Business Combination Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 01, 2018	Dec. 31, 2017	Nov. 01, 2017	Apr. 08, 2016
Business Acquisition [Line Items]
Goodwill	$ 48,169		$ 40,927
Correctional Management, Inc
Business Acquisition [Line Items]
Tangible current assets and liabilities, net					$ 1,000
Property and equipment					29,200
Intangible assets					1,500
Total identifiable assets					31,700
Goodwill					3,300
Total consideration					$ 35,000
Time to Change, Inc. and Center Point, Inc.
Business Acquisition [Line Items]
Tangible current assets and liabilities, net				$ 900
Property and equipment				19,700
Intangible assets				3,900
Total identifiable assets				24,500
Goodwill				2,800
Total consideration				$ 27,300
Rocky Mountain Offender Management Systems LLC and Recovery Monitoring Solutions Corporation
Business Acquisition [Line Items]
Property and equipment		$ 6,100
Intangible assets		12,400
Tangible assets and liabilities, net		(2,800)
Total identifiable assets		15,700
Goodwill		7,200
Total consideration		$ 22,900