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Property and Equipment - Additional information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 USD ($) | Sep. 30, 2019 Bed | Mar. 31, 2019 Bed | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Loss on impairment | $ 54,400 |  |  | $ 337,900 | $ 54,386 | $ 337,889
Assets held for sale | 31,100 |  |  | $ 17,000 | $ 31,100 | $ 17,000
U.S. Facilities [Member] |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Loss on impairment | 27,200 |  |  |  |  |
U.K. Facilities [Member] |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Loss on impairment | $ 27,200 |  |  |  |  |
Residential Treatment Centers [Member] | Albuquerque, New Mexico [Member] |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Number of beds in facilities closed | Bed |  |  | 168 |  |  |
Residential Treatment Centers [Member] | Butte, Montana [Member] |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Number of beds in facilities closed | Bed |  | 108 |  |  |  |

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