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Discontinued Operations - Additional Information (Detail) (Delta Correctional Facility)
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Jan. 31, 2012
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Nov. 30, 2011
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Delta Correctional Facility
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | ||
| Housing capacity of terminated facility, in beds | 1,172 | |
| Number of inmates being transferred from facility | 900 |