Real Estate Transactions - Additional Information (Detail) $ in Thousands			3 Months Ended
	May 06, 2019 USD ($) ft²	Feb. 20, 2019 USD ($)	Mar. 31, 2019 USD ($) Facility Bed	Mar. 31, 2018 USD ($)	Jan. 24, 2018 Bed
Facility Activations Developments And Closures [Line Items]
Operating Expense			$ 345,832	$ 319,151
Idle Facilities
Facility Activations Developments And Closures [Line Items]
Number of facility | Facility			8
Operating Expense			$ 3,100	$ 3,500
Idled Non-Core Facilities
Facility Activations Developments And Closures [Line Items]
Number of beds at the facility | Bed			440
Number of facility | Facility			2
Net Carrying Value			$ 3,700
Kansas Department Of Corrections
Facility Activations Developments And Closures [Line Items]
Lease term					20 years
Number of beds at the facility | Bed					2,432
Construction of new facility commencement description			Construction of the new facility commenced in the first quarter of 2018 and is expected to be completed during the first quarter of 2020.
Construction project capitalized amount			$ 74,400
Subsequent Event | Detroit, Michigan
Facility Activations Developments And Closures [Line Items]
Purchase price of real estate	$ 7,200
Area of Building Acquired | ft²	36,520
Percentage of building leased	100.00%
Operating lease renewal term	6 years
South Raleigh Reentry Center | Raleigh, North Carolina [Member]
Facility Activations Developments And Closures [Line Items]
Purchase price of real estate		$ 900
Purchase price, net tangible assets		$ 900