net Revenue | 7.00% | 7.00%
Acute Care | Managed Medicaid |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 111,277 | $ 114,552
Percentage of Net Revenue | 8.00% | 8.00%
Acute Care | Managed Care (HMO and PPOs) |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 497,780 | $ 477,266
Percentage of Net Revenue | 34.00% | 34.00%
Acute Care | UK Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 0 | $ 0
Percentage of Net Revenue | 0.00% | 0.00%
Acute Care | Other Patient Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 112,570 | $ 123,374
Percentage of Net Revenue | 8.00% | 9.00%
Acute Care | Other Non-patient Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 98,364 | $ 121,266
Percentage of Net Revenue | 7.00% | 9.00%
Other |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 3,888 | $ 5,189
Other | Other Non-patient Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | 3,888 | 5,189
Behavioral Health |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 1,237,996 | $ 1,218,122
Percentage of Net Revenue | 100.00% | 100.00%
Behavioral Health | Medicare |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 142,527 | $ 146,645
Percentage of Net Revenue | 12.00% | 12.00%
Behavioral Health | Managed Medicare |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 44,995 | $ 36,674
Percentage of Net Revenue | 4.00% | 3.00%
Behavioral Health | Medicaid |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 177,336 | $ 180,949
Percentage of Net Revenue | 14.00% | 15.00%
Behavioral Health | Managed Medicaid |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 230,776 | $ 217,645
Percentage of Net Revenue | 19.00% | 18.00%
Behavioral Health | Managed Care (HMO and PPOs) |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 358,062 | $ 355,338
Percentage of Net Revenue | 29.00% | 29.00%
Behavioral Health | UK Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 114,741 | $ 100,022
Percentage of Net Revenue | 9.00% | 8.00%
Behavioral Health | Other Patient Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 116,985 | $ 124,798
Percentage of Net Revenue | 9.00% | 10.00%
Behavioral Health | Other Non-patient Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Net Revenue | $ 52,574 | $ 56,051
Percentage of Net Revenue | 4.00% | 5.00%

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