Discontinued Operations - Additional Information (Detail)	Apr. 30, 2010 Gadsden Correctional Institution Facility Facility	Apr. 30, 2010 Hernando County Jail Facility Facility	Jan. 31, 2012 Delta Correctional Facility Facility	Nov. 30, 2011 Delta Correctional Facility Facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Housing capacity of terminated facility	1,520	876		1,172
Number of inmates being transferred from facility			900