Business Combination Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Jun. 10, 2016	Apr. 08, 2016	Dec. 31, 2015	Aug. 27, 2015
Business Acquisition [Line Items]
Property and equipment		$ 7,400			$ 13,400
Goodwill	$ 38,386			$ 35,557
Avalon Correctional Services, Inc
Business Acquisition [Line Items]
Property and equipment				119,200
Intangible assets				18,500
Total identifiable assets				137,700
Goodwill				19,800
Total consideration				$ 157,500
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