Commitments and Contingencies - Additional Information (Details) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 19, 2017 Claim	Sep. 30, 2020 USD ($) bed facility Installment
Commitments and Contingencies [Line Items]
Estimate of possible loss		$ 19.4
Number of deferred payment installment related to payroll taxes | Installment		2
Deferred payment related to payroll taxes amount		$ 27.6
Estimated construction existing active capital projects cost		62.0
Cost already spent on existing active capital projects		42.0
Remaining capital required for existing active capital projects		$ 20.0
Number of vacant beds at idle facilities marketed to potential customers | bed		2,100
Number of marketed idle facilities | facility		4
Property and Equipment, Net
Commitments and Contingencies [Line Items]
Carrying values of idle facilities marketed to potential customers		$ 50.5
Pending Litigation | Immigration Detainees Against Company
Commitments and Contingencies [Line Items]
Number of claims filed | Claim	3
WASHINGTON | Pending Litigation | Immigration Detainees Against Company
Commitments and Contingencies [Line Items]
Number of claims filed | Claim	2
CALIFORNIA | Pending Litigation | Immigration Detainees Against Company
Commitments and Contingencies [Line Items]
Number of claims filed | Claim	1