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Schedule of Financial Instruments Having Difference Between Carrying Amount and Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]    
Note receivable from Agecroft Prison Management, LTD, Carrying Amount $ 2,788 $ 2,887
Debt, Carrying Amount (1,875,422) (1,814,795)
Note receivable from Agecroft Prison Management, LTD, Fair Value 3,800 4,037
Debt, Fair Value $ (1,839,829) $ (1,744,045)