Contract Receivable (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) bed	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract receivable	$ 396,647	$ 366,697
Ravenhall
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract receivable	$ 402,900
Loan issued, interest rate	8.97%
Department of Justice, State of Victoria | Facility Constructions and Design
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of beds in detention facility | bed	1,300
Facility operation contract term	25 years