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Investment in Affiliate - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investments in and Advances to Affiliates [Line Items]      
Duration of prison management contract with an agency of the United Kingdom government 25 years    
Working capital loan to APM $ 2,900,000    
Equity earnings (losses) of joint venture $ (41,000) $ (126,000) $ 720,000
Agecroft Prison Management Ltd      
Investments in and Advances to Affiliates [Line Items]      
Variable interest entity, ownership percentage 50.00%    
Other assets      
Investments in and Advances to Affiliates [Line Items]      
Equity in net earnings of Affiliate $ 500,000