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Subsequent Events - Additional Information (Detail) | Nov. 01, 2017 USD ($) Facility Bed | Oct. 13, 2017 USD ($) | Sep. 15, 2017 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
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Subsequent Event [Line Items] |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  | $ 8,290,000 | $ 9,831,000
Aggregate purchase price paid |  |  | $ 8,700,000 |  |  |
Forecast | 4.75% Senior Notes Due October 15, 2027 |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  | $ 4,100,000 |  |
Revolving Credit Facility | $900.0 Million Revolving Credit Facility |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Line of credit facility maximum borrowing capacity |  |  |  |  | $ 900,000,000 | $ 900,000,000
Subsequent Event | Time to Change, Inc. |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Aggregate purchase price paid | $ 13,200,000 |  |  |  |  |
Additional contingent consideration current | $ 9,000,000 |  |  |  |  |
Number of facility | Facility | 3 |  |  |  |  |
Number of beds at the facility | Bed | 422 |  |  |  |  |
Subsequent Event | 4.75% Senior Notes Due October 15, 2027 |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Aggregate principal amount |  | $ 250,000,000 |  |  |  |
Stated interest rate |  | 4.75% |  |  |  |
Debt maturity date |  | Oct. 15, 2027 |  |  |  |

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