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Quarterly Results - Additional Information (Detail) - USD ($) | 3 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016
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 |  |  |  |  |  |  |
ASU 2016-09 |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Favorable after tax impact | $ 13,500,000 | $ 487,000 | $ 1,400,000 | $ 6,800,000 |  |  |  |
Favorable after tax impact per share diluted | $ 0.14 | $ 0.01 | $ 0.01 | $ 0.07 |  |  |  |
EHR Applications |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Unfavorable pre-tax reduction | $ 3,600,000 | $ 4,200,000 | $ 6,400,000 | $ 8,100,000 | $ 2,800,000 | $ 8,500,000 | $ 8,700,000 | $ 8,300,000
Unfavorable after-tax reduction | $ 2,300,000 | $ 2,600,000 | $ 4,000,000 | $ 5,100,000 | $ 1,800,000 | $ 5,300,000 | $ 5,500,000 | $ 5,200,000
Tax reduction per diluted share | $ 0.03 | $ 0.03 | $ 0.04 | $ 0.05 | $ 0.02 | $ 0.06 | $ 0.05 | $ 0.05

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