Basis of Presentation (Details) person in Thousands, detainee in Thousands, bed in Thousands	Mar. 31, 2018 person facility detainee bed
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of beds | bed	96
Correctional, detention and residential treatment facilities including projects under development | facility	141
Provision of monitoring services tracking offenders (more than 192,000) | person	192
Provision of monitoring services tracking offenders using technology products (in detainees) | detainee	100