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Segment Reporting (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross inpatient revenues |  |  |  |  |  |  |  |  | $ 24,304,341 | $ 21,632,855 | $ 19,763,315
Gross outpatient revenues |  |  |  |  |  |  |  |  | 10,460,630 | 8,965,578 | 7,613,277
Total net revenues | $ 2,315,239 | $ 2,227,655 | $ 2,275,204 | $ 2,225,353 | $ 2,176,291 | $ 2,038,717 | $ 2,051,766 | $ 1,938,314 | 9,043,451 | 8,205,088 | 7,367,873
Income (loss) before allocation of corporate overhead and income taxes |  |  |  |  |  |  |  |  | 1,145,901 | 929,667 | 869,332
Allocation of corporate overhead |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) after allocation of corporate overhead and before income taxes |  |  |  |  |  |  |  |  | 1,145,901 | 929,667 | 869,332
Total assets | 9,634,113 |  |  |  | 8,974,443 |  |  |  | 9,634,113 | 8,974,443 | 8,311,723
Acute Care Hospital Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross inpatient revenues |  |  |  |  |  |  |  |  | 16,847,944 | 14,943,102 | 13,469,269
Gross outpatient revenues |  |  |  |  |  |  |  |  | 9,604,952 | 8,147,031 | 6,828,307
Total net revenues |  |  |  |  |  |  |  |  | 4,632,564 | 4,178,103 | 3,602,874
Income (loss) before allocation of corporate overhead and income taxes |  |  |  |  |  |  |  |  | 519,630 | 465,328 | 342,191
Allocation of corporate overhead |  |  |  |  |  |  |  |  | (197,699) | (178,781) | (184,444)
Income (loss) after allocation of corporate overhead and before income taxes |  |  |  |  |  |  |  |  | 321,931 | 286,547 | 157,747
Total assets | 3,413,879 |  |  |  | 3,362,870 |  |  |  | 3,413,879 | 3,362,870 | 3,125,626
Behavioral Health Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross inpatient revenues |  |  |  |  |  |  |  |  | 7,456,397 | 6,689,753 | 6,294,046
Gross outpatient revenues |  |  |  |  |  |  |  |  | 839,884 | 784,309 | 744,510
Total net revenues |  |  |  |  |  |  |  |  | 4,400,335 | 4,012,216 | 3,725,513
Income (loss) before allocation of corporate overhead and income taxes |  |  |  |  |  |  |  |  | 1,021,823 | 944,068 | 895,869
Allocation of corporate overhead |  |  |  |  |  |  |  |  | (117,203) | (98,811) | (89,447)
Income (loss) after allocation of corporate overhead and before income taxes |  |  |  |  |  |  |  |  | 904,620 | 845,257 | 806,422
Total assets | 5,867,088 |  |  |  | 5,286,960 |  |  |  | 5,867,088 | 5,286,960 | 4,966,182
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross outpatient revenues |  |  |  |  |  |  |  |  | 15,794 | 34,238 | 40,460
Total net revenues |  |  |  |  |  |  |  |  | 10,552 | 14,769 | 39,486
Income (loss) before allocation of corporate overhead and income taxes |  |  |  |  |  |  |  |  | (395,552) | (479,729) | (368,728)
Allocation of corporate overhead |  |  |  |  |  |  |  |  | 314,902 | 277,592 | 273,891
Income (loss) after allocation of corporate overhead and before income taxes |  |  |  |  |  |  |  |  | (80,650) | (202,137) | (94,837)
Total assets | $ 353,146 |  |  |  | $ 324,613 |  |  |  | $ 353,146 | $ 324,613 | $ 219,915

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