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Quarterly Results - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014
Implementation of EHR applications |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Unfavorable pre-tax reduction |  | $ 8.0 | $ 6.9 | $ 8.3 |  | $ 7.9 | $ 7.1 | $ 8.9
Unfavorable after-tax reduction |  | $ 5.0 | $ 4.4 | $ 5.3 |  | $ 4.5 | $ 3.9 | $ 4.9
Tax reduction per diluted share |  | $ 0.05 | $ 0.05 | $ 0.05 |  | $ 0.04 | $ 0.04 | $ 0.05
EHR applications |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Tax reduction per diluted share | $ 0.03 |  |  |  | $ 0.08 |  |  |
Favorable pre-tax reduction | $ 4.9 |  |  |  | $ 13.8 |  |  |
Favorable after-tax reduction | $ 3.1 |  |  |  | $ 8.6 |  |  |
Resulting from the gain realized on the sale of a non-operating investment |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Tax reduction per diluted share |  |  |  |  |  |  |  | $ 0.07
Favorable pre-tax reduction |  |  |  |  |  |  |  | $ 10.1
Favorable after-tax reduction |  |  |  |  |  |  |  | $ 6.3
Related to extinguishment of debt from the early redemption of previously outstanding $250 million 7.00% senior unsecured notes and the repayment of $550 million of previously outstanding Term Loan B facility |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Unfavorable pre-tax reduction |  |  |  |  |  | $ 36.2 |  |
Unfavorable after-tax reduction |  |  |  |  |  | $ 22.7 |  |
Tax reduction per diluted share |  |  |  |  |  | $ 0.23 |  |
Incurred in connection with the previously disclosed $65 million settlement of the Garden City matter |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Unfavorable pre-tax reduction |  |  |  |  |  | $ 44.0 |  |
Unfavorable after-tax reduction |  |  |  |  |  | $ 27.6 |  |
Tax reduction per diluted share |  |  |  |  |  | $ 0.27 |  |
Professional and general liability self-insurance reserves |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Tax reduction per diluted share |  |  |  |  | $ 0.12 |  |  |
Favorable pre-tax reduction |  |  |  |  | $ 19.7 |  |  |
Favorable after-tax reduction |  |  |  |  | $ 11.7 |  |  |

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