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Quarterly Results - Additional Information (Detail) - USD ($) | 3 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
After tax reduction per diluted share pursuant to tax cuts and jobs act 2007 |  |  |  |  | $ 30,000,000 |  |  |
After tax reduction per diluted share pursuant to tax cuts and jobs act 2007 |  |  |  |  | $ 0.32 |  |  |
River Point Behavioral Health | Located in U.K. |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Unfavorable after tax reduction pursuant to tax cuts and jobs act 2007 |  |  |  |  | $ 11,300,000 |  |  |
Tax reduction per diluted share pursuant to tax cuts and jobs act 2007 |  |  |  |  | $ 0.12 |  |  |
River Point Behavioral Health | Located in Puerto Rico |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Unfavorable after tax reduction pursuant to tax cuts and jobs act 2007 |  |  |  |  | $ 11,300,000 |  |  |
Tax reduction per diluted share pursuant to tax cuts and jobs act 2007 |  |  |  |  | $ 0.12 |  |  |
EHR Applications |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Unfavorable pre-tax reduction |  |  |  |  | $ 3,600,000 | $ 4,200,000 | $ 6,400,000 | $ 8,100,000
Unfavorable after-tax reduction |  |  |  |  | $ 2,300,000 | $ 2,600,000 | $ 4,000,000 | $ 5,100,000
Tax reduction per diluted share |  |  |  |  | $ 0.03 | $ 0.03 | $ 0.04 | $ 0.05
ASU 2016-09 |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Favorable after tax impact |  |  |  | $ 1,600,000 | $ 13,500,000 | $ 487,000 | $ 1,400,000 | $ 6,800,000
Favorable after tax impact per share diluted |  |  |  | $ 0.02 | $ 0.14 | $ 0.01 | $ 0.01 | $ 0.07
DOJ Reserve |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Unfavorable pre-tax reduction | $ 31,900,000 | $ 48,000,000 | $ 9,500,000 | $ 13,000,000 |  |  |  |
Unfavorable after-tax reduction | $ 24,500,000 | $ 36,600,000 | $ 7,200,000 | $ 9,900,000 |  |  |  |
Tax reduction per diluted share | $ 0.26 | $ 0.39 | $ 0.08 | $ 0.11 |  |  |  |
Provision for Intangible Asset Impairment |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Unfavorable pre-tax reduction | $ 49,300,000 |  |  |  |  |  |  |
Unfavorable after-tax reduction | $ 37,700,000 |  |  |  |  |  |  |
Tax reduction per diluted share | $ 0.41 |  |  |  |  |  |  |

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